金属热处理 ›› 2022, Vol. 47 ›› Issue (6): 85-88.DOI: 10.13251/j.issn.0254-6051.2022.06.015

• 工艺研究 • 上一篇    下一篇

形变对低碳微合金化热处理钢组织和性能的影响

严翔1, 李德发2, 官计生1, 杨治争1   

  1. 1.宝钢股份 中央研究院(青山), 湖北 武汉 430080;
    2.皖西学院 机械与车辆工程学院, 安徽 六安 237012
  • 收稿日期:2022-01-09 修回日期:2022-03-21 出版日期:2022-06-25 发布日期:2022-07-05
  • 通讯作者: 李德发,高级工程师,E-mail:303_lee@163.com
  • 作者简介:严翔(1977—),男,教授级高级工程师,博士,主要研究方向为船体结构用钢,E-mail:yanxiang027@baosteel.com。
  • 基金资助:
    高层次人才科研启动项目(WGKQ2022016)

Effect of deformation on microstructure and properties of low-carbon microalloyed steel

Yan Xiang1, Li Defa2, Guan Jisheng1, Yang Zhizheng1   

  1. 1. Central Research Institute(Qingshan), Baosteel, Wuhan Hubei 430080, China;
    2. School of Mechanical and Vehicle Engineering, West Anhui University, Liuan Anhui 237012, China
  • Received:2022-01-09 Revised:2022-03-21 Online:2022-06-25 Published:2022-07-05

摘要: 对比研究了在线淬火+回火工艺和传统调质工艺对低碳微合金化船体结构用钢组织和性能的影响,并探讨了其强韧化机制。结果表明,相对于传统调质工艺,采用在线淬火+回火工艺时,控制轧制产生的形变结构提高了在线淬火冷却过程中的相变驱动力和形核率,获得了精细的板条贝氏体组织,并且有利于形成纳米级析出相和高密度位错,从而提高了低碳微合金化钢强度,又保证了良好的低温韧性,总体性能(Rp0.2=599 MPa,KV2(-40 ℃)=272 J/cm2,A=24.5%)达到了590 MPa级船体用钢要求。

关键词: 低碳微合金化钢, 在线淬火, 控制轧制形变, 组织, 性能

Abstract: Effect of online quenching and tempering process and conventional quenching and tempering process on microstructure and properties of a low-carbon microalloyed hull structural steel was comparatively investigated, and the strengthening and toughening mechanisms were discussed. The results show that compared with conventional quenching and tempering process, when the online quenching and tempering process is adopted, the deformation structure generated by the controlled rolling improves the phase transformation driving force and nucleation rate during the online quenching and cooling process, and fine bainitic lath is obtained. It is beneficial to the formation of nano-scale precipitates and high-density dislocations, thereby improving the strength of the low-carbon microalloyed steel and ensuring good low-temperature toughness. The overall performance (Rp0.2=599 MPa,KV2(-40 ℃)=272 J/cm2,A=24.5%) meets the requirements of the 590 MPa class hull steel.

Key words: low-carbon microalloyed steel, online quenching, controlled rolling deformation, microstructure, properties

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