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The role of ausforming in the stability of retained austenite in a medium-C carbide-free bainitic steel

机译：空心形成在中碳纤面钢中保留奥氏体稳定性的作用

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In this work, the influence of thermomechanical treatments, consisting of a combination of ausforming followed by isothermal holding and cooling to room temperature, on the stability of retained austenite of a carbide-free medium carbon-high silicon steel was investigated. The amount of retained austenite and its transformation to martensite for a range of ausforming treatments was determined by means of X-ray diffraction, dilatometry signal analysis, and metallographic investigation. Different amounts of deformations were applied at 600 °C in the austenite region prior to fast cooling into the bainitic transformation region. Four isothermal temperatures (325, 350, 375, and 400 °C) with a holding time of 1800 s were selected to estimate the extent of the stability of the retained austenite after the completion of the bainitic transformation. The results show that the deformation-free austenite was more stable for the samples isothermally treated at temperatures between 325 and 350 °C. However, the decomposition of retained austenite to martensite during cooling to room temperature increased for isothermal holding temperatures above 350 °C. It was found that the stability of retained austenite was a function of the temperature and percent deformation, and the critical temperature and percent deformations were determined. It was also found that ausforming enhanced the formation of blocky-shaped retained austenite for isothermal holdings above 350 °C, resulting in a decrease in retained austenite stability. The results were analyzed in terms of the influence of thermomechanical conditions on bainitic transformation and its impact on the transformation of retained austenite to martensite.
机译：在这项工作中，研究了热机械处理的影响，由空转的组合和冷却到室温，对室温保持和冷却至室温，研究了无碳化碳高硅钢的保留奥氏体的稳定性。通过X射线衍射，稀释测定信号分析和金相研究，测定保留奥氏体的量及其对马氏体的转变。在快速冷却到贝氏体转化区域之前，在奥氏体区域中在600℃下施加不同量的变形。选择具有1800秒的保持时间的四个等温度温度（325,350,375和400℃），以估计贝氏体转化完成后保持奥氏体的稳定性程度。结果表明，在325-350℃的温度下，在温度下的样品更稳定地对变形的奥氏体更稳定。然而，在冷却至室温期间将保留的奥氏体对马氏体的分解增加，对于350℃以上的等温保持温度增加。发现保留奥氏体的稳定性是温度和百分比变形的函数，并且测定临界温度和变形百分比。还发现，对于350℃以上的等温恒定增强，具有块状保持奥氏体的形成增强，导致保留奥氏体稳定性降低。在热机械条件对贝氏体转化对马氏体对保留奥氏体转化的影响方面分析了结果。

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