稀土La对含Cu马氏体不锈钢显微组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.08.007

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 42-47.DOI: 10.13251/j.issn.0254-6051.2024.08.007

稀土La对含Cu马氏体不锈钢显微组织与力学性能的影响

曹悦¹, 高雪云^1,2, 王海燕^1,2, 邢磊¹, 林鸿亮^1,2

1.内蒙古科技大学材料与冶金学院, 内蒙古包头 014010;
2.广东广青金属科技有限公司, 广东阳江 529533

收稿日期:2024-03-05 修回日期:2024-06-30 出版日期:2024-08-25 发布日期:2024-09-27
通讯作者: 高雪云,副研究员,博士,E-mail:gaoxueyun126@163.com
作者简介:曹悦(1995—),男, 硕士研究生,主要研究方向为优势资源先进金属材料的研究与开发,E-mail:760784151@qq.com。
基金资助:
国家自然科学基金(51961030,51764047);中央引导地方科技发展资金(2022ZY0072);阳江市合金材料与五金刀剪重点产业人才振兴计划专项基金(RCZX2022020)

Effect of rare earth La on microstructure and mechanical properties of Cu-bearing martensitic stainless steel

Cao Yue¹, Gao Xueyun^1,2, Wang Haiyan^1,2, Xing Lei¹, Lin Hongliang^1,2

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Guangdong Guangqing Metal Technology Co., Ltd., Yangjiang Guangdong 529533, China

Received:2024-03-05 Revised:2024-06-30 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 以不含La和含0.012%La的含Cu Cr13马氏体不锈钢为研究对象,对其进行980 ℃固溶油冷和500 ℃不同保温时间的时效处理,借助光学显微镜、扫描电镜、EBSD表征,结合力学性能测试,研究了稀土添加对试验钢显微组织和力学性能的影响。结果表明,稀土La可显著降低不锈钢中δ铁素体体积分数,使淬火马氏体增多,进而增加基体中的位错密度,从而提高油冷后试验钢的硬度和强度。在时效过程中,富Cu颗粒不断析出,在达到时效强化峰阶段可为不锈钢的屈服强度提供贡献约200 MPa,未发现稀土La对富Cu相析出动力学明显的作用行为。同时,由于时效过程中小角度晶界不断减少,大角度晶界增多,使试验钢的塑性显著改善。

关键词: Cr13马氏体不锈钢, La, 显微组织, 析出相, 力学性能

Abstract: Cu-bearing Cr13 martensitic stainless steels without La and with 0.012% La were taken as the test materials, which were subjected to solution treatment at 980 ℃, following by oil cooling, and aging at 500 ℃ for different time. Effect of rare earth addition on microstructure and mechanical properties of the steel was studied by means of optical microscope, scanning electron microscope, EBSD, combined with mechanical property tests. The results show that rare earth La significantly reduces the δ ferrite volume fraction in the steel, leading to an increase of martensite after quenching, which in turn leads to the increase of dislocations in the matrix, and thus improves the hardness and strength of the tested steel. During the aging process, by the continuous precipitation of Cu-rich particles, about 200 MPa can be contributed to the yield strength of the tested steels at the peak stage of aging strengthening, but the rare earth La has no significant effect on the precipitation kinetics of Cu-rich phases. At the same time, the plasticity of the tested steels is significantly improved due to the continuous reduction of low-angle grain boundaries and the increase of high-angle grain boundaries during the aging process.

Key words: Cr13 martensitic stainless steel, La, microstructure, precipitate, mechanical properties

中图分类号:

TG142.1⁺3

曹悦, 高雪云, 王海燕, 邢磊, 林鸿亮. 稀土La对含Cu马氏体不锈钢显微组织与力学性能的影响[J]. 金属热处理, 2024, 49(8): 42-47.

Cao Yue, Gao Xueyun, Wang Haiyan, Xing Lei, Lin Hongliang. Effect of rare earth La on microstructure and mechanical properties of Cu-bearing martensitic stainless steel[J]. Heat Treatment of Metals, 2024, 49(8): 42-47.

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稀土La对含Cu马氏体不锈钢显微组织与力学性能的影响

Effect of rare earth La on microstructure and mechanical properties of Cu-bearing martensitic stainless steel

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