Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (10): 114-118.DOI: 10.13251/j.issn.0254-6051.2020.10.023

• MICROSTRUCTURE AND PROPERTIES • Previous Articles     Next Articles

Effect of heat treatment on microstructure and properties of Fe-Cr-Ni low carbon martensitic stainless steel

Xu Rongjun1,2, Tian Weiguang1,2,3, Xu Jialin1,2,3, Lu Haifei1,3, Yin Yanxiong1,2   

  1. 1. Guangdong Guangqing Metal Technology Co., Ltd., Yangjiang Guangdong 529533, China;
    2. Guangdong High-end Stainless Steel Research Institute Co., Ltd., Yangjiang Guangdong 529533, China;
    3. Guangdong Provincial Key Laboratory of High Quality Stainless Steel Technology Research and Development,Yangjiang Guangdong 529533, China
  • Received:2020-04-05 Online:2020-10-25 Published:2020-12-29

Abstract: Fe-13Cr-3.5Ni stainless steel was prepared by vacuum arc melting method, and the effects of different heat treatment processes on its microstructure and hardness were systematically studied. The results show that the Fe-13Cr-3.5Ni stainless steel in smelting-casting state is of typical lath martensite structure. After solid solution treatment at different temperatures and tempered at 600 ℃, the steel consists of lath martensite and a small amount of retained austenite. The content of retained austenite increases firstly and then decreases with the increase of solution treatment temperature, but the hardness firstly decreases and then increases, with the minimum hardness being 101.5 HRB. After quenched at 1000 ℃ and tempered at different temperatures, the steel microstructure is composed of tempered lath martensite and retained austenite. When tempered below 650 ℃, the austenite content gradually increases with the increase of tempering temperature. When the tempering temperature reaches 700 ℃, the retained austenite content decreases, and the Rockwell hardness decreases first and then increases with the increase of tempering temperature, and is in the range of 99-107 HRB.

Key words: martensitic stainless steel, heat treatment, retained austenite, microstructure, hardness

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