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Tensile and Microstructural Characteristics of Fe-24Mn Steel Welds for Cryogenic Applications

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Abstract

Herein, we investigated the weldability and relationship between microstructure and tensile properties in 24 wt% Mn steel welds and, specifically, submerged arc welds (SAWs) were produced using these welds for cryogenic applications. The base metal (BM) and weld metal (WM) exhibited a stacking fault energy (SFE) that maintained a stable austenite phase for 27.1 and 17.0 mJ/m2, respectively. Deformation twins were observed after tensile testing of the BM and WM at 298 K. Weld metals using undermatched fillers showed a lower SFE and coarser grain size (~ 86 μm) compared to that of the BM (~ 12 μm). Therefore, the tensile testing at 110 K produced deformation twins and ε-martensite. The formation of ε-martensite with deformation twins antedated necking during tensile testing and elongation decreased at 110 K. However, the SAWs of high Mn steels maintained excellent low-temperature mechanical properties such as elongation, tensile strength, and yield strength with values of 20%, 1150 MPa, and 617 MPa, respectively.

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Acknowledgements

This work was supported by the Ministry of Trade, Industry and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program Grant No. 10080728, and by GCRC-SOP (2011-0030013) of the National Research Foundation of Korea funded by the Ministry of Science and ICT.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea

    Myeonghwan Choi, Junghoon Lee, Hyunbin Nam & Namhyun Kang

  2. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, 46241, Republic of Korea

    Myeonghyun Kim

  3. Busan Machinery Research Center, Korea Institute of Machinery and Materials, Busan, 46744, Republic of Korea

    Daewon Cho

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  1. Myeonghwan Choi
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  2. Junghoon Lee
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Correspondence to Namhyun Kang.

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Choi, M., Lee, J., Nam, H. et al. Tensile and Microstructural Characteristics of Fe-24Mn Steel Welds for Cryogenic Applications. Met. Mater. Int. 26, 240–247 (2020). https://doi.org/10.1007/s12540-019-00320-4

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