回火温度对Ti-V-Mo微合金化马氏体钢析出相和力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.12.009

金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 53-60.DOI: 10.13251/j.issn.0254-6051.2021.12.009

回火温度对Ti-V-Mo微合金化马氏体钢析出相和力学性能的影响

韩荣^1,2, 刘洪喜¹, 尉文超², 王毛球², 时捷²

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院特殊钢研究所, 北京 100081

收稿日期:2021-09-10 出版日期:2021-12-25 发布日期:2022-02-18
通讯作者: 刘洪喜,教授,博士,E-mail:piiiliuhx@sina.com
作者简介:韩荣(1995—),女,硕士研究生,主要研究方向为合金结构钢,E-mail:2849687815@qq.com。

Effect of tempering temperature on precipitation and mechanical properties of Ti-V-Mo microalloyed martensitic steel

Han Rong^1,2, Liu Hongxi¹, Yu Wenchao², Wang Maoqiu², Shi Jie²

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Research Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2021-09-10 Online:2021-12-25 Published:2022-02-18

摘要/Abstract

摘要： 利用微观分析和物理化学相分析法,对不同回火温度(550,600,650 ℃)保温1 h后的Ti-V-Mo微合金化马氏体钢的组织和析出相表征,并进行了强化分量的计算。结果表明,在600 ℃回火时具有最佳的综合力学性能:抗拉强度为1298 MPa,屈服强度为1286 MPa,伸长率为14%。强化分量计算结果表明:析出强化和细晶强化是主要的强化方式,约占总强度的40%和30%,其中析出强化分量σ_p为517 MPa,由5 nm以下的(Ti,V,Mo)C粒子(质量分数22%)提供。回火温度由550 ℃升高到600 ℃,抗拉强度和屈服强度均有增加,同时伸长率变化不大,其主要原因是σ_p对屈服强度的贡献量提高,在提高强度的同时改善了塑性。

关键词: Ti-V-Mo微合金化, 马氏体钢, 回火温度, 析出强化, 力学性能

Abstract: Microstructure and precipitates of Ti-V-Mo microalloyed martensitic steel after quenching and tempering at different temperatures (550,600,650 ℃) for 1 h were characterized by microanalysis and physicochemical phase analysis, and the strengthening components were calculated. The results show that the steel has the best comprehensive mechanical properties when tempered at 600 ℃: the tensile strength is 1298 MPa, the yield strength is 1286 MPa and the elongation is 14%. The calculation results of strengthening component show that precipitation strengthening and fine grain strengthening are the main strengthening mechanism, accounting for about 40% and 30% of the total strength. And precipitation strengthening component σ_p is 517 MPa, provided by (Ti, V, Mo) C particles (mass fraction 22%) below 5 nm. When the tempering temperature increase from 550 ℃ to 600 ℃, the tensile strength and yield strength increase, but the elongation change little. The main reason is that as σ_P contributes to the yield strength increasingly, the plasticity is improved with the strength increasing.

Key words: Ti-V-Mo microalloyed, martensitic steel, tempering temperature, precipitation strengthening, mechanical properties

中图分类号:

TG156.5

韩荣, 刘洪喜, 尉文超, 王毛球, 时捷. 回火温度对Ti-V-Mo微合金化马氏体钢析出相和力学性能的影响[J]. 金属热处理, 2021, 46(12): 53-60.

Han Rong, Liu Hongxi, Yu Wenchao, Wang Maoqiu, Shi Jie. Effect of tempering temperature on precipitation and mechanical properties of Ti-V-Mo microalloyed martensitic steel[J]. Heat Treatment of Metals, 2021, 46(12): 53-60.

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回火温度对Ti-V-Mo微合金化马氏体钢析出相和力学性能的影响

Effect of tempering temperature on precipitation and mechanical properties of Ti-V-Mo microalloyed martensitic steel

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