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Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys

Payton, Eric John
http://rave.ohiolink.edu/etdc/view?acc_num=osu1250265477

Abstract Details

2009, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
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 microstructral evolution of powder metallurgical nickel-based superalloys, the mean-field modeling of microstructural evolution, and the quantitative characterization of materials.
Michael Mills, PhD (Advisor)
Yunzhi Wang, PhD (Committee Member)
Hamish Fraser, PhD (Committee Member)
489 p.
Aerospace Materials; Engineering; Materials Science; Metallurgy
physical metallurgy; microstructure; characterization; segmentation; Monte Carlo; coarsening; dissolution; grain growth; superalloy; microscopy; engineering; materials; mean field; gamma prime; nickel; backscatter; diffraction

Recommended Citations

Citations

  • Payton, E. J. (2009). Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250265477

    APA Style (7th edition)

  • Payton, Eric. Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys. 2009. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1250265477.

    MLA Style (8th edition)

  • Payton, Eric. "Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys." Doctoral dissertation, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250265477

    Chicago Manual of Style (17th edition)

osu1250265477
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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.