Co对4Cr5Mo2V钢组织和强韧性的影响

doi:10.13251/j.issn.0254-6051.2021.11.008

摘要/Abstract

摘要： 采用OM、SEM、EDS、硬度测试、室温冲击及高温拉伸等方法研究了Co对4Cr5Mo2V钢的组织和强韧性的影响。结果表明:经1010 ℃淬火30 min,4Cr5Mo2V-Co钢未溶碳化物数量更多,马氏体板条更细;510~600 ℃回火时,4Cr5Mo2V-Co钢的回火硬度较4Cr5Mo2V钢高出1~2 HRC,但二者冲击性能相当;相同初始硬度条件下,4Cr5Mo2V-Co钢具有更高的高温强度,这是因为Co元素的添加促进了4Cr5Mo2V-Co钢二次硬化碳化物的形核速率,并能降低碳化物的粗化速率,从而提高了4Cr5Mo2V-Co钢的强度。

关键词: 热处理, 热作模具钢, 力学性能, 固溶强化

Abstract: Effect of Co on microstructure, strength and toughness of the 4Cr5Mo2V steel was studied by means of OM, SEM, EDS, hardness test, room temperature impact and high temperature tensile tests. The results show that the 4Co5Mo2V-Co steel has more undissolved carbides and the martensite laths are thinner after quenching at 1010 ℃ for 30 min. When tempered at 510-600 ℃, the hardness of the 4Co5Mo2V-Co steel is 1-2 HRC higher than that of the 4Co5Mo2V steel, while the two steels have similar impact properties. The 4Cr5Mo2V-Co steel has higher high-temperature strength under the same initial hardness, which is because the addition of Co promotes the nucleation rate of secondary hardened carbides in the 4Cr5Mo2V-Co steel, and reduces the coarsening rate of carbides, thereby improving the strength of the 4Cr5Mo2V-Co steel.

Key words: heat treatment, hot work die steel, mechanical properties, solid solution strengthening

中图分类号:

TG113.25

邓俊杰, 周健, 刘建雄, 迟宏宵, 樊译. Co对4Cr5Mo2V钢组织和强韧性的影响[J]. 金属热处理, 2021, 46(11): 48-53.

Deng Junjie, Zhou Jian, Liu Jianxiong, Chi Hongxiao, Fan Yi. Effect of Co on microstructure and strength and toughness of 4Cr5Mo2V steel[J]. Heat Treatment of Metals, 2021, 46(11): 48-53.

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