ժҪ Rolling contact fatigue (RCF) properties of SAE 8620 steel after case carburizing have been investigated under two contact stresses of 4��0 and 5��5 GPa. Results show that the RCF life ranges from 2��5��106 to 3��107 cycles under the contact stress of 5��5 GPa, while it can be more than 1��108 cycles under the contact stress of 4��0 GPa. The rated fatigue life L10 (lives with the 10% failure) is also drastically shortened from 9��8��106 to 5��4��105 cycles when the contact stress is increased from 4��0 to 5��5 GPa. Theoretical calculations and fractographs show that the maximum shear stress and the contact area increase with increasing the contact stress, making RCF tend to occur earlier.
Abstract��Rolling contact fatigue (RCF) properties of SAE 8620 steel after case carburizing have been investigated under two contact stresses of 4��0 and 5��5 GPa. Results show that the RCF life ranges from 2��5��106 to 3��107 cycles under the contact stress of 5��5 GPa, while it can be more than 1��108 cycles under the contact stress of 4��0 GPa. The rated fatigue life L10 (lives with the 10% failure) is also drastically shortened from 9��8��106 to 5��4��105 cycles when the contact stress is increased from 4��0 to 5��5 GPa. Theoretical calculations and fractographs show that the maximum shear stress and the contact area increase with increasing the contact stress, making RCF tend to occur earlier.
��������:National Natural Science Foundation of China For Youth
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E-mail: ustbcao@163.com
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Yan-guang CAO,Le XU,Gou-qiang ZHANG,Jie SHI,Mao-qiu WANG. Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing[J]. �й������ڿ���, 2016, 23(7): 711-716.
Yan-guang CAO,Le XU,Gou-qiang ZHANG,Jie SHI,Mao-qiu WANG. Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing. Chinese Journal of Iron and Steel, 2016, 23(7): 711-716.