Defect, microstructure, and mechanical property of Ti-6Al-4V alloy fabricated by high-power selective laser melting

Sheng Cao, Zhuoer Chen, Chao Voon Samuel Lim, Kun Yang, Qingbo Jia, Tom Jarvis, Dacian Tomus, Xinhua Wu

Research output: Contribution to journalArticleResearchpeer-review

23 Citations (Scopus)

Abstract

To improve the selective laser melting (SLM) productivity, a high laser power and accordingly adjusted parameters are employed to facilitate a high build rate. Three distinct processing strategies with incremental build rate are developed for SLM Ti-6Al-4V. Various types of defects are investigated. Further studies were carried out by heat-treatment and hot isostatic pressing to evaluate the influence of microstructure and porosity on mechanical properties. The anisotropic mechanical property in horizontally and vertically build samples were observed, which was attributable to the columnar grains and spatial arrangement of defects. Regardless of anisotropy, a post-SLM heat-treatment at 800°C for 2 h produces a combined high strength and ductility.

Original languageEnglish
Pages (from-to)2684-2692
Number of pages9
JournalJOM
Volume69
Issue number12
DOIs
Publication statusPublished - 2017

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