Integration of phase-field model and crystal plasticity for the prediction of process-structure-property relation of additively manufactured metallic materials
Journal Article
·
· International Journal of Plasticity
- Hunan Univ., Changsha (China); Mississippi State Univ., Mississippi State, MS (United States)
- Univ. of Michigan, Dearborn, MI (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Mississippi State Univ., Mississippi State, MS (United States)
- Liberty Univ., Lynchburg, VA (United States)
- Hunan Univ., Changsha (China)
A computational framework is developed to investigate the process-structure-property relationship for additive manufacturing (AM) of Ti–6Al–4V alloy. Here, the proposed model incorporates experimentally informed two-phase α+β morphologies within prior β-grains, which are widely observed in the as-built AM components. Specifically, the temperature-dependent phase-field model (PFM) is used to simulate the evolution of various grain morphologies, e.g., columnar and equiaxed grain structures. The proposed PFM taking into account both of the epitaxial grain growth and the constitutional cooling-driven heterogeneous nucleation enables us to capture the columnar to equiaxed transition (CET) of grain structures. The thermal fields concerned with the scanning strategies and manufacturing parameters are simulated using a finite-element model (FEM). The Burgers orientation relation (BOR) is further utilized to generate two-phase α+β morphologies within prior β-grains, accompanied by the transformation of crystal orientations, i.e., (0001)α//{101}β and <$$11\bar{2}0$$>α//<111>β. Finally, a fast Fourier transform-based elasto-viscoplastic (EVP-FFT) model is employed to predict the micromechanical behaviors and properties for the two-phase α+β microstructures. The presented PFM-based formulation is generally applicable to predict the process-structure-property relationship for additive manufacturing of a variety of alloy systems, e.g., titanium alloys, aluminum alloys and nickel-based superalloys.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation of China; National Natural Science Foundation of China (NNSFC); National Key R&D Program of China
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1734720
- Report Number(s):
- LA-UR--19-31422
- Journal Information:
- International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 128; ISSN 0749-6419
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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