Abstract
In this study, powder bed fusion Ti-6Al-4V alloy flake was subjected to heat treatment at 800 °C for 4 h for inducing the complete transformation of the α’ phase into the α+β phases. An erosion experiment with 450 µm mean particle diameter of Al2O3 particles at a 90° impact on both the as- powder bed fusion (PBF) Ti-6Al-4V and the 4-h 800 °C heat-treated specimens to clarify the particle erosion-induced phase transformation behavior and its effect on mechanical properties. Particle erosion-induced phase transformation to the α phase was observed on both the as-PBF Ti-6Al-4V and the heat-treated specimens. It brought about a sequential formation from the surface to the bottom: (1) a surface softened zone, (2) a hardened zone, and (3) a hardness stabilization zone. The as-PBF Ti-6Al-4V was positively eroded by erosion particles, decreasing strength and ductility. In the case of the heat-treated specimens, we found decreased strength yet an increased ductility.
Highlights
Titanium alloys are widely applied in environments susceptible to erosion, including blades, turbines, and desalination pipeline [1]
The heat affected the composite effect of particle erosion, and the erosion
Thetensile ratio of the new α phase induced by particle erosion in became higher than that in HTE, strength gradually decreased
Summary
Titanium alloys are widely applied in environments susceptible to erosion, including blades, turbines, and desalination pipeline [1]. We want to clarify the erosion-induced phase transformation mechanism and its effect on the tensile mechanical properties in this study. The chemical composition values of as-PBF Ti-6Al-4V measured by the Inductively cutting and did not go through any post-treatment before the implemented tests. The specimens were removed from support by electrical discharge machining (EDM) wire atmosphere at 800 ◦ C and was subjected to air cooling (labeled HT).
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