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Role of Different Kinds of Boundaries Against Cleavage Crack Propagation in Low-Temperature Embrittlement of Low-Carbon Martensitic Steel

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Abstract

The present paper investigated the relationship between low-temperature embrittlement and microstructure of lath martensite in a low-carbon steel from both microstructural and crystallographic points of view. The fracture surface of the specimen after the miniaturized Charpy impact test at 98 K (−175 °C) mainly consisted of cleavage fracture facets parallel to crystallographic {001} planes of martensite. Through the crystallographic orientation analysis of micro-crack propagation, we found that the boundaries which separated different martensite variants having large misorientation angles of {001} cleavage planes could inhibit crack propagation. It was then concluded that the size of the aggregations of martensite variants belonging to the same Bain deformation group could control the low-temperature embrittlement of martensitic steels.

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Acknowledgments

This study was financially supported by Grant-in-Aid for Scientific Research (B) (No. 15H04158), Grant-in-Aid for JSPS Fellows (No. 26·2863), and the Elements Strategy Initiative for Structural Materials (ESISM), through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and the Japan Society for the Promotion of Science (JSPS). The authors greatly appreciate all the support.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan

    Mizuki Tsuboi, Akinobu Shibata & Nobuhiro Tsuji

  2. Department of Mechanical Science and Engineering, Chiba Institute of Technology, Tsudanuma, Narashino, Chiba, 275-0016, Japan

    Daisuke Terada

  3. Elements Strategy Initiative for Structural Materials, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan

    Akinobu Shibata, Daisuke Terada & Nobuhiro Tsuji

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  1. Mizuki Tsuboi
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  2. Akinobu Shibata
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  3. Daisuke Terada
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  4. Nobuhiro Tsuji
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Correspondence to Mizuki Tsuboi.

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Manuscript submitted October 21, 2016.

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Tsuboi, M., Shibata, A., Terada, D. et al. Role of Different Kinds of Boundaries Against Cleavage Crack Propagation in Low-Temperature Embrittlement of Low-Carbon Martensitic Steel. Metall Mater Trans A 48, 3261–3268 (2017). https://doi.org/10.1007/s11661-017-4107-9

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