Analysis on Microstructure and Properties of Plasma Welding Joint with Surfaced Cobalt - Based Alloy Layer
The microstructure and microhardness of plasma welding (PAW) joint with surfacing welded cobalt-based alloy have been investigated by using Optical microscope (OP) ,X-ray, scanning electron microscope (SEM),and microhardness testing. The results show that the surfacing layer microstructure is made up of the dendrite (γ-Co) and eutectic (γ-Co+M7C3). The microhardness decreases from surfacing layer to substrate. The highest hardness on the surfacing layer obtains with 550HV up. The fusion zone’s and substrate’s microhardness is about 380HVand 280HV respectively.
Zhengyi Jiang, Xianghua Liu and Jinglong Bu
W. Gao and C. Chen, "Analysis on Microstructure and Properties of Plasma Welding Joint with Surfaced Cobalt - Based Alloy Layer", Advanced Materials Research, Vols. 154-155, pp. 480-484, 2011