A physically-based computational approach for processing-microstructure-property linkage of materials additively manufactured by laser powder bed fusion
A physically-based computational approach for processing-microstructure-property linkage of materials additively manufactured by laser powder bed fusion
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DOI：
10.1016/j.ijmecsci.2022.107103
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发表时间：
2022-01
影响因子：
7.3
通讯作者：
V. Romanova;M. Mohebbi;E. Dymnich;R. Balokhonov;V. Ploshikhin
中科院分区：
文献类型：
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作者：
V. Romanova;M. Mohebbi;E. Dymnich;R. Balokhonov;V. Ploshikhin
提出了一种基于物理的方法来评价激光粉末床熔凝（L-PBF）制备AlSi 10 Mg合金的组织与性能的关系。该方法包括模拟加工过程中的微观组织演变及其变形行为的微观力学分析。将凝固过程的元胞自动机（CA）模型与传热过程的微分方程模型耦合，建立了三维凝固组织模型。CA模型基于合金的成核和生长特性，使得所产生的微观结构在晶粒结构和织构方面与实验很好地对准。采用晶体塑性（CP）有限元计算对代表性微观结构进行微观力学分析。顺序耦合的CA和CP模型提供了一种基于物理的方法来理解L-PBF产品的过程-结构-性能关系。模拟了沿着三个垂直方向的单轴拉伸，研究了晶粒组织的变形行为。应力和应变场分析表明，在晶粒尺度上的力学性能的本质各向异性。结果表明，在单轴拉伸条件下，材料的应力应变状态是复杂的，所有应力张量分量对变形行为的贡献是可比的。
A physically-based approach is proposed for evaluating the microstructure-to-property linkage of AlSi10Mg produced by Laser Powder Bed Fusion (L-PBF). The approach includes the simulation of the microstructure evolution during processing and subsequent micromechanical analysis of its deformation behavior. Three-dimensional microstructural model is simulated by coupling the Cellular Automata (CA) model of solidification and the Finite-Difference model of heat transfer. The CA model is based on the nucleation and growth characteristics of the alloy such that the generated microstructure is well aligned with the experiments in terms of the grain structure and texture. Micromechanical analysis for a representative microstructure is performed using Crystal Plasticity (CP) Finite-Element calculations. The sequentially coupled CA and CP models provide a physically-based approach for grain-scale understanding of process-structure-property relationship ofL-PBF products. Uniaxial tension along three perpendicular directions is simulated to investigate the deformation behavior of the grain structure. The stress and strain field analyses show an essential anisotropy of the mechanical properties at the grain scale. It is demonstrated that the stress-strain state of the material under uniaxial tension is complex and all stress tensor components make a comparable contribution to the deformation behavior.