| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Hierarchical Microstructure in Additively Manufactured Ti-6Al-4V and its Effect on Mechanical Properties |
| Author(s) |
Jinyeon Kim, Jenniffer Bustillos, Atieh Moridi |
| On-Site Speaker (Planned) |
Atieh Moridi |
| Abstract Scope |
The complex relationship between Additive Manufacturing (AM) process parameters, microstructure, and resultant properties needs to be fully understood for its widespread use. In this study, selective laser melting is used to print Ti-6Al-4V. In-situ tensile tests with concurrent detailed microstructural analysis are performed. Our results show that the as-printed part develops a hierarchical microstructures, consisting of primary, secondary, and tertiary α' martensite as a result of cyclic heat treatment during selective laser melting. Upon deformation, strain localization within primary α' martensite results in microscopic ductile micro-void formation and coalescence, as well as macroscopic brittle fracture. In addition to localization inside primary α', surface steps at the boundaries of these high aspect ratio grains are formed which reveal the contribution of interfacial plasticity to the overall deformation of the material. Post Hot Isostatic Pressing (HIP) is performed on the samples and its effect on microstructure and mechanical properties is discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |