Heat transfer and material flow during laser assisted multi-layer additive manufacturing
Heat transfer and material flow during laser assisted multi-layer additive manufacturing
复制标题
DOI：
10.1063/1.4896751
复制
发表时间：
2014-09-28
影响因子：
3.2
通讯作者：
DebRoy, T.
中科院分区：
文献类型：
--
作者：
Manvatkar, V.;De, A.;DebRoy, T.
建立了同轴喂料奥氏体不锈钢粉末激光辅助多层增材制造的三维瞬态传热和流体流动模型。激光束和粉末颗粒在喷嘴和生长表面之间的飞行过程以及粉末颗粒沉积在表面后的传热都被考虑在内。将独立实验得到的构建层几何形状与模型得到的几何形状进行了比较。在不同的层中，研究了熔体几何形状、冷却速率和峰值温度的空间变化。计算得到的冷却速率和凝固参数可用于估算组织各层的晶胞间距和硬度。计算的几何形状、单元间距和硬度与相应的独立实验结果吻合良好。(C) 2014 AIP出版有限责任公司
A three-dimensional, transient, heat transfer, and fluid flow model is developed for the laser assisted multilayer additive manufacturing process with coaxially fed austenitic stainless steel powder. Heat transfer between the laser beam and the powder particles is considered both during their flight between the nozzle and the growth surface and after they deposit on the surface. The geometry of the build layer obtained from independent experiments is compared with that obtained from the model. The spatial variation of melt geometry, cooling rate, and peak temperatures is examined in various layers. The computed cooling rates and solidification parameters are used to estimate the cell spacings and hardness in various layers of the structure. Good agreement is achieved between the computed geometry, cell spacings, and hardness with the corresponding independent experimental results. (C) 2014 AIP Publishing LLC.