Study on selective laser melting and heat treatment of Ti-6Al-4V alloy

Publication date: Available online 17 July 2018Source: Results in PhysicsAuthor(s): Fan Zhechao, Feng HongweiAbstractThe effects of process parameters of laser additive manufacturing (laser power, scanning speed, scanning direction) and heat treatment on the microstructure and properties of Ti-6Al-4V titanium alloy forming parts were studied under coaxial powder feeding. The results show that the columnar crystals of the Ti-6Al-4V forming parts made by laser material are all wechsler structure, and there are obvious layers in the layer; The strength of laser reinforced Ti-6Al-4V titanium alloy parts exceeds the requirements of national standard for as cast and forged Ti-6Al-4V titanium alloy; With the increase of laser power, the tensile strength and yield strength of Ti-6Al-4V titanium alloys tend to increase first and then decrease, and the maximum value is obtained when the laser power is 500 W; When the scanning speed increased from 0.12 m/min to 0.60 m/min, the tensile strength and yield strength of the Ti-6Al-4V titanium alloy showed a gradual decrease, but the elongation gradually increased; When the laser scanning mode is changed from single sweep to round-trip scanning, the tensile strength and yield strength of Ti-6Al-4V titanium alloy have been improved, but the elongation has decreased significantly. Through the solution and aging heat treatment at 950°C/AC/1h+540°C/AC/4h, the original wechsler structure can be improved and the high performance net basket organi...

Source: Results in Physics - July 17, 2018 Category: Physics Source Type: research