热累积效应对选区激光熔化钴铬合金组织和性能的影响

Effect of Thermal Accumulation on Microstructure and Mechanical Properties of Selective Laser Melting Cobalt-Chromium Alloy

为研究选区激光熔化成形过程中热累积效应对0°和90°两种构建方向性能的影响,在ANSYS模拟熔池尺寸和热累积效应的基础上,通过试验分析0°和90°两种构建方向的熔池尺寸、致密度、XRD、微观组织和力学性能的差异。结果表明,在相同体能量密度条件下,垂直构建成形件的热累积效应要高于水平构建成形件,使其熔池尺寸和γ相含量高于水平构建成形,进而使两种构建方向成形件致密度和力学性能产生差异;同时,由于热累积效应的影响,垂直构建成形件的γ相含量随成形高度的变化而变化。

In order to investigate the thermal accumulation effect on the properties of two build directions of 0°and 90°during the selective laser melting.Based on the ANSYS simulation of molten pool size and thermal accumulation effect,the mechanical properties of the two build-formed parts were explored experimentally,and the differences in melt pool size,density,XRD,microstructure and mechanical properties between 0°and 90°build directions were analyzed.Results show that the thermal accumulation of the vertical build-formed parts is higher than that of the horizontal build-formed parts under the same bulk energy density,which results in higher melt pool size andγ-phase content than that of the horizontal build-formed parts,and thus the difference in the densities and mechanical properties between the two build-formed parts.Due to the effect of heat accumulation,theγ-phase content of different forming parts of the vertical build forming parts changes.