|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Multi-scale Phase-field Modeling of Microstructure Evolution of Additively Manufactured Metals
||Lei Chen, Zhuo Wang
|On-Site Speaker (Planned)
We propose a multi-scale computational framework to predict the microstructure evolution of Ti-6Al-4V alloy during additive manufacturing: (i) macroscopic finite element calculations for temperature distribution and thermal history; (ii) grain-scale phase-field model for solidification and grain growth; (iii) sub-grain-scale phase-field model for β→α phase transformations. Upon the experimental validation, the proposed model predicts the <001>β // NZ columnar grain structure along the build direction in the bulk section, as well as the inward columnar curved β-grain structure in the skin layer. The underlying mechanism of these behaviors is demonstrated to be attributed to the competition and collaboration between the thermal gradient and the crystallographically preferred grain orientations during a layer-by-layer fabrication. The analysis of printing parameters is then used to tailor the manufacturing conditions to achieve site-specific grain structure control. The attempt to combine phase-field model and crystal plasticity is also made to simulate the recrystallization for columnar grain refinement.
||Planned: Supplemental Proceedings volume