Experimental and Numerical Analysis of Microstructures and Stress States of Shot-Peened GH4169 Superalloys
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Combining experiments and finite element analysis (FEA), a systematic study was performed to analyze the microstructural evolution and stress states of shot-peened GH4169 superalloy over a variety of peening intensities and coverages. A dislocation density evolution model was integrated into the representative volume FEA model to quantitatively predict microstructural evolution in the surface layers and compared with experimental results. It was found that surface roughness and through-depth residual stress profile are more sensitive to shot-peening intensity compared to coverage due to the high kinetic energy involved. Moreover, a surface nanocrystallization layer was discovered in the top surface region of GH4169 for all shot-peening conditions. However, the grain refinement was more intensified under high shot-peening coverage, under which enough time was permitted for grain refinement. The grain size gradient predicted by the numerical framework showed good agreement with experimental observations.
D. Hu greatly thanks the financial support from National Natural Science Foundation of China (NSFC) (Grant Nos. 51305012 and 51675024). R. Wang acknowledges financial support from NSFC (Grant No. 51375031). J. Song acknowledges financial support from NSFC (Grant No. 51628101), McGill Engineering Doctoral Award and National Sciences and Engineering Research Council (NSERC) Discovery grant (Grant No. RGPIN 418469-2012).
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