Eskandari Sabzi Hossein, Rivera-Díaz-Del-Castillo Pedro E J
Department of Engineering, Lancaster University, Gillow Ave, Bailrigg, Lancaster LA1 4YW, UK.
Materials (Basel). 2019 Nov 18;12(22):3791. doi: 10.3390/ma12223791.
A model to predict the conditions for printability is presented. The model focuses on crack prevention, as well as on avoiding the formation of defects such as keyholes, balls and lack of fusion. Crack prevention is ensured by controlling the solidification temperature range and path, as well as via quantifying its ability to resist thermal stresses upon solidification. Defect formation prevention is ensured by controlling the melt pool geometry and by taking into consideration the melting properties. The model's core relies on thermodynamics and physical analysis to ensure optimal printability, and in turn offers key information for alloy design and selective laser melting process control. The model is shown to describe accurately defect formation of 316L austenitic stainless steels reported in the literature.
提出了一种预测可打印性条件的模型。该模型侧重于防止裂纹，以及避免形成诸如匙孔、球状物和未熔合等缺陷。通过控制凝固温度范围和路径，以及量化其在凝固时抵抗热应力的能力来确保防止裂纹。通过控制熔池几何形状并考虑熔化特性来确保防止缺陷形成。该模型的核心依赖于热力学和物理分析以确保最佳可打印性，进而为合金设计和选择性激光熔化过程控制提供关键信息。结果表明，该模型能够准确描述文献中报道的316L奥氏体不锈钢的缺陷形成情况。
