热处理工艺对低碳高铜HSLA钢组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.05.033

金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 199-203.DOI: 10.13251/j.issn.0254-6051.2024.05.033

热处理工艺对低碳高铜HSLA钢组织与力学性能的影响

王利鹏¹, 葛君超¹, 代昆宏²

1.河南理工大学鹤壁工程技术学院, 河南鹤壁 458030;
2.河南钢铁集团有限公司, 河南郑州 450046

收稿日期:2023-11-20 修回日期:2024-04-01 出版日期:2024-05-25 发布日期:2024-06-28
作者简介:王利鹏（1988—），男，讲师，硕士，主要研究方向为高强钢，E-mail：yueyuelongniao@163.com。
基金资助:
河南省科技攻关项目(202102110271);河南理工大学鹤壁工程技术学院2023年度校级科研项目(2023-ZRYB-020)

Effect of heat treatment on microstructure and mechanical properties of low carbon high copper HSLA steel

Wang Lipeng¹, Ge Junchao¹, Dai Kunhong²

1. Hebi Institute of Engineering and Technology, Henan Polytechnic University, Hebi Henan 458030, China;
2. Henan Iron and Steel Group Co., Ltd., Zhengzhou Henan 450046, China

Received:2023-11-20 Revised:2024-04-01 Online:2024-05-25 Published:2024-06-28

摘要/Abstract

摘要： 对低碳高铜HSLA钢进行了固溶+不同温度时效处理,并借助扫描电镜、透射电镜、拉伸试验、硬度测试、低温冲击试验等手段,研究了时效温度对低碳高铜HSLA钢微观组织与力学性能的影响。结果表明,经880 ℃固溶1 h后,随着时效温度的升高,低碳高铜HSLA钢的抗拉强度、硬度先升高后降低,伸长率逐渐升高,低温冲击吸收能量先降低后升高。440 ℃时效的HSLA钢的抗拉强度和硬度达到峰值,低温冲击吸收能量最低。440 ℃时效的低碳高铜HSLA钢基体上析出了大量5~10 nm的Cu粒子析出相,对HSLA钢起到良好的强化效果。时效温度达到600 ℃时,Cu粒子析出相尺寸达到20~30 nm,明显粗化,强化效果减弱。不同温度时效后低碳高铜HSLA钢的力学性能受Cu颗粒相析出强化和基体软化两方面因素共同影响。时效温度低于440 ℃时,Cu颗粒相析出强化占主导作用。时效温度超过440 ℃时,基体软化占主导作用。

关键词: 低碳高铜HSLA钢, 热处理, 微观组织, 力学性能

Abstract: Low carbon high copper HSLA steel was solution treated and aged at different temperatures. The effect of aging temperature on the microstructure and mechanical properties of the low carbon high copper HSLA steel was studied by means of scanning electron microscopy, transmission electron microscopy, tensile test, hardness test and low temperature impact test. The results show that after solution treatment at 880 ℃ for 1 h, with the increase of aging temperature, the tensile strength and hardness of the HSLA steel increase first and then decrease, the elongation increases gradually, and the impact absorbed energy at low temperature decreases first and then increases. The tensile strength and hardness of the HSLA steel aged at 440 ℃ reach the peak value, and the impact absorbed energy at low temperature is the lowest. A large number of 5-10 nm Cu particles precipitate from the HSLA steel matrix when aged at 440 ℃, which has a good strengthening effect on the HSLA steel. When the aging temperature reaches 600 ℃, the size of precipitated Cu particles reaches 20-30 nm, and the coarsening effect is weakened. The mechanical properties of the HSLA steel aged at different temperatures are jointly affected by two factors which are Cu particle phase precipitation strengthening and matrix softening. When the aging temperature is below 440 ℃, the strengthening effect of Cu particle phase precipitation is dominant. When the aging temperature exceeds 440 ℃, matrix softening plays a dominant role.

Key words: low carbon high copper HSLA steel, heat treatment, microstructure, mechanical properties

中图分类号:

TG161

王利鹏, 葛君超, 代昆宏. 热处理工艺对低碳高铜HSLA钢组织与力学性能的影响[J]. 金属热处理, 2024, 49(5): 199-203.

Wang Lipeng, Ge Junchao, Dai Kunhong. Effect of heat treatment on microstructure and mechanical properties of low carbon high copper HSLA steel[J]. Heat Treatment of Metals, 2024, 49(5): 199-203.

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热处理工艺对低碳高铜HSLA钢组织与力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of low carbon high copper HSLA steel

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