激光重熔对TC4选区激光熔化成形质量及力学性能的影响

Effect of Laser Remelting on Quality and Mechanical Properties of Selective Laser Melting of TC4

研究了激光重熔在选区激光熔化(SLM)制备TC4钛合金时对样件的成形质量以及力学性能等方面的影响。实验结果表明,随着激光重熔次数的增加,TC4样件的上表面质量和致密度逐渐改善,上表面粗糙度值和致密度分别由未重熔时的13.2μm和98.43%改善为重熔两次的8.7μm和99.23%,但是侧表面质量未有明显变化。随着激光重熔次数的增加,伸长率有所增加,由未重熔时的1.15%改善为重熔两次的1.33%,但是抗拉强度基本相同。通过对TC4样件的显微组织进行观察,发现激光重熔前后TC4样件的显微组织上均由针状马氏体α′相占据。

The effect of laser remelting on the forming quality and mechanical properties of sample components during the preparation of TC4 titanium alloy using selective laser melting(SLM)is examined.According to the experimental results,the upper surface quality and densities of TC4 samples improve with increasing laser remelting iterations,and the upper surface roughness and densities improve from 13.2μm and 98.43%without remelting to8.7μm and 99.23%with remelting twice,respectively.The side surface quality,however,does not alter considerably.The elongation increases and improves with laser remelting iterations,from 1.15%to 1.33%,but the tensile strength remains constant.Observing the microstructure of the TC4 sample,the acicular martensiteα′phase occupies the microstructure of the TC4 sample before and after laser remelting.