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首页> 外文期刊>Materials Science and Engineering >Stability of retained austenite in martensitic high carbon steels. Part Ⅱ: Mechanical stability
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Stability of retained austenite in martensitic high carbon steels. Part Ⅱ: Mechanical stability

机译：马氏体高碳钢中残留奥氏体的稳定性。第二部分：机械稳定性

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The mechanical stability of retained austenite is explored in martensitic bearing steels under cyclic compressive stresses up to ～ 10~6 cycles at 3 GPa, combining X-ray diffraction and repetitive push testing. Finite element analysis and hardness testing were adopted to interpret the stress distribution across the specimen, and the stress-strain response was revealed. Austenite decomposition was observed for all samples regardless of the difference in their chemical composition and volume percentage. The decomposition is partial and a significant amount of austenite could be retained even after ～ 10~6 stress cycles. A scenario revealing different stages of retained austenite behaviour under compressive stresses has been established. It is observed that retained austenite first decomposes during the first tens of cycles and at 10~3 cycles, whilst it remains stable at cycles ranging 10~2-10~3 and after 10~4. More importantly, results show the potential TRIP effect of retained austenite decom-position on dynamic hardening of bearing steels.
机译：结合X射线衍射和重复推压试验，研究了马氏体轴承钢在3 GPa至10〜6个循环的循环压缩应力下的残余奥氏体力学稳定性。通过有限元分析和硬度测试来解释整个试样的应力分布，并揭示了应力-应变响应。所有样品均观察到奥氏体分解，而无论其化学组成和体积百分比如何。分解是局部的，即使在约10〜6个应力循环后，仍会保留大量奥氏体。已经建立了揭示在压缩应力下残余奥氏体行为的不同阶段的方案。观察到，残余奥氏体在前几十个循环中和在10〜3个循环中首先分解，而在10〜2-10〜3和10〜4之后的循环中保持稳定。更重要的是，结果表明，残余奥氏体分解对轴承钢的动态硬化具有潜在的TRIP效应。

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