Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels
来源期刊：Acta Metallurgica Sinica2014年第3期
论文作者：Li Ma Jian Han Junqi Shen Shengsun Hu
文章页码：407 - 415
摘 要：The effects of Ni content and heat-treatment process on the toughness of a super ferritic stainless steel with26 wt% Cr and 3.5 wt% Mo were investigated. It was found that with the increase of Ni content, the Charpy impact toughness improved remarkably, and transformed from cleavage brittle fracture to the most ductile fracture. There were no obvious differences between the high- and low-Ni contents on the microstructure and mechanical properties since the addition of Ni did not influence crystal structure, phase composition, and precipitation of ultra pure ferritic stainless steels.Meanwhile, the heat-treatment process was a key point to maintain a high level of toughness by optimizing structure and removing detrimental precipitation, i.e., chi phase.
Li Ma1,2，Jian Han3，Junqi Shen1，Shengsun Hu1
1. Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University2. Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd3. School of Mechanical, Materials and Mechatronic Engineering,University of Wollongong
摘 要：The effects of Ni content and heat-treatment process on the toughness of a super ferritic stainless steel with26 wt% Cr and 3.5 wt% Mo were investigated. It was found that with the increase of Ni content, the Charpy impact toughness improved remarkably, and transformed from cleavage brittle fracture to the most ductile fracture. There were no obvious differences between the high- and low-Ni contents on the microstructure and mechanical properties since the addition of Ni did not influence crystal structure, phase composition, and precipitation of ultra pure ferritic stainless steels.Meanwhile, the heat-treatment process was a key point to maintain a high level of toughness by optimizing structure and removing detrimental precipitation, i.e., chi phase.
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