|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||Grain Structure Engineering for Metal Additive Manufacturing
||Fuyao Yan, Wei Xiong, Gregory B. Olson
|On-Site Speaker (Planned)
The engineering application of additively manufactured alloys is closely related to microstructure optimization in materials and process design. Due to the extremely high thermal gradient during laser melting, it is easy for grains to grow epitaxially along the build direction into columnar structures resulting in undesired anisotropic properties, which degrade materials performance in applications. In this study, the primary object is to control and optimize grain structure in several alloys prepared by laser melting, such as austenitic steels, martensitic steels and titanium alloys. The approach for impeding grain growth in as-fabricated alloys is to introduce Zener-pinning particles, which are designed to form during rapid solidification and thereafter pin grain boundaries during multiple heating and cooling cycles. For martensitic steels, it is also possible to perform cyclic post heat treatment to promote recrystallization.
||Planned: Supplemental Proceedings volume