Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and posteweld heat treatment
SCIE
SCOPUS
- Title
- Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and posteweld heat treatment
- Authors
- Hyunbin Nam; Seonghoon Yoo; LEE, BYEONG JOO; Sangwoo Song; Youngsang Na; Namhyun Kang
- Date Issued
- 2022-07
- Publisher
- Elsevier Editora Ltda
- Abstract
- This study investigated the gas tungsten arc (GTA) weldability of cold-rolled CoCrFeMnNi high-entropy alloys (HEAs) using Cu-coated HEA filler, specifically through the application of various post–weld heat treatment (PWHT) temperatures. The GTA weldability of cold-rolled HEA was evaluated by applying the optimum condition of full penetration, and the effect of PWHT was investigated in the temperature range of 973–1173 K. No macro-defects were detected in the weld metal (WM) to which the Cu coated HEA filler was applied. All the PWHT-applied specimens, including the as-welded specimens, were composed of the FCC phase. The Cu component was solid-solutionized over the entire area of the WM and did not form a precipitate. The tensile properties of the as-welded specimens deteriorated in the presence of CrMn oxides. As the PWHT temperature increased, the grain size in the base metal (BM) increased and inclusions in the WM were re-dissolved. Furthermore, by increasing the PWHT temperature, the hardness of the BM decreased significantly by grain growth, and the WM softened slightly owing to the re-dissolution of inclusions. Therefore, the WMs improved the tensile strength and elongation with increasing PWHT temperature. The application of PWHT significantly improved the weldability of the Cu coated CoCrFeMnNi welds.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/116658
- DOI
- 10.1016/j.jmrt.2022.07.023
- ISSN
- 2238-7854
- Article Type
- Article
- Citation
- Journal of Materials Research and Technology, vol. 19, page. 4857 - 4866, 2022-07
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