激光参数和扫描策略对选择性激光熔化TC11合金成形性能的影响  

Effects of laser parameters and scanning strategy on the forming properties of selective laser melting TC11 alloy

作　　者：谢琰军[1,2] 杨怀超[2] 王学兵[2] 况春江[1,2] 韩伟[1] XIE Yan-jun;YANG Huai-chao;WANG Xue-bing;KUANG Chun-jiang;HAN Wei(China Iron ＆ Steel Research Institute, Beijing 100081, China;Advanced Technology ＆ Materials Co., Ltd., Beijing 100081, China)

机构地区：[1]钢铁研究总院,北京100081 [2]安泰科技股份有限公司,北京100081

出　　处：《粉末冶金工业》2018年第2期18-24,共7页Powder Metallurgy Industry

基　　金：国家重点研发计划资助项目(2016YFB1101102,2016YFB1101100);国家国际科技合作专项资助项目(2015DFA50970)

摘　　要：采用选择性激光熔化技术制备了TC11合金试样,研究了激光参数和扫描策略对TC11合金成形性能的影响。结果表明：随着激光扫描速度的增加,合金表面黏附的金属球形颗粒增加,单道熔池宽度减小,试样表面变得粗糙。当激光扫描速度为0.6 m/s时,合金内部存在的孔隙为球形气孔;激光扫描速度大于1.2 m/s时,合金内部存在未熔不规则孔隙。随着激光功率的增加,单道熔池宽度增大,合金表面变得光滑;当激光功率不大于280 W时,样品内部存在极少量不规则未熔孔隙;激光功率为320 W时,样品内部存在极少量球形气孔。打印时采用每一层相对上一层旋转67°的扫描策略可以弥补上一层扫描时所造成的中心和边缘的高度差,避免高度差加大产生内部孔隙。为选择性激光熔化制备TC11合金选择合适的激光工艺参数和扫描策略提供了一定的参考依据。TC11 alloy samples were prepared by selective laser melting technology. The influence of laser parameters and laser scanning strategy on the forming properties of TC11 alloy was investigated. The results indicate that,with the increase of laser scanning speed,the metal spherical particles adhering to the alloy surface increase,the width of single scanning molten pool decrease,and the surface of the sample becomes much coarser. There are spherical pores exist in the sample when the laser scanning speed is 0.6 m/s,while there are irregular pores exist in the sample when the laser scanning speed is greater than 1.2 m/s. With the increase of laser power,the width of single scanning molten pool increase and the surface of the samples become much smoother. There are little small irregular pores inside the sample when the laser power is not higher than 280 W,while there are little small spherical pores inside the sample when the laser power is 320 W. The scanning strategy of each layer is rotated 67 degrees relative to the previous layer makes up for the height difference between the center and edge caused by the previous scanning layer,avoiding the height difference increase,thus avoiding the internal porosity. The research provides a basis for selecting appropriate laser parameters and scanning strategy for preparing TC11 alloy by selective laser melting.

关 键 词：选择性激光熔化 TC11 激光功率 扫描速度 扫描策略 

分 类 号：TG146.23[一般工业技术—材料科学与工程]