期刊
JOURNAL OF MATERIALS SCIENCE
卷 48, 期 6, 页码 2376-2387出版社
SPRINGER
DOI: 10.1007/s10853-012-7021-y
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资金
- Roberto Rocca Education Program
- Questek Innovations LLC
Several experimental studies have shown that fatigue cracks in Ni-based superalloys preferentially form in the vicinity of favorably oriented annealing twin boundaries. However, this increase in the probability of crack nucleation has not been quantified in detail since 3 material modeling has not typically considered twins. The present work employs finite element simulations and a continuum crystal plasticity constitutive model for RR1000 Ni-based superalloy to assess the potential enhancement of nonlocal fatigue indicator parameters (FIPs) incurred by the presence of I 3 pound twins. Two cases are analyzed: single crystals with twins of different widths subjected to single slip cyclic shear deformation aligned with the twin plane and polycrystals with 20 % of the grains half-twinned. Simulations with and without twins are compared in both cases. The results demonstrate the detrimental effect of twins in shifting the upper tail of the FIP distribution to higher values; this shift is more pronounced with an increase of twin thickness.
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