Microstructure and Property-Based Statistically Equivalent Representative Volume Elements for Polycrystalline Ni-Based S
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RI and GEORGE WEBER are with the Department of Civil Engineering, Johns Hopkins University, Baltimore, MD 21218. JEAN-CHARLES STINVILLE, WILLIAM LENTHE, and TRESA POLLOCK are with the Department of Materials Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106. CHRISTOPHER WOODWARD is with the Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright Patterson Air Force Base, OH 45433. SOMNATH GHOSH is with the Departments of Civil, Mechanical and Material Science Engineering, Johns Hopkins University, Baltimore, MD 21218. Contact e-mail: [email protected] Manuscript submitted date February 27, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
INTRODUCTION
NICKEL-BASED superalloys are extensively used in the aerospace propulsion industry, e.g., in jet engine turbine components like blades and disks.[1] These components rely heavily on the superior properties of these materials for withstanding creep and fatigue in extreme thermal and corrosive environments. Superalloys are able to retain their strength at a range of low-to-high temperatures, which allows engines to operate at high efficiency without mechanical failure. A succinct review of the use of superalloys in propulsion applications with respect to microstructure and properties is given in Reference 2. Large economic gains can be achieved by improving their reliability through better predictability of relevant properties. Thermomechanical properties at macroscopic scales are strongly influenced
by the microstructure and microscale deformation mechanisms inherent to these materials. Development of computational models at different spatial scales, incorporating appropriate scale-relevant mechanisms, along with morphological characteristics and their distributions are important for the prediction of overall mechanical behavior. There is an increasing trend in the use of microstructure-based mechanistic models for predicting material deformation and extreme behavior. Deformation behavior of polycrystalline Ni-based superalloys has been studied under various loading and temperature conditions, e.g., in References 3, 4, and 5. A review of various deformation mechanisms at different stress and temperature conditions including microtwinning has been given in Reference 6. Mesoscale analyses of superalloys with grain structure and precipitate distributions have been conducted using viscoplastic constitutive laws described in References 7 and 8. A strain gradient and ratedependent crystallographic formulation has been used to investigate length-scale effects on polycrystalline alloys in Reference 9. Crystal plasticity finite-element (CPFE) models have been employed to model size-dependency of creep loadings of single crystal and polycrystalline Ni-based superalloys in References 10 and 11. Multiscale models incorporating mechanisms at different scales have been incorporated in References 12 and 13. In a sequence of papers,[14–17] the respective authors have developed a grain-scale activation energy-based crystal plasticity (AE-CP) mo
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