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首页> 外文会议>Bearing steel technology: Developments in rolling bearing steels and testing >Microstructure and Fatigue Strength of the Bearing Steel 52100 after Shortened Bainitic Treatment
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Microstructure and Fatigue Strength of the Bearing Steel 52100 after Shortened Bainitic Treatment

机译：贝氏体缩短处理后轴承钢52100的组织和疲劳强度

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Quenching to obtain martensite is the mostly applied process for standard rolling element bearings. Isothermal treatment in the lower bainitic range is used as an alternative method to generate favorable compres-sive residual stress on the surface of components, e.g., in spherical roller bearings. The duration of the bainitic treatment, however, is much longer than that of a martensitic treatment because more or less a complete transformation of austenite to bainite is usually requested. This causes higher energy consumption and a longer production period. Therefore it is desirable to perform bainitic treatment with a shortened process duration. In the present work possible processes for shortening the bainitic treatment of the bearing steel 52100 were primarily investigated by dilatometric experiments. Some selected processes were carried out in an industrial salt bath. The microstructures of bainite were observed by optical microscope, transmission electron microscope, and field emission scanning electron microscope. These were compared to martensitic microstructures. The cyclic fatigue strength of the steel after shortened bainitic treatments was examined using a rotating-bar fatigue test. The results show that the fatigue resistance while maintaining the requested minimum hardness of 58 HRC was even enhanced significantly through the shortened treatments particularly by means of a two-step bainitic treatment. The process duration was only about 25 % of the conventional time. The influence of the bainitic microstructure on the fatigue strength of the steel is discussed.
机译：淬火以获得马氏体是标准滚动轴承的最常用方法。在较低的贝氏体范围内进行等温处理是一种替代方法，可在例如球面滚子轴承的零件表面上产生有利的压缩残余应力。然而，贝氏体处理的持续时间比马氏体处理的持续时间长得多，因为通常要求奥氏体或多或少地完全转变成贝氏体。这导致更高的能量消耗和更长的生产周期。因此，期望以缩短的过程持续时间进行贝氏体治疗。在目前的工作中，主要通过膨胀试验研究了缩短轴承钢52100的贝氏体处理的可能方法。一些选定的过程在工业盐浴中进行。通过光学显微镜，透射电子显微镜和场发射扫描电子显微镜观察贝氏体的显微组织。将这些与马氏体微观结构进行比较。使用旋转棒疲劳试验检查缩短贝氏体处理后的钢的循环疲劳强度。结果表明，通过缩短处理，尤其是通过两步贝氏体处理，甚至可以显着提高保持58 HRC所需最低硬度的同时的耐疲劳性。处理持续时间仅为常规时间的约25％。讨论了贝氏体组织对钢疲劳强度的影响。

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