淬火工艺对粉末冶金马氏体不锈钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2022.06.025

金属热处理 ›› 2022, Vol. 47 ›› Issue (6): 128-132.DOI: 10.13251/j.issn.0254-6051.2022.06.025

淬火工艺对粉末冶金马氏体不锈钢组织与性能的影响

刘少尊, 车洪艳, 李欧, 梁晨, 桂舜, 王铁军

中国钢研科技集团有限公司安泰科技股份有限公司, 北京 100081

收稿日期:2022-01-21 修回日期:2022-03-30 出版日期:2022-06-25 发布日期:2022-07-05
作者简介:刘少尊(1986—),男,博士研究生,主要研究方向为高性能金属材料开发,E-mail:liu060301@163.com

Effect of quenching process on microstructure and properties of powder metallurgy martensitic stainless steel

Liu Shaozun, Che Hongyan, Li Ou, Liang Chen, Gui Shun, Wang Tiejun

Advanced Technology & Materials Limited Company, China Iron & Steel Research Institute Group, Beijing 100081, China

Received:2022-01-21 Revised:2022-03-30 Online:2022-06-25 Published:2022-07-05

摘要/Abstract

摘要： 研究了淬火工艺对粉末冶金超高碳不锈钢的微观组织与力学性能的影响。高碳铬粉末冶金不锈钢经900~1200 ℃淬火并于200 ℃回火后,碳化物主要为M₇C₃,少部分为MC,随淬火温度升高,马氏体中固溶碳增大,硬度与抗弯强度升高;经1150 ℃淬火与低温回火后,力学性能达到最佳,硬度为59 HRC,冲击吸收能量为18.9 J,抗弯强度为3079 MPa,碳化物均匀弥散分布于基体中,其中M₇C₃相平均尺寸约为2 μm,体积分数为17%,MC相尺寸为0.5 μm,体积分数为2%;经1200 ℃淬火后残留奥氏体体积分数为35%,导致硬度下降。

关键词: 粉末冶金, 淬火温度, 显微组织, 力学性能, 碳化物

Abstract: Effect of quenching process on microstructure and mechanical properties of a powder metallurgy ultra-high-carbon stainless steel was studied. After quenching between 900-1200 ℃ and then tempering at 200 ℃, the types of carbide of high carbon and chromium powder metallurgical stainless steel are mainly M₇C₃ and a small portion of MC, with the increase of quenching temperature, the solid solution carbon content in martensite increases, leading to an increase of the hardness and flexural strength. After quenching at 1150 ℃ and the following low-temperature tempering, the mechanical properties reach the best, with hardness of 59 HRC, impact absorbed energy of 18.9 J, flexural strength of 3079 MPa; the carbides are uniformly distributed in the matrix, of which the average size and volume fraction of M₇C₃and MC phase are about 2 μm with 17% and 0.5 μm with 2%, respectively. The volume fraction of retained austenite is 35% after quenching at 1200 ℃, resulting in a decrease in hardness.

Key words: powder metallurgy, quenching temperature, microstructure, mechanical properties, carbide

中图分类号:

TG156

刘少尊, 车洪艳, 李欧, 梁晨, 桂舜, 王铁军. 淬火工艺对粉末冶金马氏体不锈钢组织与性能的影响[J]. 金属热处理, 2022, 47(6): 128-132.

Liu Shaozun, Che Hongyan, Li Ou, Liang Chen, Gui Shun, Wang Tiejun. Effect of quenching process on microstructure and properties of powder metallurgy martensitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(6): 128-132.

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淬火工艺对粉末冶金马氏体不锈钢组织与性能的影响

Effect of quenching process on microstructure and properties of powder metallurgy martensitic stainless steel

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