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首页> 外文期刊>Journal of Tribology >New methodology to evaluate the rolling contact fatigue performance of bearing steels with surface dents: Application to 32CrMoV13 (nitrided) and M50 steels
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New methodology to evaluate the rolling contact fatigue performance of bearing steels with surface dents: Application to 32CrMoV13 (nitrided) and M50 steels

机译：评估带有表面凹痕的轴承钢滚动接触疲劳性能的新方法：应用于32CrMoV13（氮化）和M50钢

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摘要

A new methodology is proposed to evaluate the rolling contact fatigue (RCF) performance of bearing steels in presence of surface dents. The experimental procedure consists of denting the raceway of test specimens with a hardness machine using spherical diamond tips of different radii (i.e., 200, 400, and 600 mu m) and with an applied normal load ranging from 5 to 50 daN. Analysis of various dent geometries yield an analytical law with five parameters useful for fitting experimental profiles for contact simulation. Fatigue tests are conducted using a two-disk machine to study the effect of different operating conditions on RCF and to compare the performances of nitrided 32CrMoV13 steel versus M50 reference steel. A numerical investigation is conducted to analyze experimental result. Initially, the local residual stresses and plastic strains around the dent are obtained through finite element simulations of the indentation process. Second, the overrolling of the dent is simulated with a contact code. Finally, an indent-based endurance limit, called H11, is proposed and comparisons are made with test results. Both RCF tests and numerical simulations show improved performance with nitrided 32CrMoV13 steel when compared to the M50 reference steel. The dominating role of sliding is also experimentally highlighted and two areas of damage initiation are identified. The effects of normal load and hoop stress are less marked.
机译：提出了一种新的方法来评估存在表面凹痕的轴承钢的滚动接触疲劳（RCF）性能。实验步骤包括用硬度机使试样的滚道凹痕，该硬度机使用不同半径（即200、400和600μm）的球形金刚石尖端，并施加5至50 daN的法向载荷。对各种凹痕几何形状的分析得出了具有五个参数的分析定律，可用于拟合接触仿真的实验轮廓。使用两盘机进行疲劳测试，以研究不同操作条件对RCF的影响，并比较氮化的32CrMoV13钢与M50参比钢的性能。进行了数值研究以分析实验结果。最初，通过压痕过程的有限元模拟获得了凹痕周围的局部残余应力和塑性应变。其次，使用联系代码模拟凹痕的过度滚动。最后，提出了一种基于缩进的耐力极限，称为H11，并与测试结果进行了比较。与M50参比钢相比，RCF测试和数值模拟均显示氮化32CrMoV13钢具有更高的性能。实验还强调了滑动的主导作用，并确定了损坏的两个区域。法向载荷和环向应力的影响不太明显。

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