期刊
METALS
卷 10, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/met10101366
关键词
high manganese steel; gas tungsten arc welding; annealing; drawing; microstructure
资金
- R&D Program of Korea Evaluation Institute of Industrial Technology (KEIT) as Development of Sub-merged-Arc-Welded Pipe and Extruded Pipe made of High Manganese Steel for Cryogenic Usage in LNG Ship and Offshore Plant [10080728]
- R&D Program of World Class 300 Project (R&D) of the SMBA (Korea) [S2641289]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10080728] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2641289] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the effect of post-weld processes including annealing and drawing on the microstructure and mechanical properties of high-Mn steel pipes welded by gas tungsten arc welding. The weld metal showed a solidified microstructure having coarse and elongated grains due to coalescence of columnar dendrite into welding heat direction. After post-annealing, the solidified microstructure changed into equiaxed grains due to recrystallization and grain growth. Mn segregation occurred during welding solidification and caused lower stacking fault energy (SFE) in the Mn-depleted region. Although epsilon-martensite formation in the as-welded state and during deformation was expected due to decreased SFE of the Mn-depleted zone, all regions showed a fully austenitic phase. The annealing process decreased strength due to grain coarsening but increased ductility. The drawing process increased strength of weld metal through work hardening. All pipes showed decreasing strain rate sensitivity (SRS) with deformation and negative SRS after certain strain levels. It was confirmed that negative SRS is related to less formation of mechanical twinning at a higher strain rate. This work provides fundamental insights into manufacturing a high-Mn steel pipe and manipulating its properties with annealing and drawing processes.
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