Effect of post weld heat treatment on weldability of high entropy alloy welds |
| |
Authors: | Hyunbin Nam Chulho Park Cheolhee Kim Hyoungseop Kim |
| |
Affiliation: | 1. Department of Materials Science and Engineering, Pusan National University, Busan, Korea;2. Joining R&3. D Group, Korea Institute of Industrial Technology, Incheon, Korea;4. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea |
| |
Abstract: | The effect of post weld heat treatment (PWHT) temperature on laser beam welds in high-entropy alloys (HEAs) using a cold-rolled cantor system (CoCrFeMnNi) was investigated. Laser welding of low heat input was applied to reduce thermal distortion. The cold-rolled HEA welds indicated larger grain size and inferior tensile/hardness properties as compared to the base metal (BM). By applying PWHT, the welds showed superior hardness to the BM with no variation in the face-centred cubic phase and a decrease in the size and fraction of CrMn oxide inclusions. As the PWHT temperature increased (800–1000°C), the variation in the grain size decreased between the weld metal and heat-affected zone, thus resulting in approximately the same tensile strength and elongation of the transverse welds as compared to the BM. |
| |
Keywords: | High-entropy alloy laser beam welding post weld heat treatment weldability microstructure mechanical property |
|
|