Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment
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 applyi...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422010626 |
| _version_ | 1811188973170589696 |
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| author | Hyunbin Nam Seonghoon Yoo Jeong Won Ha Byeong-Joo Lee Sangwoo Song Youngsang Na Namhyun Kang |
| author_facet | Hyunbin Nam Seonghoon Yoo Jeong Won Ha Byeong-Joo Lee Sangwoo Song Youngsang Na Namhyun Kang |
| author_sort | Hyunbin Nam |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T14:28:14Z |
| format | Article |
| id | doaj.art-e1b2492fe3e142098c1245c32983a3c1 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-11T14:28:14Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-e1b2492fe3e142098c1245c32983a3c12022-12-22T04:18:47ZengElsevierJournal of Materials Research and Technology2238-78542022-07-011948574866Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatmentHyunbin Nam0Seonghoon Yoo1Jeong Won Ha2Byeong-Joo Lee3Sangwoo Song4Youngsang Na5Namhyun Kang6Department of Joining Technology, Korea Institute of Materials Science, Gyeongnam 51508, South KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, South KoreaResearch and Development Center, KOS LTD., Yangsan 50592, South KoreaDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, South KoreaDepartment of Joining Technology, Korea Institute of Materials Science, Gyeongnam 51508, South KoreaDepartment of Special Alloy, Korea Institute of Materials Science, Gyeongnam 51508, South KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, South Korea; Corresponding author.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.http://www.sciencedirect.com/science/article/pii/S2238785422010626High-entropy alloysCu componentPost–weld heat treatmentGTA weldabilityMicrostructureMechanical properties |
| spellingShingle | Hyunbin Nam Seonghoon Yoo Jeong Won Ha Byeong-Joo Lee Sangwoo Song Youngsang Na Namhyun Kang Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment Journal of Materials Research and Technology High-entropy alloys Cu component Post–weld heat treatment GTA weldability Microstructure Mechanical properties |
| title | Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment |
| title_full | Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment |
| title_fullStr | Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment |
| title_full_unstemmed | Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment |
| title_short | Enhancement of tensile properties of gas tungsten arc welds using Cu-coated CoCrFeMnNi filler and post–weld heat treatment |
| title_sort | enhancement of tensile properties of gas tungsten arc welds using cu coated cocrfemnni filler and post weld heat treatment |
| topic | High-entropy alloys Cu component Post–weld heat treatment GTA weldability Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422010626 |
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