Enhancing Microstructural and Mechanical Properties of Ferrous Medium-Entropy Alloy through Cu Addition and Post-Weld Heat Treatment in Gas Tungsten Arc Weldingopen access
- Authors
- Yoo, Seonghoon; Lee, Yoona; Choi, Myeonghawn; Nam, Hyunbin; Nam, Sangyong; Kang, Namhyun
- Issue Date
- Jan-2024
- Publisher
- MDPI
- Keywords
- high-entropy alloy; metals and alloys; design of materials; gas tungsten arc welding; post-weld heat treatment; recrystallisation; heat-affected zone
- Citation
- MATERIALS, v.17, no.1
- Indexed
- SCOPUS
- Journal Title
- MATERIALS
- Volume
- 17
- Number
- 1
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/69347
- DOI
- 10.3390/ma17010181
- ISSN
- 1996-1944
1996-1944
- Abstract
- This study investigates the impact of a high-entropy alloy filler metal coated with copper (Cu) and post-weld heat treatment (PWHT) on the weldability of a ferrous medium-entropy alloy (MEA) in gas tungsten arc welding. The addition of 1-at% Cu had an insignificant effect on the microstructural behaviour, despite a positive mixing enthalpy with other elements. It was observed that a small amount of Cu was insufficient to induce phase separation into the Cu-rich phase and refine the microstructure of the as-welded specimen. However, with an increase in the PWHT temperature, the tensile strength remained mostly consistent, while the elongation significantly increased (elongation of as welded, PWHT700, PWHT800, and PWHT 900 were 19, 43, 55 and 68%, respectively). Notably, the PWHT temperature of 900 degrees C yielded the most desirable results by shifting the fracture location from the coarse-grained heat-affected zone (CGHAZ) to base metal (BM). This was due to significant recrystallisation and homogenised hardness of the cold-rolled BM during PWHT. However, the CGHAZ with coarse grains induced by the welding heat input remained invariant during the PWHT. This study proposes a viable PHWT temperature (900 degrees C) for enhancing the weldability of cold-rolled ferrous MEA without additional process.
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Collections - 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
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