等温冷却时间对Ti-V-Mo复合微合金钢组织转变及硬度的影响

doi:10.13251/j.issn.0254-6051.2021.06.020

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 95-101.DOI: 10.13251/j.issn.0254-6051.2021.06.020

等温冷却时间对Ti-V-Mo复合微合金钢组织转变及硬度的影响

于银俊¹, 赵时雨², 张可², 李昭东³, 陈子豪², 张青², 王新志¹, 钱健清²

1.安阳钢铁股份有限公司, 河南安阳 455004;
2.安徽工业大学冶金工程学院, 安徽马鞍山 243032;
3.钢铁研究总院工程用钢研究所, 北京 100081

收稿日期:2021-02-25 出版日期:2021-06-25 发布日期:2021-07-21
通讯作者: 张可,博士,E-mail:huzhude@yeah.net
作者简介:于银俊(1965—),男,高级工程师,硕士,主要研究方向为钢铁生产技术与研发,E-mail:364822438@qq.com。
基金资助:
国家自然科学基金(51704008);国家重点研发计划(2017YFB0304700)

Effect of isothermal cooling time on microstructure transformation and hardness of a Ti-V-Mo microalloyed steel

Yu Yinjun¹, Zhao Shiyu², Zhang Ke², Li Zhaodong³, Chen Zihao², Zhang Qing², Wang Xinzhi¹, Qian Jianqing²

1. Anyang Iron and Steel Group Co., Ltd., Anyang Henan 455004, China;
2. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
3. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2021-02-25 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 通过OM、SEM、TEM和维氏硬度计等手段研究了不同等温冷却时间对Ti-V-Mo复合微合金钢组织转变、析出行为及硬度的影响,探讨了影响硬度变化的因素。结果表明,Ti-V-Mo复合微合金钢奥氏体化后在630 ℃等温冷却0~3 h,随着等温时间的延长,基体中的铁素体比例不断增加而马氏体和贝氏体比例逐渐降低,硬度呈现先升高再趋于平稳,再升高至其最大值,最后略有下降。60~1200 s时,硬度出现平台是因为纳米级(Ti, V, Mo)C粒子的沉淀强化效果能够弥补相变导致基体软化造成的硬度损失;3600 s时,硬度达到最大值为457 HV,此时纳米级(Ti, V, Mo)C粒子产生的沉淀强化效果最佳。

关键词: Ti-V-Mo微合金钢, 沉淀强化, 铁素体, 等温冷却时间, 硬度

Abstract: Effect of isothermal cooling time on microstructure transformation, precipitation behavior and hardness of a Ti-V-Mo microalloyed steel was investigated by means of OM, SEM, TEM and Vickers hardness tester, and the factors influencing the hardness change were discussed. The results reveal that when the Ti-V-Mo microalloyed steel after austenitization is isothermally cooled at 630 ℃ from 0 to 3 h, with the increase of isothermal time, the proportion of ferrite in the matrix increases while the proportion of martensite and bainite decreases. In addition, the hardness increases firstly and then becomes stable, then re-increases and finally declines slightly. At the isothermal time ranging from 60 s to 1200 s, the hardness plateau occurs because the precipitation strengthening effect of (Ti, V, Mo)C nano-particles can compensate for the hardness loss caused by matrix softening due to phase transformation. When the isothermal time is 3600 s, the maximum hardness is 457 HV, and the precipitation strengthening effect of (Ti, V, Mo)C nano-particles is the best.

Key words: Ti-V-Mo microalloyed steel, precipitation strengthening, ferrite, isothermal cooling time, hardness

中图分类号:

TG142.1

于银俊, 赵时雨, 张可, 李昭东, 陈子豪, 张青, 王新志, 钱健清. 等温冷却时间对Ti-V-Mo复合微合金钢组织转变及硬度的影响[J]. 金属热处理, 2021, 46(6): 95-101.

Yu Yinjun, Zhao Shiyu, Zhang Ke, Li Zhaodong, Chen Zihao, Zhang Qing, Wang Xinzhi, Qian Jianqing. Effect of isothermal cooling time on microstructure transformation and hardness of a Ti-V-Mo microalloyed steel[J]. Heat Treatment of Metals, 2021, 46(6): 95-101.

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等温冷却时间对Ti-V-Mo复合微合金钢组织转变及硬度的影响

Effect of isothermal cooling time on microstructure transformation and hardness of a Ti-V-Mo microalloyed steel

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