Study on thermal behavior and printing limit height of selective laser melting forming titanium alloy thin-walled parts
To study the thermal behavior of titanium alloy thin-walled parts under selective laser melting process and the influence of process parameters on the printing limit height,the theoretical modeling,simulation and orthogonal test method were used to study the thermal behavior and the printing limit height of titanium alloy thin-walled parts under the action of complex thermal cycle.The study was carried out from single-layer single-pass,single-layer multi-pass and multi-layer single-pass respectively.The simulation results show that for single-layer single-pass forming,when the laser beam moves from node N1 to node N3,the peak temperature of the molten pool and the maximum cooling rate increase gradually.For single-layer multi-pass forming,when the laser beam scans from the first pass to the third pass,the molten pool size and the peak temperature of the molten pool show a tendency to increase.For multi-layer single-pass forming,when the laser beam scans from the first layer to the fifth layer,the melten pool size shows an increasing trend.The test results show that the printing limit height is positively correlated with the laser power,negatively correlated with the scanning speed,first increases and then decreases with the increase of scanning spacing,and linearly increases with the la-ser energy density.
万方数据
维普
