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首页> 外文学位 >Surface initiated rolling/sliding contact fatigue in pearlitic and low/medium carbon bainitic steels.
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Surface initiated rolling/sliding contact fatigue in pearlitic and low/medium carbon bainitic steels.

机译：珠光体和低/中碳贝氏体钢的表面引发的滚动/滑动接触疲劳。

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摘要

A study of surface initiated rolling/sliding contact fatigue (RCF) behavior of two pearlitic and four low/medium carbon bainitic steels has focused on three aspects; RCF performance as a function of contact pressure, failure mechanisms, and ratchetting strain behavior including the effect of slide/roll ratio.;A contact pressure range of 858 to 2300 MPa, water lubrication and a slide/roll ratio of 10% were used to establish RCF life. The relationship between rolling contact fatigue life and contact pressure is non-linear. The relative performance of the steels is consistent with their mechanical properties, with longer RCF life being associated with higher strength irrespective of microstructure. The six steels tested exhibited very similar RCF resistance as a function of normalized contact pressure, P;Two distinct crack growth modes have been identified. The shear band cracking mode, which is associated with the severely deformed surface layer, predominates above the theoretical shakedown limit of P;Ratchetting strain data of a pearlitic steel are a non-linear function of both contact pressure and the number of contact cycles. The most important feature of the non-linearity is its asymptotic strain rate behavior. A critical strain concept for crack initiation has been proposed. The variation in ratchetting strain consistently reflected the variation in tangential to normal traction ratios (T/N) at different slide/roll ratios, with a higher strain for higher (T/N) and convergence in strain rate corresponding to convergence in (T/N) ratios as contact cycles increased. The variation in TM values is partially attributed to the influence of sliding distance on the coefficient of friction through building up a stable contact interface, and a stick-slip phenomenon involved at slide/roll ratios
机译：对两种珠光体钢和四种低/中碳贝氏体钢的表面引发的滚动/滑动接触疲劳（RCF）行为的研究集中在三个方面。 RCF性能是接触压力，破坏机理和棘轮应变行为（包括滑动/滚动比的影响）的函数。使用858至2300 MPa的接触压力范围，水润滑和滑动/滚动比为10％建立RCF生活。滚动接触疲劳寿命与接触压力之间的关系是非线性的。钢的相对性能与其机械性能一致，而RCF寿命越长，强度越高，而与微观结构无关。所测试的六种钢表现出非常相似的RCF电阻，这是归一化接触压力P的函数；已经确定了两种不同的裂纹扩展模式。与严重变形的表层有关的剪切带开裂模式主要在P的理论击落极限以上;珠光体钢的拉结应变数据是接触压力和接触循环次数的非线性函数。非线性的最重要特征是其渐近应变率行为。已经提出了用于裂纹萌生的临界应变概念。棘轮应变的变化一致地反映了在不同滑移/滚动比下切向牵引力比（T / N）的变化，较高的应变表示较高的（T / N），应变率的收敛对应于（T / N）的收敛N）比率随着接触循环的增加而增加。 TM值的变化部分归因于滑动距离通过建立稳定的接触界面而对摩擦系数的影响，以及滑动/滚动比所涉及的粘滑现象。

著录项

  • 作者

    Su, Xiaoyan.;

  • 作者单位

    Oregon Graduate Institute of Science and Technology.;

  • 授予单位 Oregon Graduate Institute of Science and Technology.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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