Multi-Scale modelling of structure-property relationship in additively manufactured metallic materials. (15th March 2021)

• Record Type: Journal Article
• Authors: Tang, Haibin; Huang, Haijun; Liu, Changyong; Liu, Zhao; Yan, Wentao
• Is Part Of: International journal of mechanical sciences. Volume 194(2021)
• Publication Date: 2021-03-15
• Subjects: Additive manufacturing -- Metallic material -- Structure-property relationship -- Crystal plasticity -- Reconstruction -- Ti-6Al-4V; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2020.106185
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: A new synthetic microstructure generation approach is proposed for AMed metals according to the characteristics of grain growth in the fabrication process. The constitutive relation of individual grains is provided by the single-crystal-scale plasticity model. To reduce the computational cost, a polycrystal-scale plasticity model is also established. The homogeneous elastic moduli tensor is computed based on Mori-Tanaka's theory, while the plastic deformation is described by the equivalent grain set. Abstract: This paper presents a multi-scale modelling framework to evaluate the structure-property relationship of metallic materials fabricated by powder-bed additive manufacturing (AM) technique based on crystal plasticity finite element methods. In this framework, a new synthetic microstructure generation approach is proposed to reconstruct micro-scale models of AMed metals according to the characteristics of grain growth in the fabrication process. The constitutive relation of individual grains in the micro-scale reconstructed models is described with the single-crystal-scale plasticity model. Meanwhile, to reduce the computational cost, a polycrystal-scale plasticity model is also established. The homogeneous elastic moduli tensor is computed according to Mori-Tanaka's theory, while the plastic deformation is described by the equivalent grain set. The proposed multi-scale modelling framework is validated against experiments, where the as-built Ti-6Al-4V samples fabricated by selective laser melting (SLM) are tested under uniaxial tensile, compressive, and cyclic loadings. The presented experimental and computational study demonstrates the capability of the proposed multi-scale modelling framework in the structure-property analysis of AMed metals. Graphical abstract: Image, graphical abstract