| 膨胀及原位观测法研究低碳贝氏体钢轨U25CrNi连续冷却相变 |
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| 引用本文： | 万菲,刘晓卫,朱敏,闻臻. 膨胀及原位观测法研究低碳贝氏体钢轨U25CrNi连续冷却相变[J]. 特殊钢, 2022, 43(3): 79-84 |
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| 作者姓名： | 万菲 刘晓卫 朱敏 闻臻 |
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| 作者单位： | 1宝钢股份中央研究院，武汉430080；2中国铁路郑州局集团有限公司工务部，郑州450052 |
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| 摘 要： | 利用Formastor-F淬火膨胀仪热模拟和VL2000DX-SVF17SP高温激光共聚焦显微镜观察,研究了U25CrNi低碳贝氏体钢轨(/%:0.25C,1.73Si,1.69Mn,0.012P,0.002S,1.40Cr,0.57]Ni,0.49Mo,0.06V)从950℃以不同冷却速度连续冷却后的膨胀曲线和金相组织。结果表明,低冷速下(0.2℃/s),实验钢组织主要为贝氏体;随冷却速度增大至1℃/s,实验钢组织逐渐过渡为贝氏体和马氏体,且贝氏体板条尺寸随冷速增大而逐渐减小;当冷速达到2℃/s时,冷却过程中基本只发生马氏体相变,实验钢硬度随冷速增大而逐渐增大。
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| 关 键 词： | 原位观察 热膨胀法 相变温度 组织 |
| 收稿时间： | 2021-08-10 |
Investigation on Continuous Cooling Transformation Process of Low Carbon Bainite Rail Steel U25CrNi by Dilatation and in-situ Observation Method |
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| WAN Fei,LIU Xiaowei,ZHU Min,WEN Zhen. Investigation on Continuous Cooling Transformation Process of Low Carbon Bainite Rail Steel U25CrNi by Dilatation and in-situ Observation Method[J]. Special Steel, 2022, 43(3): 79-84 |
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| Authors: | WAN Fei LIU Xiaowei ZHU Min WEN Zhen |
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| Affiliation: | 1 Central Research Institute of Baoshan Iron and Steel Co Ltd, Wuhan 430080 ；2 Ministry of Public Work, China Railway Zhengzhou Bureau Group Co Ltd, Zhengzhou 450052 |
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| Abstract: | By Formastor-F quenching dilatometer thermal simulation and VL2000DX-SVF17SP high temperature laser scanning confocal microscope ( LSCM) observation, the dilatation curve and microstructure of a low carbon bainite rail steel of U25CrNi (/% ：0.25C, 1.73Si, 1.69Mn ,0.012P,0.002S, 1.40Cr,0.57Ni,0.49Mo,0. 06V) during continuous cooling process from 950 °C at different cooling rates are studied. The results show that at low cooling rate (0. 2 °C/s) , the microstructure of test steel is mainly bainite ； as the cooling rate increases to 1 °C/s, the microstructure gradually transforms to bainite and martensite, and the size of the bainite plate gradually decreases with the increase of the cooling rate； when the cooling rate reaches 2 °C/s, basically only the martensite transformation occurs during the cooling process, and the hardness of the test steel gradually increases with the increase of the cooling rate. |
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