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Relationship between mechanical properties and high-cycle fatigue strength of medium-carbon steels

机译：中碳钢的力学性能与高周疲劳强度的关系

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摘要

The relationship between the mechanical properties and the fatigue limit (FL) of medium-carbon steels with various microstructures and tensile properties was investigated through measurement of their hardness, tensile properties, and high-cycle fatigue resistance after subjecting them to heat treatment or prestraining. Carbon steels with 0.30 wt% C and 0.55 wt% C subjected to austempering and quenching-tempering treatments underwent microstructure variation from ferrite-pearlite to binate and to tempered martensite, respectively. Cold rolling of austenitic high-Mn steels with 0.57 wt% C caused an increase in their tensile strength owing to strain hardening. Fatigue tests of these materials showed that the FL increased linearly with increasing hardness (HV) of the material irrespective of the microstructure; this relationship can be expressed as FL=1.54·HV+189. In addition, the relationship between the FL and the ultimate tensile strength (UTS) can be expressed as FL=0.55·UTS+134. Application of additional fatigue test results of high-carbon (0.86 wt%) steel and 151 data points extracted from the Fatigue Data Handbook to these HV- or UTS-based FL prediction models confirmed the high reliability of these models, with good agreement between the experimental and predicted FL values.
机译：通过对中碳钢进行热处理或预应变后，通过测量其硬度，拉伸性能和高循环疲劳强度，研究了其力学性能与疲劳极限（FL）之间的关系。碳钢在0.30 wt％C和0.55 wt％C的温度下进行了奥氏体和淬火-回火处理，其组织分别从铁素体-珠光体转变为二元体和回火了马氏体。由于应变硬化，具有0.57 wt％C的奥氏体高锰钢的冷轧导致其抗拉强度增加。这些材料的疲劳试验表明，FL随材料硬度（HV）的增加而线性增加，与微观结构无关。这种关系可以表示为FL = 1.54·HV + 189。另外，FL和极限抗拉强度（UTS）之间的关系可以表示为FL ＝ 0.55·UTS + 134。将高碳钢（0.86 wt％）的附加疲劳测试结果和从疲劳数据手册中提取的151个数据点应用到这些基于HV或UTS的FL预测模型中，证实了这些模型的高可靠性，并且两者之间的一致性很好。实验和预测FL值。

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