Effect of processing parameters on formability, microstructure, and micro-hardness of a novel laser additive manufactured Ti-6.38Al-3.87V-2.43Mo alloy

A novel Ti-6.38Al-3.87V-2.43Mo alloy was designed with a cluster formula of 12[Al-Ti12] (V0.75Mo0.25Ti2)+4[Al-Ti12](Al3) by replacing Ti Mo/V on the basis Ti-Al congruent alloy. The effects laser power and scanning speed molten pool size, surface roughness, relative density, microstructure, micro-hardness single-track bulk samples prepared via additive manufacturing (LAM) were investigated. results show that processing parameters significantly affect formability, With decreasing from 1,900 W to 1,000 W, density is decreased 99.86% 90.91% due increase lack-of-fusion; however, increasing speed, does not change significantly, but exceeds 99%. In particular, exhibit good formability under an input 8 mm·s-1, display lowest roughness (Ra=13.33 µm) highest (99.86%). Besides, microstructure LAM coarsens or greater energy reducing cooling rate. coarsening decreases microhardness