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Characterization And Modeling Of Grain Coarsening In Powder Metallurgical Nickel Based Superalloys
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Book Synopsis Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-based Superalloys by : Eric John Payton
Download or read book Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-based Superalloys written by Eric John Payton and published by . This book was released on 2009 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Accurate prediction of grain size as a function of processing conditions is highly sought after in many advanced alloy systems because specific grain sizes must be obtained to meet mechanical property requirements. In powder metallurgical nickel-based superalloys for turbine disk applications, physics-based modeling of grain coarsening is needed to accelerate alloy and process development and to meet demands for higher jet engine operating temperatures. Materials characterization and simulation techniques were integrated and applied simultaneously to enable quantitative representation of the microstructure, to clarify experimental results, and to validate mean-field descriptions of microstructural evolution. The key parameters controlling grain coarsening behavior were identified. A statistical-analytical mean-field model of grain coarsening with an adaptive spatio-temporal mesh was developed to enable rapid physics-based simulation of microstructural evolution. Experimental results were used as initial conditions and the model was then evaluated in the context of experimental results. Deviations of model predictions from experimental observations were then used to recommend future work to resolve remaining issues related to the microstructural evolution of powder metallurgical nickel-based superalloys, the mean-field modeling of microstructural evolution, and the quantitative characterization of materials.
Book Synopsis Grain Growth Phenomena in P/M Ni-base Superalloys by : Kai Song
Download or read book Grain Growth Phenomena in P/M Ni-base Superalloys written by Kai Song and published by . This book was released on 2005 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Microstructure Evolution of Nickel Base Superalloys in Support of the Development of a Grain Growth Model by : Daniel Richard Corwin
Download or read book Characterization of Microstructure Evolution of Nickel Base Superalloys in Support of the Development of a Grain Growth Model written by Daniel Richard Corwin and published by . This book was released on 2007 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: I would like to thank Dr. Michael Mills, my adviser, for providing excellent support and guidance throughout this work. I'd also like to thank Eric Payton for his contributions and advice regarding practically all aspects of this project. Close collaboration with Dr. Yunzhi Wang, Gang Wang, and Ning Ma has been a very beneficial experience that has given me a valuable understanding of microstructure modeling. I am also very appreciative of the help received from Peter Sarosi, Libor Kovarik, and Ray Unocic regarding the transmission electron microscopy performed in this research. I wish to thank Dave Mourer, Deb Whitis, and Dan Wei at GE Aviation for providing guidance and direction in addition to making this research opportunity possible. Thanks to Ron Tolbert for helping procure the needed materials. I am grateful for the superior quality of the Campus Electron Optics Facility at OSU, and I'd like to specifically thank Cameron Begg and Henk Colijn for their assistance with SEM and TEM operation. This research was funded by GE Aviation.
Book Synopsis Time Dependent Constitutive Behavior and Fracture/Failure Processes, Volume 3 by : Tom Proulx
Download or read book Time Dependent Constitutive Behavior and Fracture/Failure Processes, Volume 3 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-05-10 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This the third volume of six from the Annual Conference of the Society for Experimental Mechanics, 2010, brings together 56 chapters on Time-Dependent Constitutive Fracture and Failure. It presents early findings from experimental and computational investigations on Time Dependent Materials including contributions on Thermal and Mechanical Characterization, Coupled Experimental and Computational Analysis of Fracture Path Selection, Procedures for Mixed Mode Fracture Testing of Bonded Beams, and Experimental Study of Voids in High Strength Aluminum Alloys.
Book Synopsis On the Path-dependent Microstructure Evolution of an Advanced Powder Metallurgy Nickel-base Superalloy During Heat Treatment by : Nicholas J. Krutz
Download or read book On the Path-dependent Microstructure Evolution of an Advanced Powder Metallurgy Nickel-base Superalloy During Heat Treatment written by Nicholas J. Krutz and published by . This book was released on 2020 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: The realization of advanced alloy compositions in service relies on a thorough understanding of metallurgical processing variables. Within this work, the gamma prime precipitation of an advanced powder metallurgy nickel-base superalloy during controlled cooling from supersolvus temperatures is compared to prior alloy generations using a complement of characterization and modeling approaches. The on-cooling precipitation of the alloy is studied and characterized to calibrate a multi-scale precipitation model. The proposed framework incorporates a computationally efficient addition to the mean-field modeling approach that increases its ability to model dynamic, multi-modal gamma prime burst events. The gamma prime size predicted by the model shows good agreement with experimental results. The precipitation calculation is applied to the element integration points of a continuum Finite Element heat conduction simulation, where the latent heat generated from the precipitation is accounted for. The results are compared to experimental findings and indicate potential use of the model for evaluating precipitation effects at multiple length scales. The lattice misfit evolution of two commercial PM nickel superalloys during cooling from supersolvus temperatures is also characterized, using in-situ synchrotron X-Ray Diffraction (XRD). The diffraction pattern deconvolution necessary for quantifying misfit was accomplished by combining observation of the superlattice peak intensities with thermodynamic modeling to quantify the intensity relationship between the overlapping phases. The misfit from the XRD measurements was compared to the Scanning Electron Microscopy observations of gamma prime particle shapes for a subset of the experimental conditions. The trend of measured misfit agreed with the microstructural characterization. Time-resolved observations of the on-cooling lattice parameter suggest that lower-temperature changes to the peak intensity characteristics coincide with low misfit magnitudes and a plausible connection to gamma prime burst events. Variation in cooling rate for this alloy and its predecessors shows a tendency for unstable precipitate growth with slower rates. To better understand the effect of precipitate morphology on defect interaction, a series of lab heat treatments of varied cooling rates were carried out and the mechanical response characterized. A phase-field based approach is used to simulate the growth instability of gamma prime precipitates during cooling and compared to post-mortem characterization using serial sectioning and reconstruction. Phase-field modeling is then used to interrogate the interaction of the particle morphology with planar dislocation evolution. It was determined that the incipient stages of particle evolution are dictated by interface growth instability more so than elastic anisotropy effects. Planar deformation in the presence of more evolved particles tended to promote Orowan looping while smaller particles with smaller gamma channel widths showed a tendency for stacking fault formation under the conditions characterized. To further understand precipitate morphology on properties, a stand-alone spectral-based microelasticity model is employed to predict the stress field around the particles. First order deformation assumptions are assessed to understand the effect of the microelastic stress field interacting with dislocations. By comparing the fields of varied precipitate morphologies, it is observed that the magnitudes and spatial distribution of the stress tensor components vary by morphology and may contribute to differences from a defect interaction standpoint.
Download or read book Superalloys 2012 written by Eric S. Huron and published by John Wiley & Sons. This book was released on 2012-10-02 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength at high temperatures. Superalloy development has been driven primarily by the aerospace and power industries. This compilation of papers from the Twelfth International Symposium on Superalloys, held from September 9-13, 2012, offers the most recent technical information on this class of materials.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FY ... US Air Force Plan for Defense Research Sciences by :
Download or read book FY ... US Air Force Plan for Defense Research Sciences written by and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016) by : Elizabeth Holm
Download or read book Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016) written by Elizabeth Holm and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing by : Jinghao Xu
Download or read book Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing written by Jinghao Xu and published by Linköping University Electronic Press. This book was released on 2021-01-28 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. Owing to the combination of extraordinary high-temperature mechanical properties, such as monotonic and cyclic deformation resistance, fatigue crack propagation resistance; and high-temperature chemical properties, such as corrosion and oxidation resistance, phase stability, nickel-based superalloys are widely used in the critical hot-section components in aerospace and energy generation industries. The success of nickel-based superalloy systems attributes to both the well-tailored microstructures with the assistance of carefully doped alloying elements, and the intently developed manufacturing processes. The microstructure of the modern nickel-based superalloys consists of a two-phase configuration: the intermetallic precipitates (Ni,Co)3(Al,Ti,Ta) known as γ′ phase dispersed into the austenite γ matrix, which is firstly introduced in the 1940s. The recently developed additive manufacturing (AM) techniques, acting as the disruptive manufacturing process, offers a new avenue for producing the nickel-based superalloy components with complicated geometries. However, γ′ strengthened nickel-based superalloys always suffer from the micro-cracking during the AM process, which is barely eliminated by the process optimization. On this basis, the new compositions of γ′ strengthened nickel-based superalloy adapted to the AM process are of great interest and significance. This study sought to design novel γ′ strengthened nickel-based superalloys readily for AM process with limited cracking susceptibility, based on the understanding of the cracking mechanisms. A two-parameter model is developed to predict the additive manufacturability for any given composition of a nickel-based superalloy. One materials index is derived from the comparison of the deformation-resistant capacity between dendritic and interdendritic regions, while another index is derived from the difference of heat resistant capacity of these two spaces. By plotting the additive manufacturability diagram, the superalloys family can be categorized into the easy-to-weld, fairly-weldable, and non-weldable regime with the good agreement of the existed knowledge. To design a novel superalloy, a Cr-Co-Mo-W-Al-Ti-Ta-Nb-Fe-Ni alloy family is proposed containing 921,600 composition recipes in total. Through the examination of additive manufacturability, undesired phase formation propensity, and the precipitation fraction, one composition of superalloy, MAD542, out of the 921,600 candidates is selected. Validation of additive manufacturability of MAD542 is carried out by laser powder bed fusion (LPBF). By optimizing the LPBF process parameters, the crack-free MAD542 part is achieved. In addition, the MAD542 superalloy shows great resistance to the post-processing treatment-induced cracking. During the post-processing treatment, extensive annealing twins are promoted to achieve the recrystallization microstructure, ensuring the rapid reduction of stored energy. After ageing treatment, up to 60-65% volume fraction of γ′ precipitates are developed, indicating the huge potential of γ′ formation. Examined by the high-temperature slow strain rate tensile and constant loading creep testing, the MAD542 superalloy shows superior strength than the LPBF processed and hot isostatic pressed plus heat-treated IN738LC superalloy. While the low ductility of MAD542 is existed, which is expected to be improved by modifying the post-processing treatment scenarios and by the adjusting building direction in the following stages of the Ph.D. research. MAD542 superalloy so far shows both good additive manufacturability and mechanical potentials. Additionally, the results in this study will contribute to a novel paradigm for alloy design and encourage more γ′-strengthened nickel-based superalloys tailored for AM processes in the future.
Book Synopsis Superalloys 2024 by : Jonathan Cormier
Download or read book Superalloys 2024 written by Jonathan Cormier and published by Springer Nature. This book was released on with total page 1121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Gamma Prime Precipitates in a Powder Metallurgy Nickel-based Superalloy by : Gabriel Tellier
Download or read book Characterization of Gamma Prime Precipitates in a Powder Metallurgy Nickel-based Superalloy written by Gabriel Tellier and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-based superalloys see wide use in applications requiring high strengths at high temperatures, notably in the blades of gas turbines. An important contributor to this superior high-temperature strength is the presence of Gamma Prime precipitates. This project characterizes the behaviour of a PM nickel-based superalloy consisting of Ni-12Cr-9Fe (w/o) with the addition of 6w/o Al and 0.5w/o Si to refine prediction of precipitate size, improving control of the material properties. The solutionization temperature of Gamma Prime in this alloy was modeled using JMatPro sofware (1040?C), and verified using a Differential Scanning Calorimeter (1092?C). Precise temperature control was found to be more important to control material properties than exact ageing times. Using an Atomic Force Microscope, precipitates in the nanometer range were imaged, and analysed using ImageJ software. A thermo-mechanical deformation procedure increased sample density slightly (5.3%), and is limited to 30% deformation.
Download or read book The Superalloys written by Roger C. Reed and published by Cambridge University Press. This book was released on 2008-07-31 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.
Book Synopsis Development of an Extra-high Strength Powder Metallurgy Nickel-base Superalloy by :
Download or read book Development of an Extra-high Strength Powder Metallurgy Nickel-base Superalloy written by and published by . This book was released on 1977 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superalloys 2020 written by Sammy Tin and published by Springer Nature. This book was released on 2020-08-28 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 14th International Symposium on Superalloys (Superalloys 2020) highlights technologies for lifecycle improvement of superalloys. In addition to the traditional focus areas of alloy development, processing, mechanical behavior, coatings, and environmental effects, this volume includes contributions from academia, supply chain, and product-user members of the superalloy community that highlight technologies that contribute to improving manufacturability, affordability, life prediction, and performance of superalloys.
Book Synopsis The Microstructure of Superalloys by : Madeleine Durand-Charre
Download or read book The Microstructure of Superalloys written by Madeleine Durand-Charre and published by Routledge. This book was released on 2017-11-22 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use. Including more than 100 illustrations, the text explains all the transformation mechanisms involved in the origination (creation) of microstructures during solidification or heat treatments (crystallization paths, segregation, crystal orientation, precipitation, TCP, coarsening and rafting, etc.). It includes up-to-date information and data such as phase diagrams, crystallographic structures, and relationships with functional properties. Nearly 300 references provide a key to further investigation.
