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Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

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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Authors and Affiliations

  1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, 300072, China

    Li Ma, Junqi Shen & Shengsun Hu

  2. Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd, Shanghai, 200431, China

    Li Ma

  3. School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Jian Han

Authors
  1. Li Ma
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  2. Jian Han
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  3. Junqi Shen
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  4. Shengsun Hu
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Correspondence to Junqi Shen.

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Available online at http://link.springer.com/journal/40195

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Ma, L., Han, J., Shen, J. et al. Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels. Acta Metall. Sin. (Engl. Lett.) 27, 407–415 (2014). https://doi.org/10.1007/s40195-014-0070-2

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  • DOI: https://doi.org/10.1007/s40195-014-0070-2

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