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Open AccessArticle

Microstructure and Mechanical Properties of Gas Tungsten Arc Welded High Manganese Steel Sheet

1
Advanced Surface Coating and Processing R&D Group, Korea Institute for Industrial Technology, Busan 46938, Korea
2
Department of Materials Science and Engineering, Pukyong National University, Busan 48513, Korea
3
School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
4
School of Materials Science and Engineering, Ulsan National University, Ulsan 44610, Korea
5
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Korea
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(11), 1167; https://doi.org/10.3390/met9111167
Received: 27 September 2019 / Revised: 21 October 2019 / Accepted: 24 October 2019 / Published: 29 October 2019
This study investigated microstructure and mechanical properties of high manganese steel sheet fabricated by gas tungsten arc welding (GTAW). The weld zone showed longitudinal coarse grains due to the coalescence of columnar dendrites grown into the direction of heat source, and the HAZ showed equiaxed coarser grains than the base metal due to the thermal effect of GTAW process. Mn segregation occurred in the inter-dendritic regions of the weld zone and Mn depletion thus occurred in the weld matrix. Although the stacking fault energy is expected to be lowered due to the Mn depletion, no noticeable change in the initial phase and deformation mechanism was found in the weld matrix. Lower hardness and strength were shown in the weld zone than the base metal, which was caused by the coarser grain size. The negative strain rate sensitivity observed in the weld zone and the base metal is considered to have originated from the negative strain rate dependency of twinning nucleation stress. View Full-Text
Keywords: high manganese steels; gas tungsten arc welding; twinning induced plasticity high manganese steels; gas tungsten arc welding; twinning induced plasticity
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MDPI and ACS Style

Park, G.-W.; Jo, H.; Park, M.; Shin, S.; Ko, W.-S.; Park, N.; Kim, B.-J.; Ahn, Y.-S.; Jeon, J.B. Microstructure and Mechanical Properties of Gas Tungsten Arc Welded High Manganese Steel Sheet. Metals 2019, 9, 1167.

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