The Development Of Textures And Microstructures In Alpha Beta Titanium Alloys

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The Development of Textures and Microstructures in Alpha/beta Titanium Alloys

Author : Dhriti Bhattacharyya
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (565 download)

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Book Synopsis The Development of Textures and Microstructures in Alpha/beta Titanium Alloys by : Dhriti Bhattacharyya

Download or read book The Development of Textures and Microstructures in Alpha/beta Titanium Alloys written by Dhriti Bhattacharyya and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The relationship between the texture and the microstructure of both beta processed and alpha/beta processed Ti alloys has been examined in this study. In the beta-processed microstructures, it has been shown that two sets of alpha colonies sharing a common 0001 plane and rotated by 10.5° from each other may have growth directions which have very large angles of about 80.7° between them. Moreover, it was observed that alpha laths growing from certain prior beta grain boundaries sometimes shared common basal planes. In some special cases, the alpha laths growing into two different prior beta grains from the grain boundary between them had almost exactly the same orientation, although they had vastly different growth directions. Additionally, there were some cases in which alpha laths growing into different prior beta grains not only had the same crystallographic orientation, but also had the same growth direction. Scanning Electron Microscopy (SEM), Orientation Imaging Microscopy (OIM) and Transmission Electron Microscopy (TEM) have been used to investigate these phenomena and the existing theories of growth directions have been used in conjunction with the results obtained to explain them. In alpha/beta-processed alloys, the phenomenon of globularization of alpha laths breaks down the beta-processed microstructure and modifies the texture of these alloys. Samples of Ti-6Al-4V having colony and basketweave microstructures were hot deformed in the high alpha/beta temperature range and their microstructure and microtexture were examined by the use of SEM and OIM. It is shown that the samples which had a colony microstructure had greater "clustering" of grains with similar orientations than those having a basketweave microstructure. The mode of transformation on heating from the alpha to the beta phase was investigated by measuring the texture of both phases at different temperatures, in situ, using the HIPPO instrument at the Los Alamos Neutron Science Center. A comparison of the pole figures for both phases has allowed an insight into the mode of transformation of the alpha to the beta phase, and it appears that the beta phase forms by the growth of the preexisting beta, and not by fresh nucleation of beta in the alpha phase.

Modeling of Texture Evolution During Hot Forging of Alpha/Beta Titanium Alloys (Preprint).

Author :
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Modeling of Texture Evolution During Hot Forging of Alpha/Beta Titanium Alloys (Preprint). by :

Download or read book Modeling of Texture Evolution During Hot Forging of Alpha/Beta Titanium Alloys (Preprint). written by and published by . This book was released on 2007 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Texture development during the subtransus hot forging of alpha/beta titanium alloys with an equiaxed-alpha microstructure was modeled using the Los Alamos Polycrystalline Plasticity (LApp) code and 111 pencil-glide polycrystalline plasticity code coupled with the finite-element-method (FEM) program DEFORM. The methodology treated the partitioning of the imposed strain between the alpha and beta phases, and thus enabled the prediction of the distinct deformation textures developed in the primary alpha and beta matrix during hot working. Two variant selection rules in conjunction with the beta deformation texture were also examined to establish a method for predicting the transformation texture of secondary alpha developed as a result of beta decomposition during cool-down following forging or heat treatment. The approach was validated via an industrial-scale trail comprising hot pancake forging of Ti-6Al-4V.

The Deformation and Texture Evolution of Ti-10V-2Fe-3Al

Author : Juan Zhao
Publisher :
ISBN 13 :
Total Pages : 398 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis The Deformation and Texture Evolution of Ti-10V-2Fe-3Al by : Juan Zhao

Download or read book The Deformation and Texture Evolution of Ti-10V-2Fe-3Al written by Juan Zhao and published by . This book was released on 2015 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beta titanium alloys form one of the most versatile classes of materials with respect to processing, microstructure, and mechanical properties. Owing to their body centered cubic structure, [beta] titanium alloys offer an attractive alternative to the [alpha]+[beta] and [alpha] alloys as they usually possess higher specific strengths, better heat treat ability, deep hardening properties, and lower processing temperatures. However, beta titanium alloys are very sensitive to deformation parameters and may produce quite different microstructures and further various mechanical properties. It is necessary to explore the effect of deformation parameters on the microstructure evolution, including testing temperature, strain rate and strain.Texture introduced by deformation may produce a strong anisotropy of mechanical and other properties, and can also lead to the localization of these properties. Therefore, in order to make use of the advantages of [beta] titanium alloys, we must also understand the evolution of texture.The aim of this project is to reveal the deformation mechanisms and the evolution of texture during hot deformation in [beta] titanium based on compression tests, optical microscopy (OM), scanning electron microscopy (SEM) and texture evolution by Electron backscattered diffraction (EBSD) and x-ray texture observation.The microstructure, texture and mechanical response of forged Ti-10V-2Fe-3Al plates were investigated. Forged plates of as-received Ti-10V-2Fe-3Al alloy features fine [alpha] phase in large [beta] grains. Yield locus tests were performed which confirmed that [beta] phase {001} 110 texture resulted in lower mechanical anisotropy in the forged plate. The relationship between [alpha] phase and [beta] matrix texture was characterized by EBSD. The Burgers relationship is observed between these two phases in the as-received state, and this is preserved from the forging process and following 760 °C heat treatment. After further heat treatment at 820 °C, both [beta] phase and [alpha] phase form recrystallization textures and the Burgers relationship is no longer obvious. Furthermore, through thickness texture inhomogeneity was studied in the as-received plate. A rotated cube texture is widely spread at the surface, and more intense at quarter thickness and center. At the surface there is a tendency to form the {111} 112 recrystallization texture while in the quarter thickness and center, the restoration mode is mainly recovery.Following solution treatment in single [beta] phase field, deformation in [alpha]+[beta] phase field was performed, which presented a considerable effect on [alpha] phase morphologies. The microstructure of [alpha] phase is basically an evolution of lamellar [alpha] breaking up into shorter lamellar and coarsening into globular morphologies. Dynamic recovery is the main restoration mechanism for [beta] phase. The dominant orientations of beta phase include a strong rotated cube texture and weak 111 orientations parallel to compression direction. The orientation relationship between [alpha] phase and [beta] matrix follows the Burgers relationship and deformation in [alpha]+[beta] phase field does not destroy this orientation relationship.Deformation at above [beta] transus temperature leads to strong 001 and weak 111 textures. With increasing temperature and decreasing strain rate, the 001 texture gets strengthened gradually and 111 orientations show weakening tendency. The volume fractions of dynamic recrystallization are lower than 10% under all the deformation conditions in the single [beta] phase field, showing the main dynamic restoration mechanism is also dynamic recovery at above [beta] transus temperature tested in this thesis. Moreover, deformation parameters show significant effects on microstructure evolution. At low strain rate, dislocation annihilation and dynamic recovery are very effective, resulting in significantly larger subgrain size and less pancaked original grains. Besides dynamic recovery, continuous dynamic recrystallization by progressive lattice rotation is also observed, which occurs at high strain rate and low temperature. Geometric dynamic recrystallization hardly occurs, as HAGB spacing is much larger than the subgrain size at the highest strain of 0.9. Discontinuous dynamic recrystallization is rarely observed in the sing [beta] phase field in Ti-10V-2Fe-3Al.

Titanium Alloys

Author : Maciej Motyka
Publisher : BoD – Books on Demand
ISBN 13 : 183962552X
Total Pages : 156 pages
Book Rating : 4.8/5 (396 download)

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Book Synopsis Titanium Alloys by : Maciej Motyka

Download or read book Titanium Alloys written by Maciej Motyka and published by BoD – Books on Demand. This book was released on 2019-11-27 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium alloys, due to unique physical and chemical properties (mainly high relative strength combined with very good corrosion resistance), are considered as an important structural metallic material used in hi-tech industries (e.g. aerospace, space technology). This book provides information on new manufacturing and processing methods of single- and two-phase titanium alloys. The eight chapters of this book are distributed over four sections. The first section (Introduction) indicates the main factors determining application areas of titanium and its alloys. The second section (Manufacturing, two chapters) concerns modern production methods for titanium and its alloys. The third section (Thermomechanical and surface treatment, three chapters) covers problems of thermomechanical processing and surface treatment used for single- and two-phase titanium alloys. The fourth section (Machining, two chapters) describes the recent results of high speed machining of Ti-6Al-4V alloy and the possibility of application of sustainable machining for titanium alloys.

COLLABORATIVE RESEARCH AND DEVELOPMENT (CR & D) Delivery Order 0043: Deformation and Texture Development During Hot Working of Titanium

Download COLLABORATIVE RESEARCH AND DEVELOPMENT (CR & D) Delivery Order 0043: Deformation and Texture Development During Hot Working of Titanium PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (713 download)

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Book Synopsis COLLABORATIVE RESEARCH AND DEVELOPMENT (CR & D) Delivery Order 0043: Deformation and Texture Development During Hot Working of Titanium by :

Download or read book COLLABORATIVE RESEARCH AND DEVELOPMENT (CR & D) Delivery Order 0043: Deformation and Texture Development During Hot Working of Titanium written by and published by . This book was released on 2008 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research in support of the Air Force Research Laboratory Materials and Manufacturing Directorate was conducted at Wright-Patterson AFB, Ohio from 3 November 2005 through 31 January 2008. This task developed constitutive models for alpha/beta titanium alloys with colony-alpha microstructure and validated texture prediction models for plate rolling. A method for separating the textures of primary alpha [alpha(sub p] and secondary alpha [alpha(sub s)] in alpha/beta titanium alloys with a duplex microstructure was developed. Utilizing electron backscatter diffraction (EBSD) and energy-dispersive spectroscopy (EDS), the approach relies on the non-uniform partitioning of alloying elements between primary alpha and regions containing secondary-alpha lamellae and residual beta matrix phase. The method was evaluated using samples of Ti-6Al-4V for which vanadium partitions strongly to secondary alpha + beta regions. The technique thus provides a useful tool for quantifying the evolution of deformation texture in the primary alpha and transformation texture in secondary alpha formed via decomposition of the beta matrix following hot working or final heat treatment.

A Coupled EBSD/EDS Method to Determine the Primary- and Secondary-Alpha Textures in Titanium Alloys With Duplex Microstructures (Preprint).

Download A Coupled EBSD/EDS Method to Determine the Primary- and Secondary-Alpha Textures in Titanium Alloys With Duplex Microstructures (Preprint). PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis A Coupled EBSD/EDS Method to Determine the Primary- and Secondary-Alpha Textures in Titanium Alloys With Duplex Microstructures (Preprint). by :

Download or read book A Coupled EBSD/EDS Method to Determine the Primary- and Secondary-Alpha Textures in Titanium Alloys With Duplex Microstructures (Preprint). written by and published by . This book was released on 2007 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for separating the textures of primary alpha and secondary alpha in alpha/beta titanium alloys with a duplex microstructure was developed. Utilizing electron backscatter diffraction (EBSD) and energy-dispersive spectroscopy (EDS), the approach relies on the non-uniform partitioning of alloying elements between primary alpha and regions containing secondary-alpha lamellae and residual beta matrix phase. The method was evaluated using samples of Ti-6Al-4V for which vanadium partitions strongly to secondary alpha + beta regions. The technique thus provides a useful tool for quantifying the evolution of deformation texture in the primary alpha and transformation texture in secondary alpha formed via decomposition of the beta matrix following hot working or final heat treatment.

Microstructure Evolution and Microstructure/mechanical Properties Relationships in [alpha]+[beta] Titanium Alloys

Author : Eunha Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (65 download)

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Book Synopsis Microstructure Evolution and Microstructure/mechanical Properties Relationships in [alpha]+[beta] Titanium Alloys by : Eunha Lee

Download or read book Microstructure Evolution and Microstructure/mechanical Properties Relationships in [alpha]+[beta] Titanium Alloys written by Eunha Lee and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this study, the microstructural evolution of Timetal 550 was investigated. Timetal 550 showed two types of phase transformations (martensitic and nucleation and growth) depending on the cooling rate from the [beta] region. The [alpha] phase initially precipitated at the prior [beta] grain boundaries, and it had a Burgers OR with one of the adjacent grains. It was found that colonies could grow, even in the fast-cooled Timetal 550 sample, from the grain boundary [alpha] into the prior [beta] grain with which it exhibited the Burgers OR. Three orientation relationships were also found between [alpha] laths in the basketweave microstructure. Microhardness testing demonstrated that fast-cooled Timetal 550 samples with basketweave microstructure were harder than slowly-cooled samples with colony microstructure. Orientation-dependent deformation was found in the colony microstructure. Specically, when the surface normal is perpendicular to the [0001] of [alpha], the material deforms easily in the direction perpendicular to the [0001] of [alpha]. Fuzzy logic and Bayesian neural network models were developed to predict the room temperature tensile properties of Timetal 550. This involved the development of a database relating microstructural features to mechanical properties. A Gleeble 3800 thermal-mechanical simulator was used to develop various microstructures. Microstructural features of tensile-tested samples were quantified using stereological procedures. The quantified microstructural features and the tensile properties were used as inputs and outputs, respectively, for modeling the relationships between them. The individual influence of five microstructural features on tensile properties was determined using the established models. The microstructural features having the greatest impact on UTS and YS were the thickness of [alpha] laths and the width of grain boundary [alpha] layer, and the microstructural features having the greatest impact on elongation were the thickness of [alpha] laths and the prior [beta] grain size. Nanoindentation testing found that the hardness of the individual grains was related to their orientations. The hardness values were highest near the [0001] stress axis, and they decreased as the stress axis deviated from [0001] orientation. Dislocation analyses indicated that the deformation in individual grains conformed to the Schmid factor analysis where slip primarily occurs on those slip systems where RSS (SF) values are highest.

Mechanism of Beta-Grain Growth in Alpha/Beta Titanium Alloys During Continuous, Rapid Heating

Author :
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (946 download)

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Book Synopsis Mechanism of Beta-Grain Growth in Alpha/Beta Titanium Alloys During Continuous, Rapid Heating by :

Download or read book Mechanism of Beta-Grain Growth in Alpha/Beta Titanium Alloys During Continuous, Rapid Heating written by and published by . This book was released on 2001 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid Heat Treatment (RHT) of commercial titanium alloys is a promising novel technology ensuring a high level of mechanical properties as well as high cost efficiency of processing. One of the significant advantages of RHT is related to the possibility of employing heating to temperatures in the single-phase beta field. By this means, the technique can be used to obtain fully lamellar intragrain microstructures favorable for high creep resistance and fracture toughness with relatively small or moderate size beta-grains. Such microstructures give rise to good tensile ductility and fatigue properties, comparable to those of equiaxed or bimodal microstructures. Therefore, fully lamellar microstructures with a controlled beta grain size of around 100 micrometers are a feasible way to balance the tensile, fatigue, and creep properties of titanium alloys. With direct resistance heating, these microstructures and the corresponding properties can be produced throughout the part uniformly. With induction heating, gradient type microstructures can be produced in which the properties of surface and core volumes of the heat-treated part are selectively controlled depending on the intended service application. In either case, an understanding of beta grain growth behavior during continuous, rapid heating is the key point. Thus, the goal of this investigation was to establish the temperature dependence of beta-grain size and its dependence on crystallographic texture for the alpha/beta alloy Ti-6A1-4V. The principal variables to be investigated include processing history, heating rate, and method of rapid heating (direct resistance or induction) in order to provide an explanation of beta-grain growth mechanism during continuous rapid heating. As a final output of this effort, practical recommendations for choosing RHT parameters to ensure optimized balance of mechanical properties will be developed.

Investigation of the Effect of Microstructure and Texture on the Fatigue Properties and Deformation Modes of an Alpha + Beta Titanium Alloy, Ti-6Al-2Nb-1Ta-0.8Mo

Download Investigation of the Effect of Microstructure and Texture on the Fatigue Properties and Deformation Modes of an Alpha + Beta Titanium Alloy, Ti-6Al-2Nb-1Ta-0.8Mo PDF Online Free

Author : Donald Shengduen Shih
Publisher :
ISBN 13 :
Total Pages : 302 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Investigation of the Effect of Microstructure and Texture on the Fatigue Properties and Deformation Modes of an Alpha + Beta Titanium Alloy, Ti-6Al-2Nb-1Ta-0.8Mo by : Donald Shengduen Shih

Download or read book Investigation of the Effect of Microstructure and Texture on the Fatigue Properties and Deformation Modes of an Alpha + Beta Titanium Alloy, Ti-6Al-2Nb-1Ta-0.8Mo written by Donald Shengduen Shih and published by . This book was released on 1983 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Microplasticity

Author : Charles J. McMahon
Publisher :
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.:/5 (359 download)

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Book Synopsis Microplasticity by : Charles J. McMahon

Download or read book Microplasticity written by Charles J. McMahon and published by . This book was released on 1968 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling of Mechanical Properties in Alpha/beta-Titanium Alloys

Author : Sujoy Kumar Kar
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (622 download)

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Book Synopsis Modeling of Mechanical Properties in Alpha/beta-Titanium Alloys by : Sujoy Kumar Kar

Download or read book Modeling of Mechanical Properties in Alpha/beta-Titanium Alloys written by Sujoy Kumar Kar and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The accelerated insertion of titanium alloys in component application requires the development of predictive capabilities for various aspects of their behavior, for example, phase stability, microstructural evolution and property-microstructure relationships over a wide range of length and time scales. In this presentation some novel aspects of property-microstructure relationships and microstructural evolution in alpha/beta Ti alloys will be discussed. Neural Network (NN) Models based on a Bayesian framework have been developed to predict the mechanical properties of alpha/beta Ti alloys. The development of such rules-based model requires the population of extensive databases, which in the present case are microstructurally-based. The steps involved in database development include producing controlled variations of the microstructure using novel approaches to heat-treatments, the use of standardized stereology protocols to characterize and quantify microstructural features rapidly, and mechanical testing of the heat-treated specimens. These databases have been used to train and test NN Models for prediction of mechanical properties. In addition, these models have been used to identify the influence of individual microstructural features on the mechanical properties, consequently guiding the efforts towards development of more robust mechanistically based models. In order to understand the property-microstructure relationships, a detailed understanding of microstructure evolution is imperative. The crystallography of the microstructure developing as a result of the solid-state beta to beta + alpha transformation has been studied in detail by employing Scanning Electron Microscopy (SEM), Orientation Imaging Microscopy (in a high resolution SEM), site-specific TEM sample preparation using focused ion beam, and TEM based techniques. The influence of variant selection on the evolution of microstructure will be specifically addressed.

Texture Strengthening of Heat-treated Alpha-beta Titanium Alloys

Author : J. M. Fitzpatrick
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (246 download)

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Book Synopsis Texture Strengthening of Heat-treated Alpha-beta Titanium Alloys by : J. M. Fitzpatrick

Download or read book Texture Strengthening of Heat-treated Alpha-beta Titanium Alloys written by J. M. Fitzpatrick and published by . This book was released on 1969 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Influence of Processing Variables on the Structure and Properties of Extruded Beta III Titanium

Author : Attwell M. Adair
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis The Influence of Processing Variables on the Structure and Properties of Extruded Beta III Titanium by : Attwell M. Adair

Download or read book The Influence of Processing Variables on the Structure and Properties of Extruded Beta III Titanium written by Attwell M. Adair and published by . This book was released on 1971 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The extrusion temperature and cooling rate after extrusion were varied for round to round axisymmetric extrusions of the Beta 111 titanium alloy. The microstructures after extrusion and after heat treatment were examined both by optical and transmission electron microscopy and correlated with the room temperature mechanical properties. Heat treatment following extrusion consisted of either aging only or a solution treatment followed by aging. In contrast to air cooling after extrusion, direct water quenching immediately after extrusion was effective in retaining a significant amount of dislocation structure from the hot deformation, the effect being greater at the lowest extrusion temperature. This retained dislocation structure effectively promoted the formation of alpha during aging and retarded the tendency for the omega phase to form. The effect was greatest when specimens were aged without the intermediate solution treatment. The greater amount and finer distribution of alpha obtained in this manner resulted in significantly higher tensile strengths, quite acceptable values of RA, but with a small loss in fracture toughness. For the extrusion temperature range investigated, the extrusion pressures for the Beta 111 titanium alloy were somewhat lower than for the older, more well established beta titanium alloy. he extrusion pressures for Beta 111 were also lower than for alpha and alpha plus beta titanium alloys, for temperature ranges where they have significant amounts of alpha present. (Author).

Proceedings of the 13th World Conference on Titanium

Author : Vasisht Venkatesh
Publisher : John Wiley & Sons
ISBN 13 : 1119296099
Total Pages : 2004 pages
Book Rating : 4.1/5 (192 download)

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Book Synopsis Proceedings of the 13th World Conference on Titanium by : Vasisht Venkatesh

Download or read book Proceedings of the 13th World Conference on Titanium written by Vasisht Venkatesh and published by John Wiley & Sons. This book was released on 2016-04-26 with total page 2004 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the Proceedings of the 13th World Conference on Titanium.

Microstructure, Texture Evolution and Mechanical Properties of Cold Rolled Ti-32.5Nb-6.8Zr-2.7Sn Biomedical Beta Titanium Alloy

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)

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Book Synopsis Microstructure, Texture Evolution and Mechanical Properties of Cold Rolled Ti-32.5Nb-6.8Zr-2.7Sn Biomedical Beta Titanium Alloy by :

Download or read book Microstructure, Texture Evolution and Mechanical Properties of Cold Rolled Ti-32.5Nb-6.8Zr-2.7Sn Biomedical Beta Titanium Alloy written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Three-dimensional Reconstruction of Microstructures in [alpha] + [Beta] Titanium Alloys

Author : Erin Patricia Barry
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (233 download)

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Book Synopsis Three-dimensional Reconstruction of Microstructures in [alpha] + [Beta] Titanium Alloys by : Erin Patricia Barry

Download or read book Three-dimensional Reconstruction of Microstructures in [alpha] + [Beta] Titanium Alloys written by Erin Patricia Barry and published by . This book was released on 2008 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling of Microstructure Evolution During the Thermomechanical Processing of Titanium Alloys (Preprint).

Author :
Publisher :
ISBN 13 :
Total Pages : 73 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Modeling of Microstructure Evolution During the Thermomechanical Processing of Titanium Alloys (Preprint). by :

Download or read book Modeling of Microstructure Evolution During the Thermomechanical Processing of Titanium Alloys (Preprint). written by and published by . This book was released on 2008 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium and titanium alloys are widely used for a variety of aerospace, chemical, marine, and other specialty applications because of their high strength, low density, good ductility, fatigue and corrosion resistance, as well as other properties. Depending on the application, a specific property (or combination of properties) can be obtained through microstructural modification. Microstructure evolution and control in titanium alloys is heavily dependent on the allotropic transformation from a hexagonal-close-packed crystal structure (denoted as alpha phase) found at low temperatures to a body-centered-cubic crystal structure (denoted as beta phase) at high temperatures. For pure titanium, this occurs at 882 deg C. In many titanium alloys, the beta phase is partially stabilized at lower temperatures, and the equilibrium volume fractions of alpha and beta vary with temperature. The temperature at which a specific alloy becomes entirely beta is called the beta transus. The conditions used for hot working and heating/heat treatment are often selected relative to the beta-transus temperature.