|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||Microstructural Control in SLM Ti-6Al-4V: Key Factors Facilitating In Situ α Martensite Decomposition
||Wei Xu, Edward Wen Chiek Lui, Ma Qian, Milan Brandt
|On-Site Speaker (Planned)
α martensite is usually dominant in Ti-6Al-4V additively manufactured by SLM and it is not easily achievable to transform it in situ into more desired (α+β) microstructures in the current SLM practice. Such a metastable microstructure is problematic as it leads to inadequate mechanical performances at room temperature while affecting the structural stability under loading or impacting conditions in service. Consequently, post-SLM heat treatment is often necessary. This study is motivated to optimize the SLM processing windows to achieve preferred (α+β) microstructures in situ for superior mechanical properties. We show that, through a proper selection of the SLM processing parameters, it is practical to realise significant in-situ α' martensite decomposition for precise microstructural control to produce lamellar (α+β) microstructures with a tuneable α lath width in the range of 0.18-0.75 μm. A microstructure “fingerprint” for SLM Ti-6Al-4V has thus been proposed for its future additive manufacturing with desired mechanical properties.
||Planned: Supplemental Proceedings volume