不同熔覆厚度下金属熔丝增材制造应力应变分析

Stress and strain analysis of metal additive manufacturing with different cladding thickness

以金属钛合金丝材Ti6A14V为研究对象,建立高斯面热源有限元分析模型,对不同熔覆厚度进行模拟仿真,研究分析Ti6A14V增材制造过程中的单道单层温度场、应力场变化,寻找出最优的方案并进行实验验证。结果表明:Ti6A14V工件在制造过程中存在较大的温度场梯度,而且随着成形厚度的增加,工件内部热量积累和应力现象明显降低;在冷却过程中,基板与第一道成形层处容易产生应力集中,其产生的纵向应力在残余应力的分布中占主导地位。此研究结果可为金属Ti6A14V熔丝增材制造的工艺参数优化提供理论依据。

Taking titanium alloy wire Ti6A14V as the research object,the finite element analysis model of Gaussian surface heat source is established,and the simulation of different cladding thickness is carried out.The results show that there is a significant temperature field gradient in the manufacturing process of Ti6A14V workpiece.With the increase of forming thickness,the internal heat accumulation and stress phenomenon of the workpiece are significantly reduced;During the cooling process,stress concentration is prone to occur between the substrate and the first forming layer,and the longitudinal stress generated by it dominates the distribution of residual stress.This research result can provide a theoretical basis for optimizing the process parameters of Ti6A14V metal fuse additive manufacturing.