选区激光熔化钴铬合金工艺-北京工业大学学报.pdfVIP

第41卷 第12期 北 京 工 业 大 学 学 报 Vol.41 No.12 2015年 12月 JOURNAL OF BEIJING UNIVERSITY OFTECHNOLOGY Dec. 2015 选区激光熔化钴铬合金工艺 刘富荣,赵进炎,窦摇 阳,王摇 颖,袁艳萍,陈继民 (北京工业大学 激光工程研究院,北京摇 100124) 摘摇 要:主要对单层钴铬合金SLM成型工艺进行研究,讨论了激光功率和扫描速度对于单道熔道宽度、形貌的影 响及熔道搭接率对于单层多道成型表面形貌的影响,确定合理的成型工艺选择范围. 研究发现:线能量渍 对熔道 成型质量和熔池宽度d 具有影响,当1郾22J/ mm渍2郾33J/ mm时可以获得连续规则、无粉区范围极小的熔道;通 m 过优化的工艺参数获得了线能量与熔宽的稳定拟合关系,为单层多道成型提供了数据支持;搭接率为35%时,相邻 熔道之间搭接紧密,重熔部分的膨胀高度合理,使单层多道成型表面粗糙度最低为5 滋m,可以获得光滑平整的 表面. 关键词:线能量;熔道宽度;搭接率;表面粗糙度;成型质量 中图分类号:TG665 文献标志码:A 文章编号:0254-0037(2015)12-1836-05 doi:10.11936/ bjutxb2015070038 Process of Co鄄Cr Alloy Fabricated by Selective Laser Melting LIU Fu鄄rong,ZHAOJin鄄yan,DOU Yang,WANG Ying,YUAN Yan鄄ping,CHENJi鄄min (Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China) Abstract:This paper studies the forming process of single鄄layercobalt鄄chromium alloys fabricated by selective laser melting.Thereasonableformingprocesswasdeterminedby discussingthe influencerule of laser power,scanning speed and overlap rate on the weld width and morphology. Results show that line energy 渍 has an impact on the molding quality and weld width d ,a continuous and regular weld pool m with a small range of powder free zone was obtained when 1郾22 渍 2郾33 J/ mm. A stable fitting relationship can be obtained between line energy and weld width with the optimized process parameters, which provides a reasonable reference for single multi鄄channel shaping. The adjacent cladding channels can be lapped closely when the overlap rate is35% with the surface roughness as low as5 滋m because the expansion heigh