Three-dimensional modeling of the microstructure evolution during metal additive manufacturing
Three-dimensional modeling of the microstructure evolution during metal additive manufacturing
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DOI：
10.1016/j.commatsci.2017.09.018
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发表时间：
2018
影响因子：
3.3
通讯作者：
O. Zinovieva;A. Zinoviev;V. Ploshikhin
中科院分区：
文献类型：
--
作者：
O. Zinovieva;A. Zinoviev;V. Ploshikhin
预测增材制造材料的微观结构是一个重要的研究热点，以面对生产定制组件的挑战。在这项工作中，开发了一个三维数值模型，以评估金属增材制造过程中晶粒结构演变的基本原理。元胞自动机和有限差分方法耦合来预测晶粒结构，取决于增材制造过程中的瞬态温度场。研究了选择性激光熔化工艺，该工艺利用高能量密度激光束通过熔化金属粉末来制造高度复杂形状的零件。预测的晶粒结构与实验数据一致。结果表明，在选择性激光熔化和晶粒选择与竞争性质的晶粒生长的特定的凝固条件下，促进粗柱状晶粒的发展，最有利的生长方向与构建方向不一致。这导致形态学和晶体学纹理。
Prediction of microstructures of additive manufactured materials is a significant research focus to face the challenge of producing tailored components. In this work, a three-dimensional numerical model is developed to evaluate fundamentals of grain structure evolution during metal additive manufacturing. Cellular automata and finite difference methods are coupled to predict the grain structure, depending on a transient temperature field during the additive manufacturing process. Selective laser melting process that makes use of a high energy density laser beam to produce parts of highly complex shape by melting of metallic powder is examined. The predicted grain structure is consistent with the experimental data. The results obtained show that specific solidification conditions in selective laser melting and grain selection associated with competitive nature of grain growth promote the development of coarse columnar grains with the most favorable growth direction misaligned with the build direction. This results in morphological and crystallographic texture.