Microstructural evolution and mechanical property of Ti-6Al-4V wall deposited by continuous plasma arc additive manufacturing without post heat treatment

Deposited Ti-6Al-4V wall by optimized weld wire-feed continuous plasma arc additive manufacturing process (CPAM) consisted of various morphologies with different microstructure. The evolution of microstructures, including prior β grains, horizontal layer bands, martensite and basket weave microstructure, relate to gradually decrease heat input of layer by layer and multiple thermal cycles. The microstructure of α lamellar with nano-dispersoids significantly improve the mechanical properties without post-processing heat treatments, moreover, the mechanical properties exceed the standard level of forging.364