Influence of Post Heat Treatment on Microstructure and Mechanical Property of Ti6Al4V Parts Produced by Selective Laser Melting

Abstract:

A preliminary investigation of the post heat treatment for Ti6Al4V tensile specimens fabricated via selective laser melting (SLM) are reported. The resultant microstructure and mechanical behavior at room temperature, normal and parallel to the building direction, was investigated in detail. Moreover, the as-prepared samples were compared with the samples post heat treated at 600°C~800°C for 2 h. It was found that the SLM fabricated samples consisted of long columnar original β grains together with parallel acicular α' martensitic structure dominated in the β matrix, which was observed in the side view, and fully equaixed β grains pattern in the top view. The post heat treatment did not completely disrupt the layered structure, but leading to the acicular α' martensites decomposing into α platelets distributed in a metastable β matrix. Ultimate tensile strength and elongation were analyzed and explained based on the microstructure evolution. After post heat treatment, an increase in elongation was observed for the tensile samples, inducing more ductile like morphology after fracture.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1312-1317
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1312
• Online since: June 2017
• Authors: Hong Yu Ding, Pei Kun Qiu, Yuan Fei Han, Zhong Gang Sun, Jie Huang, Ming Qiang Chu, Wei Jie Lu*
• Keywords: Heat Treatment, Mechanical Properties, Microstructure, Selective Laser Melting, Titanium Alloy

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