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首页> 外文期刊>ISIJ international >Effect of Retained Austenite on Sub-surface Initiated Spalling during Rolling Contact Fatigue in Carburized SAE4320 Steel
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Effect of Retained Austenite on Sub-surface Initiated Spalling during Rolling Contact Fatigue in Carburized SAE4320 Steel

机译：保留奥氏体对渗碳SAE4320钢滚动接触疲劳期间亚表面引发剥落的影响

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摘要

The effect of retained austenite (γ_R) on the rolling contact fatigue (RCF) properties of carburized SAE4320 steel was carefully investigated. We prepared specimens comprising four volume fractions of γ_R from 6% to 39% by controlling the subzero heat treatment. The effect of γ_R on the RCF was investigated using hardness measurements. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy. The RCF test revealed that the sub-surface initiated spalling life was prolonged as the volume fraction of γ_R increased. In the area at the depth z_0 where the orthogonal shear stress was maximum, the majority of the γ_R was transformed to martensite, thus resulting in a significant increase in the Vickers hardness. The result of SEM observation showed that the region initially comprising γ_R exhibited a high resistance to RCF. Moreover, the TEM analysis revealed that the initial γ_R region changed into a mixture of very fine hard martensite and some unchanged γ_R during RCF. This suggests that the transformation of γ_R into fine hard martensite during RCF contributed to the improvement of the RCF life.
机译：保留奥氏体（γ_R）对渗碳SAE4320钢的滚动接触疲劳（RCF）性能的影响被仔细研究。通过控制亚单热处理，我们制备了包含从6％至39％的γ_R的四个体积分数的标本。使用硬度测量研究了γ_R对RCF上的影响。 X射线衍射，扫描电子显微镜（SEM）和透射电子显微镜。 RCF测试显示，随着γ_R的体积分数增加，延长亚表面引发的剥落寿命。在深度Z_0处的区域在正交剪切应力最大的情况下，将大部分γ_R转化为马氏体，从而导致维氏硬度显着增加。 SEM观察结果表明，最初包含γ_R的区域表现出对RCF的高抗性。此外，TEM分析显示初始γ_R区域在RCF期间改变为非常精细的硬马氏体和一些不变的γ_R的混合物。这表明在RCF期间将γ_R转化为细硬马氏体有助于改善RCF寿命。

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  • 来源
    《ISIJ international》 |2020年第8期|1774-1783|共10页
  • 作者

    Kohei KANETANI; Tsuyoshi MIKAMI; Kohsaku USHIODA;

  • 作者单位

    Material R&D Dept JTEKT Corporation 24-1 Kokubuhiganjo-cho Kashiwara Osaka 582-8588 Japan Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa Ishikawa 920-1192 Japan;

    Material R&D Dept JTEKT Corporation 24-1 Kokubuhiganjo-cho Kashiwara Osaka 582-8588 Japan;

    Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa Ishikawa 920-1192 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    rolling contact fatigue (RCF); steel; martensite; austenite; phase transformation; microstruc-tural alteration; XRD; SEM; TEM;

    机译：滚动接触疲劳（RCF）;钢;马氏体;奥氏体;相变;微动脉变形;XRD;SEM;TEM;

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