金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 161-164.DOI: 10.13251/j.issn.0254-6051.2025.09.025

• 工艺研究 • 上一篇    下一篇

等温淬火对高强度低合金钢贝氏体相变与性能的影响

刘仕超1, 贾虹锋1, 胡宝佳1,2, 田亚强1, 陈连生1   

  1. 1.华北理工大学 冶金与能源学院, 河北 唐山 063210;
    2.华北理工大学 河北钢铁实验室, 河北 唐山 063210
  • 收稿日期:2025-03-18 修回日期:2025-06-27 出版日期:2025-09-25 发布日期:2025-10-13
  • 通讯作者: 胡宝佳,讲师,博士,E-mail: hubj@ncst.edu.cn
  • 作者简介:刘仕超(2000—),男,硕士研究生,主要研究方向为船舰用低合金高强度钢,E-mail: 13383252495@163.com。
  • 基金资助:
    河北省自然科学基金重点项目(E2022209049);河北省高等学校科学研究计划(BJK2024117);唐山市基础研究科技计划(24130205C)

Effect of austempering on bainite transformation and properties of HSLA steel

Liu Shichao1, Jia Hongfeng1, Hu Baojia1,2, Tian Yaqiang1, Chen Liansheng1   

  1. 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China;
    2. Hebei Iron and Steel Laboratory, North China University of Science and Technology, Tangshan Hebei 063210, China
  • Received:2025-03-18 Revised:2025-06-27 Online:2025-09-25 Published:2025-10-13

摘要: 以一种50 kg真空感应炉熔炼舰船用高强度低合金钢为研究对象,采用SEM、TEM、拉伸试验和冲击试验分析测试手段,研究了贝氏体等温时间对钢显微组织和力学性能的影响。结果表明,试验钢经450 ℃贝氏体等温不同时间后,显微组织均主要由板条状贝氏体、片层状M/A岛和析出相组成。随着贝氏体等温时间的增加,M/A岛逐渐细化分解,贝氏体组织占比逐渐增加,试验钢的强度先升高后降低,伸长率先降低后升高,-20 ℃冲击吸收能量逐渐升高。在450 ℃等温处理3 h时,试验钢中贝氏体占比较大,且尺寸较小,此时试验钢的综合性能较好,抗拉强度为1364 MPa,屈服强度为1217 MPa,伸长率为16.96%,-20 ℃冲击吸收能量为98.8 J。

关键词: 高强度低合金钢, 贝氏体, 等温淬火, 力学性能

Abstract: Taking a high-strength low-alloy ship steel prepared by 50 kg vacuum induction furnace as the research object, the effect of bainite austempering time on microstructure and mechanical properties of the steel was studied by means of SEM, TEM, tensile tests and impact tests. The results show that after austempering at 450 ℃ for different time, the microstructure of the steel is mainly composed of lath bainite, lamellar M/A islands and precipitated phases. With the increase of bainite austempering time, the M/A islands gradually is refined and decompose, and the proportion of bainite increases gradually, the strength of the steel first increases and then decreases, the elongation first decreases and then increases, and the impact absorbed energy at -20 ℃ increases gradually. When austempered at 450 ℃ for 3 h, the proportion of bainite in the steel is larger and the size is small, where the steel exhibits good comprehensive properties, with tensile strength of 1364 MPa, yield strength of 1217 MPa, elongation of 16.96%, and the impact absorbed energy at -20 ℃ of 98.8 J.

Key words: high-strength low-alloy steel, bainite, austempering, mechanical properties

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