B.S., Tsinghua University, Beijing, China, 2012
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The objective of this study is to discover the effect of retained austenite and residual stresses on rolling contact fatigue (RCF). AISI 8620 steels with different levels of retained austenite: 0%, 10%, 20%, 35%, are investigated both numerical and experimentally. A 2-D damage mechanics RCF model incorporating retained austenite and residual stresses has been developed based on results of torsion fatigue test. Corresponding RCF experiments are done on three-ball-on-rod test rig. The numerical and experimental results of fatigue life show a good corroboration. The fatigue spall evolution is also well predicted by the model. In addition, retained austenite transformation (to martensite) and residual stresses relaxation are modeled to give a comprehensive understanding on relationship between retained austenite, residual stresses and rolling contact fatigue.