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Improvement of low temperature toughness of ferritic Mn steels by alloy modification

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Abstract

A study has been made on the effects of Mn content and addition of Al on the microstructure and mechanical properties of (4-6)Mn steels, with the aim of developing ferritic Mn steels having good combination of tensile properties and impact toughness. It has been shown that the reduction of Mn content to 6 wt% and lower from 8-12 wt% of conventional steels can effectively prevent the occurrence of intergranular fracture, which has been a major problem of (8-12)Mn steels with poor toughness at cryogenic temperature. While increasing Mn content in the binary (4-6)Mn steels results in an increase in strength and a decrease in impact toughness, the addition of 1Al to (4-6)Mn steels results in improvements in both strength and impact toughness as compared to those of the binary (4-6)Mn steels and the best impact toughness has been obtained in the as-rolled 1Al added 4Mn steel, whose microstructure consists of fine acicular ferrite grains.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, POSTECH, Pohang, 790-784, Korea

    Il-Cheol Yi, Yumi Ha & Nack J. Kim

  2. Research Institute of Industrial Science and Technology, Pohang, 790-784, Korea

    K. H. Kwon

  3. Plate Research Group, Technical Research Laboratories, POSCO, Pohang, 790-300, Korea

    Hakcheol Lee

Authors
  1. Il-Cheol Yi
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  2. Yumi Ha
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  3. K. H. Kwon
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  4. Hakcheol Lee
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  5. Nack J. Kim
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Correspondence to Nack J. Kim.

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Yi, IC., Ha, Y., Kwon, K.H. et al. Improvement of low temperature toughness of ferritic Mn steels by alloy modification. Met. Mater. Int. 21, 461–469 (2015). https://doi.org/10.1007/s12540-015-4588-2

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  • DOI: https://doi.org/10.1007/s12540-015-4588-2

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