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Park, Sung Soo
Metal Alloy Design (MADe) Lab
Research Interests
  • Metals and alloys, materials properties (mechanical/physical/electrochemical/functional), biomedical implants, metals corrosion

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Effect of heat treatment and drawing on high-manganese steel pipe welded by gas tungsten arc

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Title
Effect of heat treatment and drawing on high-manganese steel pipe welded by gas tungsten arc
Author
Park, Geon-WooJo, HaejuPark, MinhaKim, Byung-JunLee, WookjinShin, SunmiPark, Sung SooAhn, Yong-SikJeon, Jong Bae
Issue Date
2020-10
Publisher
MDPI AG
Citation
METALS, v.10, no.10, pp.1 - 10
Abstract
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 ε-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. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
URI
https://scholarworks.unist.ac.kr/handle/201301/48773
URL
https://www.mdpi.com/2075-4701/10/10/1366
DOI
10.3390/met10101366
ISSN
2075-4701
Appears in Collections:
MSE_Journal Papers
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