Numerical model of heat transfer during laser powder bed fusion of 316L stainless steel
Numerical model of heat transfer during laser powder bed fusion of 316L stainless steel
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DOI：
10.1007/s00170-021-08352-0
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Bryce Cox;M. Ghayoor;R. Doyle;S. Pasebani;J. Gess
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作者：
Bryce Cox;M. Ghayoor;R. Doyle;S. Pasebani;J. Gess
激光粉末床熔合（LPBF）工艺可用于制造使用传统方法无法制造的独特设计的部件。LPBF的能力可以通过引入金属基复合材料来扩展，以在所创建的部件中实现特定的性能增强，但是存在技术和成本挑战，阻碍了该工艺的发展和进步。需要进一步了解LPBF过程中发生的基本热和流体动力学机制，以克服这些挑战并最大限度地降低这些进步的成本。在这项研究中，建立了LPBF过程的数值模型，并用于探索这些基本机制之间的关系。利用MATLAB建立了一个三维瞬态有限差分数值传热模型，预测了整个LPBF过程中316L不锈钢的温度和状态（粉末、液体或固体）。金属粉末的有效热导率使用激光脉冲法测量用于模型中。模型结果进行比较，单轨道样本创建LPBF。熔池面积的模型结果显示出良好的一致性与物理样品。
The laser powder bed fusion (LPBF) process can be used to manufacture parts of unique design that cannot be manufactured using classical methods. The capabilities of LPBF can be expanded upon by introducing metal matrix composites to attain specific property enhancements in the created part, but technical and cost challenges exist that impede the development and advancement of this process. Further understanding of the fundamental thermal and fluid dynamic mechanisms that occur during the LPBF process is required to overcome the challenges and minimize the cost of these advancements. For this study, a numerical model of the LPBF process is created and used to explore relationships between these fundamental mechanisms. A three-dimensional, transient, finite difference numerical heat transfer model is created using MATLAB to predict the temperature and state (powder, liquid, or solid) of 316L stainless steel throughout the LPBF process. The effective thermal conductivity of the metal powder was measured using a laser pulse method for use in the model. Model results are compared to single track samples created with LPBF. The model results for melt pool area show good agreement with the physical samples.