工艺参数对SLM成形CuCrZr合金微流道粗糙度的影响  

Influence of process parameters on micro-channel roughness of SLM forming CuCrZr alloy

作　　者：何国豪 劳子彬 甘宏海 曹明轩 付斌 刘志平 王颖 袁铭辉[3] HE Guohao;LAO Zibin;GAN Honghai;CAO Mingxuan;FU Bin;LIU Zhiping;WANG Ying;YUAN Minghui(Department of Intelligent Manufacturing,Wuyi University,Jiangmen 529020,China;College of Applied Physics and Materials,Wuyi University,Jiangmen 529020,China;Department of Machinery and Aerospace,The Hong Kong University of Science and Technology,Hong Kong 999077,China)

机构地区：[1]五邑大学智能制造学部,江门529020 [2]五邑大学应用物理与材料学院,江门529020 [3]香港科技大学机械及航空航天系,中国香港999077

出　　处：《激光技术》2023年第5期639-645,共7页Laser Technology

基　　金：广东省重点领域研发计划资助项目(2020B090922004);粤港澳联合研发基金资助项目(2019WGALH22)。

摘　　要：为了研究工艺参数对激光选区熔化技术成形的CuCrZr合金微流道表面粗糙度的影响,采用正交试验法制备了具有微流道的CuCrZr合金试样;利用3维形貌仪和扫描电子显微镜测试样件内表面的粗糙度和微观形貌,分析了激光功率、扫描速率、填充距离对微流道悬垂面及侧表面的粗糙度的影响规律和内在机制。结果表明,扫描速率对于悬垂面和侧表面的粗糙度影响最大,悬垂面受熔池自身质量影响而出现“挂渣”现象,而侧表面粗糙度则受马兰戈尼效应的影响较大;经过优化,在激光功率380 W、扫描速率520 mm/s、扫描间距0.12 mm的工艺参数下,可加工获得具有最小侧表面粗糙度(16.91μm)的微流道样件;在激光功率320 W、扫描速率560 mm/s、填充距离0.14 mm的工艺参数下,可加工获得具有悬垂面最小粗糙度(24.86μm)的微流道样件。该研究从激光工艺窗口的角度为激光选区熔化技术成形表面精度提供了依据。In order to study the effect of process parameters on the surface roughness of CuCrZr alloy micro-channel formed by selective laser melting(SLM)technology,CuCrZr alloy sample with micro channel was prepared by orthogonal experiment.The roughness and micro morphology of the inner surface of the sample were measured by 3-D topography instrument and scanning electron microscope.The effects of laser power,scan speed and hatch distance on the surface roughness of the overhang surface and side surface of the microchannel were analyzed.The results show that the scan speed has the greatest influence on the roughness of the overhang and side surfaces,and the overhang surface is affected by the quality of the molten pool itself,resulting in the phenomenon of“slag hanging”;while the side surface roughness is greatly affected by the Marangoni effect.After optimization,under the process parameters of laser power 380 W,scan speed 520 mm/s,and hatch distance 0.12 mm,micro-channel samples with minimum side surface roughness(16.91μm)can be processed;laser power is 320 W,scan speed is 560 mm/s,under the process parameters of 0.14 mm hatch distance,the micro-channel sample with the smallest overhang surface roughness(24.86μm)was obtained.This research provides the basis for SLM forming surface precision from the perspective of laser processing window,and gives the preliminary process parameter scheme.

关 键 词：激光技术 表面粗糙度 工艺参数 铜铬锆合金 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]