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Effects of deformation-induced martensite and grain size on ductile-to-brittle transition behavior of austenitic 18Cr-10Mn-N stainless steels

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Abstract

Effects of deformation-induced martensite and grain size on ductile-to-brittle transition behavior of austenitic 18Cr-10Mn-(0.3∼0.6)N stainless steels with different alloying elements were investigated by means of Charpy impact tests and microstructural analyses. The steels all exhibited ductile-to-brittle transition behavior due to unusual brittle fracture at low temperatures despite having a face-centered cubic structure. The ductileto-brittle transition temperature (DBTT) obtained from Chapry impact tests did not coincide with that predicted by an empirical equation depending on N content in austenitic Cr-Mn-N stainless steels. Furthermore, a decrease of grain size was not effective in terms of lowering DBTT. Electron back-scattered diffraction and transmission electron microscopy analyses of the cross-sectional area of the fracture surface showed that some austenites with lower stability could be transformed to α’-martensite by localized plastic deformation near the fracture surface. Based on these results, it was suggested that when austenitic 18Cr-10Mn-N stainless steels have limited Ni, Mo, and N content, the deterioration of austenite stability promotes the formation of deformation-induced martensite and thus increases DBTT by substantially decreasing low-temperature toughness.

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Authors and Affiliations

  1. Korea Institute of Materials Science, Changwon, 641-831, Korea

    Byoungchul Hwang, Tae-Ho Lee & Sung-Joon Kim

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  1. Byoungchul Hwang
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  2. Tae-Ho Lee
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  3. Sung-Joon Kim
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Correspondence to Byoungchul Hwang.

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Hwang, B., Lee, TH. & Kim, SJ. Effects of deformation-induced martensite and grain size on ductile-to-brittle transition behavior of austenitic 18Cr-10Mn-N stainless steels. Met. Mater. Int. 16, 905–911 (2010). https://doi.org/10.1007/s12540-010-1208-z

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  • DOI: https://doi.org/10.1007/s12540-010-1208-z

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