Microstructure and mechanical properties of laser deposition repaired TA15 alloy

Researches on the laser deposition repairing of TA15 alloy forgings having groove damage were investigated, and the microstructure characteristic of laser deposition repairing component was analyzed. The repaired component experienced a continuous microstructural transition from duplex microstructure with equiaxial and lamellar / in the repaired substrate to the epitaxial coarser columnar with basket weave / through heat-affected zone. And the repaired zone was characterized by a fine / lamellar microstructure with various random orientations, and the was 0.4-0.5 m. It was found that large sloped angle could cause ill bonding along the groove side slope, and a corrective action was given to avoid this defects. The results of the repaired groove sample tensile test at room temperature show that tensile strength is approaching to the forged TA15 alloy, but its impact toughness is a little lower than that of the substrate for its coarser columnar .