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

  • Myeonghwan Choi
  • Junghoon Lee
  • Hyunbin Nam
  • Namhyun KangEmail author
  • Myeonghyun Kim
  • Daewon Cho
Article
  • 14 Downloads

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.

Graphic Abstract

Keywords

Submerged arc welds High Mn steels Deformation twin ε-Martensite Tensile strength 

Notes

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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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  • Myeonghwan Choi
    • 1
  • Junghoon Lee
    • 1
  • Hyunbin Nam
    • 1
  • Namhyun Kang
    • 1
    Email author
  • Myeonghyun Kim
    • 2
  • Daewon Cho
    • 3
  1. 1.Department of Materials Science and EngineeringPusan National UniversityBusanRepublic of Korea
  2. 2.Department of Naval Architecture and Ocean EngineeringPusan National UniversityBusanRepublic of Korea
  3. 3.Busan Machinery Research CenterKorea Institute of Machinery and MaterialsBusanRepublic of Korea

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