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Effect of Carbon Fraction on Stacking Fault Energy of Austenitic Stainless Steels

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Abstract

The effect of C fraction (C/N) on stacking fault energy (SFE) of austenitic Fe-18Cr-10Mn steels with a fixed amount of C + N (0.6 wt pct) was investigated by means of neutron diffraction and transmission electron microscopy (TEM). The SFE were evaluated by the Rietveld whole-profile fitting combined with the double-Voigt size-strain analysis for neutron diffraction profiles using neutron diffraction. The measured SFE showed distinguishable difference and were well correlated with the change in deformation microstructure. Three-dimensional linear regression analyses yielded the relation reflecting the contribution of both C + N and C/N: SFE (mJ/m2) = –5.97 + 39.94(wt pct C + N) + 3.81(C/N). As C fraction increased, the strain-induced γ→ε martensitic transformation was suppressed, and deformation twinning became the primary mode of plastic deformation.

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This work was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

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Authors and Affiliations

  1. Ferroy Alloy Department, Korea Institute of Materials Science, Changwon, 642-831, South Korea

    Tae-Ho Lee (Principal Researcher), Heon-Young Ha (Senior Researcher) & Byoungchul Hwang (Senior Researcher)

  2. Graduate Institute of Ferrous Technology, Pohang University of Science & Technology, Pohang, 790-784, South Korea

    Sung-Joon Kim (Professor)

  3. Neutron Physics Department, Korea Atomic Energy Research Institute, Daejeon, 305-600, South Korea

    Eunjoo Shin (Senior Researcher)

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  1. Tae-Ho Lee
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  2. Heon-Young Ha
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  3. Byoungchul Hwang
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  4. Sung-Joon Kim
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  5. Eunjoo Shin
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Correspondence to Tae-Ho Lee.

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Manuscript submitted April 25, 2012.

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Lee, TH., Ha, HY., Hwang, B. et al. Effect of Carbon Fraction on Stacking Fault Energy of Austenitic Stainless Steels. Metall Mater Trans A 43, 4455–4459 (2012). https://doi.org/10.1007/s11661-012-1423-y

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