GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals
Gas tungsten arc (GTA) weldability of rolled CoCrFeMnNi high-entropy alloys (HEAs) was conducted using stainless steel (STS) 308L and HEA fillers. Microstructure and mechanical properties of the welds were examined to determine GTA weldability of the rolled HEA. The welds had no macro-defects, and c...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-10-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/10/10/1371 |
| _version_ | 1827704312182079488 |
|---|---|
| author | Hyunbin Nam Seonghoon Yoo Junghoon Lee Youngsang Na Nokeun Park Namhyun Kang |
| author_facet | Hyunbin Nam Seonghoon Yoo Junghoon Lee Youngsang Na Nokeun Park Namhyun Kang |
| author_sort | Hyunbin Nam |
| collection | DOAJ |
| description | Gas tungsten arc (GTA) weldability of rolled CoCrFeMnNi high-entropy alloys (HEAs) was conducted using stainless steel (STS) 308L and HEA fillers. Microstructure and mechanical properties of the welds were examined to determine GTA weldability of the rolled HEA. The welds had no macro-defects, and component behaviour between base metal (BM) and weld metal (WM) showed significant differences in the weld using the STS 308L filler. Macro-segregation of Fe components was confirmed in the central region in the WM using the STS 308L filler. Because the columnar grain sizes of all the WMs were larger than those of the rolled HEA BM irrespective of the filler metals, the tensile properties of the GTA welds were lower than those of the rolled HEA BM, and the tensile fracture occurred in the centreline of each weld. In particular, the tensile properties of the weld using the STS 308L filler deteriorated more than those of the HEA weld. This was induced by the formation of macro-segregation and severe martensite transformation in the centreline of WM. To enhance the weldability of the rolled HEA, the formation of macro-segregation and coarse grains in the WM of GTA welds must be prevented. |
| first_indexed | 2024-03-10T15:37:54Z |
| format | Article |
| id | doaj.art-d6bdf9101f314e6b9715a7fc9c2e9801 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T15:37:54Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d6bdf9101f314e6b9715a7fc9c2e98012023-11-20T17:05:42ZengMDPI AGMetals2075-47012020-10-011010137110.3390/met10101371GTA Weldability of Rolled High-Entropy Alloys Using Various Filler MetalsHyunbin Nam0Seonghoon Yoo1Junghoon Lee2Youngsang Na3Nokeun Park4Namhyun Kang5Department of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaYonsei University KIURI Institute, Yonsei University, Seoul 03722, KoreaTitanium Department, Korea Institute of Materials Science, Gyeongnam 51508, KoreaSchool of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaGas tungsten arc (GTA) weldability of rolled CoCrFeMnNi high-entropy alloys (HEAs) was conducted using stainless steel (STS) 308L and HEA fillers. Microstructure and mechanical properties of the welds were examined to determine GTA weldability of the rolled HEA. The welds had no macro-defects, and component behaviour between base metal (BM) and weld metal (WM) showed significant differences in the weld using the STS 308L filler. Macro-segregation of Fe components was confirmed in the central region in the WM using the STS 308L filler. Because the columnar grain sizes of all the WMs were larger than those of the rolled HEA BM irrespective of the filler metals, the tensile properties of the GTA welds were lower than those of the rolled HEA BM, and the tensile fracture occurred in the centreline of each weld. In particular, the tensile properties of the weld using the STS 308L filler deteriorated more than those of the HEA weld. This was induced by the formation of macro-segregation and severe martensite transformation in the centreline of WM. To enhance the weldability of the rolled HEA, the formation of macro-segregation and coarse grains in the WM of GTA welds must be prevented.https://www.mdpi.com/2075-4701/10/10/1371high-entropy alloysfiller metalsmicrostructuremacro-segregationmechanical properties |
| spellingShingle | Hyunbin Nam Seonghoon Yoo Junghoon Lee Youngsang Na Nokeun Park Namhyun Kang GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals Metals high-entropy alloys filler metals microstructure macro-segregation mechanical properties |
| title | GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals |
| title_full | GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals |
| title_fullStr | GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals |
| title_full_unstemmed | GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals |
| title_short | GTA Weldability of Rolled High-Entropy Alloys Using Various Filler Metals |
| title_sort | gta weldability of rolled high entropy alloys using various filler metals |
| topic | high-entropy alloys filler metals microstructure macro-segregation mechanical properties |
| url | https://www.mdpi.com/2075-4701/10/10/1371 |
| work_keys_str_mv | AT hyunbinnam gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals AT seonghoonyoo gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals AT junghoonlee gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals AT youngsangna gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals AT nokeunpark gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals AT namhyunkang gtaweldabilityofrolledhighentropyalloysusingvariousfillermetals |