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Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing

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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.

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Authors and Affiliations

  1. Institute of Special Steels, Central Iron and Steel Research Institute, 100081, Beijing, China

    Yan-guang Cao (Doctor Candidate), Le Xu, Gou-qiang Zhang, Jie Shi & Mao-qiu Wang

Authors
  1. Yan-guang Cao
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  2. Le Xu
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  3. Gou-qiang Zhang
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  4. Jie Shi
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  5. Mao-qiu Wang
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Correspondence to Yan-guang Cao.

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Foundation Item: Item Sponsored by National Natural Science Foundation for Youth of China (51301042)

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Cao, Yg., Xu, L., Zhang, Gq. et al. Rolling Contact Fatigue Properties of SAE 8620 Steel after Case Carburizing. J. Iron Steel Res. Int. 23, 711–716 (2016). https://doi.org/10.1016/S1006-706X(16)30110-8

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  • DOI: https://doi.org/10.1016/S1006-706X(16)30110-8

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