膨胀及原位观测法研究低碳贝氏体钢轨U25CrNi连续冷却相变

特殊钢 ›› 2022, Vol. 43 ›› Issue (3): 79-84.

膨胀及原位观测法研究低碳贝氏体钢轨U25CrNi连续冷却相变

万菲¹，刘晓卫²，朱敏¹，闻臻¹

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

收稿日期:2021-08-10 出版日期:2022-06-01 发布日期:2022-06-22
作者简介:万菲(1982-),女，硕士(2008年武汉科技大学)，研究员，2005年江汉大学(本科)毕业,高温共聚焦显微镜试验及钢铁材料相变过程研究。

Investigation on Continuous Cooling Transformation Process of Low Carbon Bainite Rail Steel U25CrNi by Dilatation and in-situ Observation Method

WAN Fei¹, LIU Xiao-wei² ,ZHU Min¹, WEN Zhen¹

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

Received:2021-08-10 Published:2022-06-01 Online:2022-06-22

摘要/Abstract

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。

关键词: 原位观察, 热膨胀法, 相变温度, 组织

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.

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.

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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