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Gigacycle Fatigue Properties of Bearing Steels

机译：轴承钢的Gigacycle疲劳特性

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The concept of a fatigue limit at 10~6 cycles that was introduced by Wohler in 1850 seems nowadays to be the wrong magnitude when considering the fatigue life of modern industrial applications such as automotive engines that run typically billions of cycles. The necessity to increase performances in terms of lifetime and safety in steel fabricated products remains an issue, although testing is becoming more time consuming and costly with current design products. It is the aim of our research to develop better understanding of fatigue properties of steels in the gigacycle domain. One way to approach this is to use a piezoelectric fatigue testing system working at ultrasonic frequency. This paper will describe the research done on several 52100 steels coming from Europe (NF100C6) and Japan (SUJ2). Different heat treatments have been applied to obtain different microstructures: Mar-tensite and bainite with and without residual austenite. The fatigue tests, up to 1011 cycles, have been carried out using piezoelectric machines working at 20 and 30 kHz under tension-compression, tension-tension, and torsion only. A set of specimens has been tested also with a circular notch to observe the effect of stress concentration. Finally the thermal dissipation during testing has been determined using an infrared camera. It is confirmed that the influence of inclusions is a key problem.
机译：考虑到现代工业应用（例如通常运行数十亿次循环的汽车发动机）的疲劳寿命，今天，沃勒（Wohler）在1850年提出的10至6个循环疲劳极限的概念如今看来是错误的。尽管在当前的设计产品中测试变得越来越耗时且成本更高，但是仍然需要提高钢制品的使用寿命和安全性，这仍然是一个问题。我们研究的目的是加深对千兆环领域钢的疲劳性能的了解。解决此问题的一种方法是使用以超声波频率工作的压电疲劳测试系统。本文将描述对来自欧洲（NF100C6）和日本（SUJ2）的52100几种钢进行的研究。已经应用了不同的热处理以获得不同的显微组织：马氏体和贝氏体，有和没有残余奥氏体。使用压电机械在20到30 kHz的频率下仅进行了拉伸压缩，拉伸-拉伸和扭转测试，进行了高达1011个循环的疲劳测试。一组试样也用圆形缺口进行了测试，以观察应力集中的影响。最终，使用红外摄像机确定了测试过程中的散热。已确认夹杂物的影响是关键问题。

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