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Effect of Mn Content on Microstructure and Cryogenic Mechanical Properties of a 7% Ni Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effect of Mn content on the microstructure and cryogenic mechanical properties of a 7% Ni steel was investigated within the Mn content range from 0.13% to 0.36%. The microstructure of the steel as determined by optical microscopy, scanning electron microscopy, transmission electron microscopy, electron backscattering diffraction and X-ray diffraction was presented, and the low-temperature mechanical properties were given. The size of prior austenite grain did not change a lot as Mn content increased. Film-like reversed austenite, having high stability, was found mainly in the specimens with lower Mn content; however, in the specimen with the highest Mn content, the role of Mn was not obvious in stabilizing reversed austenite. Besides, with increasing Mn content, the amount of reversed austenite at grain boundaries gradually decreased. The variable Mn content had a significant effect on cryogenic toughness, but not apparent on cryogenic tensile strength or yield strength. An excellent combination of cryogenic tensile and impact properties was obtained when Mn content of steel was 0.13%.

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Acknowledgement

This work was financially supported by Wuhan Iron and Steel (Group) Corp.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Hong-Wei Cao

  2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Hong-Wei Cao, Xing-Hong Luo & Shi Liu

  3. Research and Development Center of Wuhan Iron and Steel (Group) Corp, Wuhan, 430080, China

    Guo-Feng Zhan

Authors
  1. Hong-Wei Cao
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  2. Xing-Hong Luo
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  3. Guo-Feng Zhan
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  4. Shi Liu
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Corresponding author

Correspondence to Xing-Hong Luo.

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

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Cao, HW., Luo, XH., Zhan, GF. et al. Effect of Mn Content on Microstructure and Cryogenic Mechanical Properties of a 7% Ni Steel. Acta Metall. Sin. (Engl. Lett.) 31, 699–705 (2018). https://doi.org/10.1007/s40195-018-0700-1

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  • DOI: https://doi.org/10.1007/s40195-018-0700-1

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