| Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels |
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| 摘 要： | The effects of Ni content and heat-treatment process on the toughness of a super ferritic stainless steel with 26 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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| 关 键 词： | 超级铁素体不锈钢 冲击韧性 热处理温度 微合金化 Ni含量 热处理工艺 热处理过程 延性断裂 |
Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr-3.5Mo Super Ferritic Stainless Steels |
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| Li Ma,;Jian Han,;Junqi Shen,;Shengsun Hu. Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr-3.5Mo Super Ferritic Stainless Steels[J]. Acta Metallurgica Sinica(English Letters), 2014, 0(3): 407-415 |
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| Authors: | Li Ma, Jian Han, Junqi Shen, Shengsun Hu |
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| Affiliation: | [1]Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China; [2]Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd,Shanghai 200431, China; [3]School of Mechanical, Materials and Mechatronic Engineering,University of Wollongong, Wollongong, NSW 2522, Australia |
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| Abstract: | 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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| Keywords: | Super ferritic stainless steel Nickel Heat treatment Toughness |
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