Integrated modelling and simulation of NiTi alloy by powder bed fusion: Single track study

• DOI: 10.1016/j.matdes.2023.111755
• Publication Date: 2023-02-20T02:30:34Z
• Authors: Liang-Xing Lu; Hao Jiang; Qin Bian; Wenzhu Shao; Liyi Li; Yong-Wei Zhang; Bo Liang; YuSheng Shi; Liang Zhen
• Keywords: Keyhole; Molar absorptivity; Lattice Boltzmann methods

In-depth understanding of the layer-by-layer process is critical for quality control additive manufactured (AM) components. Besides development experimental techniques, computational modelling another important way to study AM mechanisms in detail. However, currently there still lack a platform that integrates all necessary physics involved process. In present study, we develop framework phase field method microstructure evolution, lattice Boltzmann melt pool dynamics, modified ray-tracing laser-material interaction, and minimum gravity energy algorithm powder bed generation simulate single-track, fusion (PBF) NiTi shape memory alloy. Our simulation shows different from keyhole depth, size does not obey scaling law with line density, depth overlapping ratio laser spot vs. opening together determine absorptivity. Based on finding, also self-consistent analytical model predict absorptivity given scanning parameters. The work lays solid foundation towards quantitative multi-layer