Effect of heat treatment on the formed specimen of TC4 titanium alloy by selective laser melting variable parameter forming process

Abstract In this paper, Ti-6Al-4 V (TC4 titanium alloy) specimens were prepared by a new process, the variable parameter forming process (VPFP) of selective laser melting (SLM) technology. The surface morphology, tensile properties, and microstructure of the TC4 titanium alloy specimen were investig...
Ausführliche Beschreibung

Abstract In this paper, Ti-6Al-4 V (TC4 titanium alloy) specimens were prepared by a new process, the variable parameter forming process (VPFP) of selective laser melting (SLM) technology. The surface morphology, tensile properties, and microstructure of the TC4 titanium alloy specimen were investigated. The test results showed that within the 250–300 W of laser power, the tensile strength of VPFP was larger than the quantitative parameter forming process (QPFP). However, the elongation was decreased. By decreasing the index of the hierarchy, the tensile strength increases, reaching 1190.84 MPa. Compared with the specimen without heat treatment, the elongation increases to more than 200%, and the maximum elongation reached 13%. By increasing the heat treatment temperature, the fracture gradually changes from brittle fracture to ductile fracture, and the main metallographic structure of the specimen was gradually transformed from acicular martensite α′ to α phase. This study provides new processes for SLM. Ausführliche Beschreibung