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Influence Of Microstructure On Elevated Temperature Fatigue Resistance Of A Titanium Alloy
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Book Synopsis Influence of Microstructure on Elevated-Temperature Fatigue Resistance of a Titanium Alloy by : C. Hoffmann
Download or read book Influence of Microstructure on Elevated-Temperature Fatigue Resistance of a Titanium Alloy written by C. Hoffmann and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strain-controlled, elevated-temperature, low-cycle fatigue behavior of a near ? titanium alloy, Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242S), has been studied in both air and vacuum (10-5 torr) at 525°C over a range of frequency and strain. Of particular interest in this investigation were the influence of microstructure and environment on fatigue behavior. Two different microstructures were obtained by combinations of mechanical processing and heat treatment above and below the ?-transus temperature. Particular attention was given to these microstructural variations and to the effect of environment on the high-temperature low-cycle fatigue behavior of this alloy. The nature of fatigue crack initiation sites was examined by a precision sectioning method. The microstructure was found to have a pronounced effect on fatigue life as well as on the fatigue crack initiation process. Tests performed in vacuum revealed no influence of frequency on fatigue life, which indicated that environmental factors were responsible for the observed frequency effect on tests performed in air. It was also observed that testing in vacuum led to the formation of a number of subsurface crack nucleation sites and to a longer fatigue life. Crack origins in specimens tested in air were located at the surface, and the initiation sites were larger than those observed in vacuum. The features of a fatigue resistant microstructure in addition to environmental effects at elevated temperature are identified and discussed.
Download or read book Titanium Alloys written by Jan Sieniawski and published by BoD – Books on Demand. This book was released on 2013-05-15 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book contains six chapters and covers topics dealing with biomedical applications of titanium alloys, surface treatment, relationships between microstructure and mechanical and technological properties, and the effect of radiation on the structure of the titanium alloys.
Book Synopsis Integrating Temperature Dependence Into a Microstructure-sensitive Fatigue Model for Titanium Alloys by : Jared Michael Darius
Download or read book Integrating Temperature Dependence Into a Microstructure-sensitive Fatigue Model for Titanium Alloys written by Jared Michael Darius and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work seeks to integrate temperature dependence into a microstructure-sensitive fatigue model for titanium alloys produced by both extrusion and electron beam melting (EBM) additive manufacturing, revising and enhancing the MultiStage Fatigue (MSF) model as the foundational model framework. Traditional fatigue modeling has required design engineers to conservatively use a lower-bound estimate of fatigue life predictions given a statistically significant spread of experimental data that can span up to two or sometimes three orders of magnitude for a given test condition. This variation in fatigue data has since been accounted for with the advent of the MSF model, linking individual microstructures to their influence on fatigue life in three distinct stages: incubation, small crack growth, and long crack growth. Since the inception of the MSF model in 2003 by McDowell et al. [1] where it was applied to a cast aluminum alloy, its application has been expanded to a wide range of aluminum alloys, magnesium alloys, steels, polymers, and even one titanium alloy made by laser engineered net shaping (LENS). The MSF model correlates a set of parameters to unify model constants for a given material chemistry across a range of alloys and processing methods. Currently, the Ti-6Al-4V (Ti64) alloy is being implemented in aircraft and spacecraft as a corrosion-resistant lightweight structural metal with good strength retention at elevated temperatures. However, the MSF model lacks any temperature dependence. Therefore, this work integrates a temperature dependence to the MSF model for the first time, applying the model to the Ti64 alloy in two new processing methods. First the microstructure of both materials is characterized. Next, monotonic and fatigue experiments are conducted with both extruded and EBM Ti64 at room temperature and at elevated temperatures (150, 300, and 500 °C). Subsequent fractographic analysis reveals the most deleterious microstructures and failure mecha
Book Synopsis Titanium and Titanium Alloys by : Christoph Leyens
Download or read book Titanium and Titanium Alloys written by Christoph Leyens and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is an excellent reference for materials scientists and engineers needing to gain more knowledge about these engineering materials. Following introductory chapters on the fundamental materials properties of titanium, readers will find comprehensive descriptions of the development, processing and properties of modern titanium alloys. There then follows detailed discussion of the applications of titanium and its alloys in aerospace, medicine, energy and automotive technology.
Book Synopsis Influence of Heat Treatment on the Microstructure and Mechanical Properties of the Titanium Alloy Beta 21S by : Faustine Ndali Busongo
Download or read book Influence of Heat Treatment on the Microstructure and Mechanical Properties of the Titanium Alloy Beta 21S written by Faustine Ndali Busongo and published by . This book was released on 2005 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Properties of High Strength Titanium Alloys at Elevated Temperatures (IMI 685) by :
Download or read book Fatigue Properties of High Strength Titanium Alloys at Elevated Temperatures (IMI 685) written by and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Microstructure, Tensile Deformation, Cyclic Fatigue and Final Fracture Behavior of Commercially Pure Titanium and a Titanium Alloy by : Udaykar Bathini
Download or read book A Study of Microstructure, Tensile Deformation, Cyclic Fatigue and Final Fracture Behavior of Commercially Pure Titanium and a Titanium Alloy written by Udaykar Bathini and published by . This book was released on 2010 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid industrial growth and advances in the domains of engineering and related technologies during the last fifty years have led to the extensive use of traditional metals and their alloy counterparts. Titanium is one such metal which has gained wide popularity in the aerospace and defense related applications owing to a wide range of impressive mechanical properties like excellent specific strength ([sigma]UTS/[rho]), stiffness, corrosion and erosion resistance, fracture toughness and capability to withstand significant temperature variations. Two materials, namely commercial purity titanium (Grade 2), referred to henceforth as Ti-CP (Grade 2) and the "work-horse" alloy Ti-6Al-4V have been chosen for this research study. The intrinsic influence of material composition and test specimen orientation on the tensile and fatigue behavior for both Ti-CP (Grade 2) and Ti-6Al-4V have been discussed. Samples of both Ti-CP (Grade 2) and Ti-6Al-4V were prepared from the as-provided plate stock along both the longitudinal and transverse orientations. The specimens were then deformed to failure in uniaxial tension for the tensile tests and cyclically deformed at different values of maximum stress at constant load ratio of 0.1 for the high cycle fatigue tests. The microstructure, tensile properties, resultant fracture behavior of the two materials is presented in the light of results obtained from the uniaxial tensile tests. The conjoint influence of intrinsic microstructural features, nature of loading and specimen properties on the tensile properties is discussed. Also, the macroscopic fracture mode, the intrinsic features on the fatigue fracture surface and the role of applied stress-microstructural feature interactions in governing failure for the cyclic fatigue properties for both the materials under study Ti-CP (Grade 2) and the "work-horse" alloy Ti-6Al-4V have been discussed in detail. Careful study of the microstructure for Ti-CP (Grade 2) material at a low magnification revealed the primary alpha grains to be intermingled with small pockets of beta grains. Observation at the higher allowable magnifications of the optical microscope revealed very fine alpha phase lamellae located within the beta grain. The microhardness and macrohardness measurements were consistent through the sheet specimen for Ti-CP (Grade 2) and slightly lower compared to Ti-6Al-4V. However, the macrohardness was marginally higher than the microhardness resulting from the presence of a large volume fraction of the soft alpha phase. The hardness values when plotted reveal marginal spatial variability. Tensile fracture of Ti-CP (Grade 2) was at an inclination to the far field tensile stress axis for both longitudinal and transverse orientations. The overload region revealed a combination of fine microscopic cracks, microscopic voids of varying size and randomly distributed through the surface, and a large population of shallow dimples, features reminiscent of locally brittle and ductile failure mechanisms. The maximum stress ([sigma]maximum) versus fatigue life (Nf) characteristics shown by this material is quite different from those non-ferrous metals that exhibit a well-defined endurance limit. When compared at equal values of maximum stress at a load ratio of 0.1, the fatigue life of the transverse specimen is noticeably greater than the longitudinal counterpart. At equivalent values of maximum elastic strain, the transverse specimens revealed noticeably improved fatigue life as compared one-on-one to the longitudinal counterparts. Careful observations of the Ti-6Al-4V alloy microstructure over a range of magnifications spanning very low to high magnification revealed a duplex microstructure consisting of the near equiaxed alpha and transformed beta phases. The primary near equiaxed shaped alpha grains (light in color) was well distributed in a lamellar matrix with transformed beta (dark in color). The microhardness and macrohardness values recorded for the Ti-6Al-4V alloy reveal it to be harder than the commercially pure (Grade 2) material. However, for the Ti-6Al-4V alloy the microhardness is noticeably higher than the corresponding macrohardness value that can be ascribed to the presence of a population of processing-related artifacts and the hard beta-phase. Tensile fracture of the Ti-6Al-4V alloy was macroscopically rough and essentially normal to the far field stress axis for the longitudinal orientation and cup-and-cone morphology for the transverse orientation. However, microscopically, the surface was rough and covered with a population of macroscopic and fine microscopic cracks, voids of varying size, a population of shallow dimples of varying size and shape, features reminiscent of locally brittle and ductile failure mechanisms. When compared at equal values of maximum stress at a load ratio of 0.1, there is a marginal to no influence of microstructure on high cycle fatigue life of both orientations of the alloy.
Book Synopsis Advances in Fatigue Science and Technology by : C. Moura Branco
Download or read book Advances in Fatigue Science and Technology written by C. Moura Branco and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the edited version of lectures and selected research contributions presented at the NATO ADVANCED STUDY INSTITUTE on ADVANCES IN FATIGUE SCIENCE AND TECHNOLOGY. held in Alvor. Portugal, 4th to 15th of April 1988. and organized by CEMUL - Center of Mechanics and Materials of The Technical University of Lisbon. The Institute was attended by 101 participants, including 15 lecturers. from 14 countries. The participants were leading scientists and engineers from universities, research institutions and industry. and also Ph.D~ students. Some participants presented papers during the Institute reporting the state-of-art of their research projects. All the sessions wel'e very active and quite extensive discussions on scientific aspects took place during the Institute. The Advanced Study Institute provided a forum for interaction among eminent scientists and engineers. from different schools of thought and young researchers. The Institute addressed the foundations and current state of the art of essential aspects related to fatigue science and technology, namely: Short Cracks, Metallurgical Aspects, Environmental Fatigue, Threshold Behaviour, Notch Behaviour. Creep and Fatigue Interactions at High Temperature, Multiaxial Fatigue, Low Cycle Fatigue, Methodology of Fatigue Testing, Variable Amplitude Fatigue, Fatigue of Advanced Materials. Elastic-Plastic Fatigue, and several engineering applications such as welded joints, energy systems, offshore structures, automotive industry, machine and engine components. This book is organized in three parts: Part I: Fundamentals of Fatigue Part II: Engineering Applications Part III: Research Contributions The research contributions covered most of the areas referred above.
Book Synopsis Effect of Initial Loads and of Moderately Elevated Temperature on the Room-temperature Fatigue Life of Ti-8Al-1Mo-1V Titanium-alloy Sheet by : L. A. Imig
Download or read book Effect of Initial Loads and of Moderately Elevated Temperature on the Room-temperature Fatigue Life of Ti-8Al-1Mo-1V Titanium-alloy Sheet written by L. A. Imig and published by . This book was released on 1967 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructure-sensitive Plasticity and Fatigue of Three Titanium Alloy Microstructures by : Benjamin Daniel Smith
Download or read book Microstructure-sensitive Plasticity and Fatigue of Three Titanium Alloy Microstructures written by Benjamin Daniel Smith and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium alloys are employed in many advanced engineering applications due to their exceptional properties, i.e., a high strength-to-weight ratio, corrosion resistance, and high temperature strength. The performance of titanium alloys is known to be strongly affected by its inherent microstructure, which forms as a result of its thermo-mechanical processing. These microstructures produce compromise relationships between beneficial and detrimental effects on the alloy's performance. To study these structure-property relationships, two distinct crystal plasticity algorithms have been calibrated to data acquired from cyclic deformation experiments performed on three different Ti microstructures: (1) Ti-6Al-4V beta-annealed, (2) Ti-18 solution-treated, age-hardened (STA), and (3) Ti-18 beta-annealed, slow-cooled, age-hardened (BASCA). The calibrated models have been utilized to simulate fatigue loading of variant microstructures to investigate the influence of mean grain size, crystallographic texture, and phase volume fraction. The driving force for fatigue crack nucleation and propagation is quantified through the calculation of relevant fatigue indicator parameters (FIPs) and radial correlation functions are employed to study the correlation between favorably oriented slip systems and the extreme value FIP locations. The computed results are utilized to observe fatigue performance trends associated with changes to key microstructural attributes.
Book Synopsis Effect of Microstructure on the Fatigue Properties of Ti-6Al-4V Bar by : LJ. Bartlo
Download or read book Effect of Microstructure on the Fatigue Properties of Ti-6Al-4V Bar written by LJ. Bartlo and published by . This book was released on 1969 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructure can have a significant effect on the mechanical properties of titanium alloys. The extent of this effect on the fatigue properties of the Ti-6Al-4V alloy in small diameter bar (0.625 in., 15.875 mm) was studied. Microstructural variations were produced by heat treating from 1550 to 1950 F at 100 F intervals. Three different cooling rates (furnace cooling, air cooling, and water quenching) were employed for each temperature. The room-temperature tensile, smooth, and notch-fatigue properties were evaluated for each thermal condition.
Book Synopsis Effect of Microstructure on High Cycle Fatigue Thresholds in a Turbine Engine Titanium Alloy by : Ravi Kiran Nalla
Download or read book Effect of Microstructure on High Cycle Fatigue Thresholds in a Turbine Engine Titanium Alloy written by Ravi Kiran Nalla and published by . This book was released on 2001 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue of Beta Processed and Beta Heat-treated Titanium Alloys by : Russell Wanhill
Download or read book Fatigue of Beta Processed and Beta Heat-treated Titanium Alloys written by Russell Wanhill and published by Springer Science & Business Media. This book was released on 2011-10-28 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication reviews most of the available literature on the fatigue properties of β annealed Ti-6Al-4V and titanium alloys with similar microstructures. The focus is on β processed and β heat-treated alloys because β annealed Ti-6Al-4V has been selected for highly loaded and fatigue-critical structures, including the main wing-carry-through bulkheads and vertical tail stubs, of advanced high-performance military aircraft. An important aspect of the review is a concise survey of fatigue life assessment methods and the required types of fatigue data. This survey provides the background to recommendations for further research, especially on the fatigue behaviour of β annealed Ti-6Al-4V under realistic fatigue load histories, including the essential topic of short/small fatigue crack growth. Such research is required for independent fatigue life assessments that conform to the aircraft manufacturer’s design requirements, and also for life reassessments that most probably will have to be made during the service life of the aircraft.
Book Synopsis Low-cycle Fatigue and Life Prediction by : Claude Amzallag
Download or read book Low-cycle Fatigue and Life Prediction written by Claude Amzallag and published by ASTM International. This book was released on 1982 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Microstructure on Fretting Fatigue Behavior of a Near-alpha Titanium Alloy by : T. Satoh
Download or read book Influence of Microstructure on Fretting Fatigue Behavior of a Near-alpha Titanium Alloy written by T. Satoh and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate the effect of microstructure on the fretting fatigue behavior of a near-? titanium alloy, fretting fatigue tests were carried out using DAT54, which is used in compressor blades and disks in aircraft gas turbine engines. Two kinds of microstructure in DAT54 were prepared using different solution heat treatment temperatures: one is the equiaxed ? + ? lath microstructure and the other is the transformed ? structure. The plain and fretting fatigue strengths for the equiaxed ? + ? lath microstructure are higher than for the transformed ? structure. Fretting reduced fatigue strengths by a factor of three for both materials. Sensitivity to microstructure in fretting fatigue is relatively low compared with plain fatigue. Shot peening improved fretting fatigue life, because of lower tangential force between the specimen and the contact pad and because of residual stress in compression induced by shot peening treatment.
Book Synopsis Effect of Outdoor Exposure at Elevated Temperature on the Fatigue Life of Ti-8Al-1Mo-1V Titanium Alloy and AM 350 Stainless Steel Sheet by : Edward P. Phillips
Download or read book Effect of Outdoor Exposure at Elevated Temperature on the Fatigue Life of Ti-8Al-1Mo-1V Titanium Alloy and AM 350 Stainless Steel Sheet written by Edward P. Phillips and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Titanium Alloys at Elevated Temperature by : Mike R. Winstone
Download or read book Titanium Alloys at Elevated Temperature written by Mike R. Winstone and published by CRC Press. This book was released on 2001 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the fourth in a series of international conferences on the Microstructure of High Temperature Materials and the first to exclusively focus on the microstructure and properties of titanium alloys. Papers demonstrating the exploitation of these alloys in a wide range of commercial high temperature applications from the automotive to the aerospace industries were presented.
