The temperature and stress profiles of porous cubic Ti-6Al-4V titanium alloy grids by additive manufacturing via electron beam melting (EBM) based on finite element (FE) method were investigated. Three-dimensional FE models were developed to simulate the single-layer and five-layer girds under annular and lateral scanning. The results showed that the molten pool temperature in five-layer girds was higher than that in single-layer grids owing to the larger mass and higher heat capacity. More energies accumulated by the longer scanning time for annular path than lateral path led to the higher temperature and steeper temperature gradient. The thermal stress drastically fluctuated during EBM process and the residual stress decreased with the increase of powder layer where the largest stress appeared at the first layer along the build direction. The stress under lateral scanning was slightly larger but relatively more homogeneous distribution than those under annular scanning. The stress distribution showed anisotropy and the maximum Von Mises stress occurred around the central node. The stress profiles were explained by the temperature fields and grids structure.

研究了基于有限元（FE）方法通过电子束熔化（EBM）增材制造的多孔立方Ti-6Al-4V钛合金网格的温度和应力分布。开发了三维有限元模型来模拟环形和横向扫描下的单层和五层网格。结果表明，由于较大的质量和较高的热容，五层网格的熔池温度高于单层网格的熔池温度。环形路径的扫描时间比横向路径的扫描时间更长，因此积累的能量更多，从而导致温度升高和温度梯度变大。EBM过程中，热应力剧烈波动，残余应力随粉末层的增加而降低，其中最大应力出现在沿构造方向的第一层。横向扫描下的应力比环形扫描下的应力稍大，但分布相对均匀。应力分布显示出各向异性，并且最大的Von Mises应力出现在中心节点周围。应力分布由温度场和网格结构解释。