Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing

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• 作者：Yan-guang CAO ^{ustbcao@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Le XU ; Gou-qiang ZHANG ; Jie SHI ; Mao-qiu WANG
• 关键词：case hardening steel ; carburizing ; rolling contact fatigue ; contact stress ; SAE 8620 steel
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：23
• 期：7
• 页码：711-716
• 全文大小：2120 K

文摘

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.