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- Title
Effect of Post-Welding Treatment on Corrosion Behavior of Laser and Gas Tungsten Arc-Welded (Fe<sub>50</sub>Mn<sub>30</sub>Co<sub>10</sub>Cr<sub>10</sub>)<sub>99</sub>C<sub>1</sub> Interstitial High-Entropy Alloy.
- Authors
Yebaji, Sushil; Sudeep Kumar, T.; Verma, Ayush; Natu, H.; Gowtam, D. S.; Shanmugasundaram, T.
- Abstract
The influence of post-welding heat treatment on the surface and corrosion properties of the interstitial high-entropy alloy (Fe50Mn30Cr10Co10)99C1 has been examined using gas tungsten arc welding (GTAW) and laser welding. The as-welded and post-weld heat-treated samples were characterized using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Face-centered cubic (FCC) and hexagonal close-packed (HCP) structures were present in the base metal. There was no change in the phases after welding and post-heat treatment. After laser and GTAW, a small reduction in hardness (25 HV) was noticed. Following both laser and GTAW processes, the base metal's corrosion resistance dropped. However, heat treatment applied after the weld brought the resistance back to almost base metal levels (0.002 mm/year). The development of Mn oxides on the surface, which minimizes the micro-segregation of Cr and generates a uniform Cr oxides layer, is primarily responsible for the increased corrosion resistance in the post-welded samples. This layer also exhibits superior passivation and corrosion resistance. The study clearly demonstrates that, in Mn-containing high-entropy alloys, it is important to suppress elemental Mn content on the surface for improved corrosion resistance.
- Subjects
IRON-manganese alloys; GAS lasers; GAS tungsten arc welding; LASER welding; TUNGSTEN; FACE centered cubic structure
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5568
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06210-w