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Modeling the Influence of Microstructure in Rolling Contact Fatigue

机译：微观结构对滚动接触疲劳的影响建模

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Crack nucleation, first spall generation, and spall growth in rolling contact fatigue (RCF) are known to be highly sensitive to the heterogeneity of the microstructure. Yet the current state-of-the-art in the design of high performance bearing materials and microstructures is highly empirical requiring substantial lengthy experimental testing to validate the reliability and performance of these new materials and processes. We have laid the groundwork necessary to determine the influence of microstructure in RCF to aid in the development and processing of bearing steels. Microstructure attributes that may control the fatigue behavior are explicitly modeled in a 41 xxx steel. The methodology is demonstrated by studying the role of an aluminum oxide inclusion embedded in a matrix of tempered martensite and retained austenite. The matrix is represented by crystal plasticity, which provides more realistic accumulations of localized plastic strains with cycling compare to homogenized J2 plasticity. As a demonstration of the approach, the relative influence of the volume fraction of retained austenite on RCF is evaluated.
机译：已知裂纹成核，第一剥落的产生以及滚动接触疲劳（RCF）中剥落的增长对微观结构的异质性高度敏感。然而，高性能轴承材料和微结构设计的最新技术是高度经验的，需要大量冗长的实验测试才能验证这些新材料和工艺的可靠性和性能。我们为确定RCF的微观结构的影响奠定了必要的基础，以帮助轴承钢的开发和加工。可以控制疲劳行为的微观结构属性在41 xxx钢中明确建模。通过研究嵌入在回火马氏体和残余奥氏体基体中的氧化铝夹杂物的作用，证明了该方法。基质以晶体可塑性为代表，与均质J2可塑性相比，它在循环过程中提供了更真实的局部塑性应变累积。作为该方法的证明，评估了残余奥氏体的体积分数对RCF的相对影响。

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