Characterization of Ti-48Al-2Cr fabricated by multi-wire arc additive manufacturing: Microstructure, mechanical, and oxidation resistance properties

Abstract

Utilizing a multi-wire arc additive manufacturing process applied with high-frequency induction heating wire technology (MWAAM-HF) proposed in this study, Ti-48Al-2Cr alloy straight-walled component was fabricated. During the MWAAM-HF process, three types of wires melt simultaneously and transfer smoothly into the weld pool to form satisfactory component without discernible cracks. The upper and lower regions have higher hardness compared to the middle region in both Z and Y direction. Along the Y direction, the upper region exhibited the highest UTS and YS, while the minimum values were observed along the Z direction. Superior wear resistance was observed in the upper and lower regions. Distinct regions exhibited different levels of high-temperature oxidation resistance and the upper region has superior high-temperature oxidation resistance.