金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 200-204.DOI: 10.13251/j.issn.0254-6051.2021.06.039

• 组织与性能 • 上一篇    下一篇

1.25Cr-0.5Mo钢热处理后的组织与力学性能

徐琛1, 陈广兴2, 张勇伟1, 谭騛2, 许晓嫦2   

  1. 1.湖南华菱湘潭钢铁有限公司, 湖南 湘潭 411101;
    2.中南大学 材料科学与工程学院, 湖南 长沙 410083
  • 收稿日期:2020-12-24 出版日期:2021-06-25 发布日期:2021-07-21
  • 通讯作者: 陈广兴,助理工程师,硕士,E-mail:1740571138@qq.com
  • 作者简介:徐 琛(1984—),男,高级工程师,硕士,主要研究方向为容器钢的研究与开发,E-mail:xuchenok@163.com。

Microstructure and mechanical properties of 1.25Cr-0.5Mo steel after heat treatment

Xu Chen1, Chen Guangxing2, Zhang Yongwei1, Tan Fei2, Xu Xiaochang2   

  1. 1. Xiangtan Iron and Steel Co., Ltd of Hunan Valin, Xiangtan Hunan 411101, China;
    2. School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China
  • Received:2020-12-24 Online:2021-06-25 Published:2021-07-21

摘要: 利用光学显微镜、扫描电镜和力学试验机研究了3种正火组织的1.25Cr-0.5Mo钢在回火和模拟焊后热处理过程中的组织和力学性能演变。结果表明:1.25Cr-0.5Mo钢粗大的铁素体+珠光体组织经模拟焊后热处理,大量粗大的碳化物沿晶界析出,显著降低钢的冲击性能,铁素体晶内细小弥散碳化物的析出略微改善了钢的强度;贝氏体组织中的贝氏体铁素体板条宽化和碳化物粗化降低了钢的强度,但对冲击性能影响不大;1.25Cr-0.5Mo钢的综合力学性能随着铁素体组织含量的增加而变差,当铁素体组织的含量高于38%时,钢板的力学性能将难以满足要求。

关键词: 1.25Cr-0.5Mo钢, 热处理, 显微组织, 力学性能, 碳化物

Abstract: Microstructure evolution and mechanical properties of 1.25Cr-0.5Mo steel with three different normalized microstructures during tempering and simulated post-weld heat treatment were analyzed by means of optical microscope, scanning electron microscope and mechanical testing machine. The results show that a large number of coarse carbides in coarse ferrite+pearlite structure of the 1.25Cr-0.5Mo steel precipitate along the grain boundary after simulated post-weld heat treatment, which reduces the impact property of the steel significantly, while the precipitation of finely dispersed carbides in the ferrite improves the strength of the steel slightly. In addition, the widening of bainite ferrite laths and coarsening of carbides in the bainite structure reduce the strength of the steel, but have little effect on impact property. With the increase of ferrite content, the comprehensive mechanical properties of the 1.25Cr-0.5Mo steel become worse. When the ferrite content is higher than 38%, the mechanical properties of the steel plate will not meet the requirements.

Key words: 1.25Cr-0.5Mo steel, heat treatment, microstructure, mechanical properties, carbides

中图分类号: