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Multi-scale modelling of solidification and microstructure evolution in laser- deposition of T15 high speed steel

机译：T15高速钢激光沉积过程中凝固和组织演变的多尺度建模

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摘要

Laser powder deposition (LPD) process is used in additive manufacturing for powder deposition of metal alloys, it involves parts building and re-manufacturing. However, this process is subjected to high cooling rates and rapid solidification hence the prediction of solidifying microstructure becomes challenging. In order to model the solidification process of the LPD of single track T15 steel, a phase field model (PFM) was proposed coupled with a nucleation, phase transition and heat transfer models. This model was employed to simulate the different microstructure phases and solute distribution. Further, a level set volume of fluid (LS-VOF) model was used to calculate the cooling rate and thermal gradient of the melt pool where these variables are subsequently used as a comparison with the PFM. PF results showed two main phases of microstructure identified as cellular and equiaxed which evolved as solidification took place. The results were compared to thermal analysis and experimental results. Experimental analysis showed cellular microstructure dominated at the substrate-track interface and equiaxed microstructure in the remainder of the track. The grains size distribution obtained from PFM at different location in the track was compared to Scanning electron microscopy (SEM) imaging. The paper showed that the proposed PFM is a promising tool for microstructure prediction in LPD process.
机译：激光粉末沉积（LPD）工艺用于金属合金粉末沉积的增材制造中，涉及零件制造和再制造。然而，该过程经受高冷却速率和快速凝固，因此，凝固组织的预测变得具有挑战性。为了模拟单轨T15钢的LPD的凝固过程，提出了相场模型（PFM），并结合了成核，相变和传热模型。该模型用于模拟不同的微观结构相和溶质分布。此外，使用液位设定体积（LS-VOF）模型来计算熔池的冷却速率和热梯度，随后将这些变量用作与PFM的比较。 PF结果表明，微观结构的两个主要阶段被确定为蜂窝状和等轴状，并随着凝固而发展。将结果与热分析和实验结果进行比较。实验分析表明，细胞微结构在底物-轨道界面处占主导，等轴微结构在轨道的其余部分中。从PFM在轨迹的不同位置获得的晶粒尺寸分布与扫描电子显微镜（SEM）成像进行了比较。本文表明，所提出的PFM是用于LPD过程中的微结构预测的有前途的工具。

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  • 来源
    《Journal of Manufacturing Processes》 |2020年第2期|24-33|共10页
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    Tsinghua Univ State Key Lab Tribol & Inst Mfg Engn Dept Mech Engn Beijing 100084 Peoples R China|Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518055 Peoples R China;

    Tsinghua Univ State Key Lab Tribol & Inst Mfg Engn Dept Mech Engn Beijing 100084 Peoples R China;

    Worcester Polytech Inst Dept Mech Engn Worcester MA 01609 USA;

    Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518055 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Laser powder deposition; T15 steel; Rapid solidification; Phase field; Nucleation; Level set-volume of fluid model;

    机译：激光粉末沉积;T15钢;快速凝固;相场成核;流体模型的水平设定体积;

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