Microstructure and Mechanical Properties of Gas Tungsten Arc Welded High Manganese Steel Sheet
| Autor: | Won-Seok Ko, Nokeun Park, Haeju Jo, Geon-Woo Park, Jong Bae Jeon, Yong-Sik Ahn, Minha Park, Sunmi Shin, Byung Jun Kim |
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| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
Equiaxed crystals Materials science chemistry.chemical_element 02 engineering and technology Welding Tungsten 01 natural sciences law.invention high manganese steels Stacking-fault energy law 0103 physical sciences General Materials Science Base metal lcsh:Mining engineering. Metallurgy 010302 applied physics Gas tungsten arc welding Metallurgy technology industry and agriculture Metals and Alloys gas tungsten arc welding twinning induced plasticity respiratory system Strain rate 021001 nanoscience & nanotechnology Microstructure chemistry 0210 nano-technology |
| Zdroj: | Metals, Vol 9, Iss 11, p 1167 (2019) Metals Volume 9 Issue 11 |
| ISSN: | 2075-4701 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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