The Relationship of Processing Parameters and Surface Topography of Selective Laser Melted GH4169 Alloy

摘要

Selective laser melting (SLM) technology based on powder bed has been used to manufacture GH4169 samples. In the present work, taking Ni-based powders of GH4169 as experiment material, the good technological parameters of SLM were determined by analyzing the effect of the laser electric current, the scan speed ,the laser pulse width, the laser light frequency, the push powder thickness, the scan interval and the scanning way on Single-layer single-channel scanning, single-layer multi-channel scanning and multi-level multi-channel scanning. The effects of process parameters on the powder formability was analyzed. The cross-sections morphology and density of the block specimen prepared under the different SLM process parameter were studied. The optimal process parameters were the scanning speed of 150 mm/min, the laser pulse width of 5.0 ms, the push powder thickness of 0.15 mm, the scanning current of 140 A, the laser light frequency of 12Hz and the scan interval of 0.25mm.