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首页> 外文期刊>Materials Science and Engineering >Evaluating the fatigue cracking risk of surface strengthened 50CrMnMoVNb spring steel with abnormal life time distribution
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Evaluating the fatigue cracking risk of surface strengthened 50CrMnMoVNb spring steel with abnormal life time distribution

机译：评估具有异常寿命分布的表面强化50CrMnMoVNb弹簧钢的疲劳裂纹风险

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摘要

Surface strengthening is an important method which can effectively improve the fatigue property of metallic materials. In order to improve the fatigue property, for the first time, a new developed surface spinning strengthening-II(3S-II)method and the traditional shot peening (SP) treatment were applied to modify the microstructure and fatigue performance in the surface layer of 50CrMnMoVNb spring steel. It is interesting to find that the fatigue lives of the samples treated by the3S-IImethod show obvious polarization characteristics (either quite higher or slightly lower than those treated bySPmethod) at the high stress amplitude, which does not follow the traditional life distribution rules and cannot be evaluated by theS-Ncurve. Moreover, the fatigue lives of the samples with the fatigue crack initiated from the surface defects are extremely lower than those of the samples whose fatigue crack initiated from the subsurface. Therefore, a fatigue risk factor, "Rf", was proposed and developed based on the competition between the applied stress and the material property to evaluate the fatigue cracking risk of the surface strengthened 50CrMnMoVNb spring steel, especially the fatigue risk of the samples influenced by the mixed factors. The calculation results show that the position whereRf maxappears is exactly the position of fatigue crack initiation. As a result, "Rf" can be used to quantitatively evaluate the fatigue risk of metallic material under the influence of a variety of factors, including surface strengthening, surface roughness and residual compressive stress and so on.
机译：表面强化是可以有效改善金属材料疲劳性能的重要方法。为了提高疲劳性能，首次采用了新开发的表面纺丝强化-II（3S-II）方法和传统的喷丸处理（SP）处理，以改变合金表面层的组织和疲劳性能。 50CrMnMoVNb弹簧钢。有趣的是，在较高的应力振幅下，用3S-II方法处理的样品的疲劳寿命表现出明显的极化特性（比用SP方法处理的样品明显更高或稍低），这不遵循传统的寿命分布规则，并且不能由S-N曲线评估。此外，具有从表面缺陷引发的疲劳裂纹的样品的疲劳寿命与从表面缺陷引起的疲劳裂纹的样品的疲劳寿命相比，极低。因此，根据外加应力与材料性能之间的竞争关系，提出并建立了疲劳风险因子“ Rf”，以评价表面增强的50CrMnMoVNb弹簧钢的疲劳裂纹风险，特别是受试样影响的疲劳风险。混合因素。计算结果表明，Rf max出现的位置恰好是疲劳裂纹萌生的位置。结果，“ Rf”可用于在各种因素的影响下定量评估金属材料的疲劳风险，这些因素包括表面强化，表面粗糙度和残余压应力等。

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  • 来源
    《Materials Science and Engineering》 |2018年第8期|192-204|共13页
  • 作者

    D.Q.Q. Wang; Q. Wang; Y.K. Zhu; P. Zhang; Z.J. Zhang; C.X. Ren; X.W. Li; Z.F. Zhang;

  • 作者单位

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences,Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

    Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University;

    Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spring steel; Surface spinning strengthening; Fatigue crack; Fatigue life; Fatigue risk factor;

    机译：弹簧钢;表面旋转强化;疲劳裂纹;疲劳寿命;疲劳危险因素;

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