Effect of Heat Treatment and Drawing on High-Manganese Steel Pipe Welded by Gas Tungsten Arc
| Autor: | Yong-Sik Ahn, Wookjin Lee, Geon-Woo Park, Sung Soo Park, Byung Jun Kim, Minha Park, Haeju Jo, Sunmi Shin, Jong Bae Jeon |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Annealing (metallurgy) microstructure 02 engineering and technology Work hardening Welding 01 natural sciences law.invention law 0103 physical sciences General Materials Science Ductility lcsh:Mining engineering. Metallurgy 010302 applied physics Gas tungsten arc welding Metallurgy Metals and Alloys gas tungsten arc welding Recrystallization (metallurgy) Strain rate 021001 nanoscience & nanotechnology drawing high manganese steel annealing Deformation (engineering) 0210 nano-technology |
| Zdroj: | Metals Volume 10 Issue 10 Metals, Vol 10, Iss 1366, p 1366 (2020) |
| ISSN: | 2075-4701 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|