Effects of selective laser melting parameters on surface quality and densification behaviours of pure nickel  

工艺参数对激光选区熔化成形纯镍表面质量及致密化行为的影响

作　　者：Tian-yang YUE Sheng ZHANG Chao-yue WANG Wei XU Yi-di XU Yu-sheng SHI Yong ZANG 岳天洋;张升;王超越;徐伟;徐一镝;史玉升;臧勇(北京科技大学机械工程学院,北京100083;北京科技大学顺德研究生院,佛山528300;北京科技大学材料科学与工程学院,北京100083;北京科技大学工程技术研究院,北京100083;华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室,武汉430074)

机构地区：[1]School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Shunde Graduate School,University of Science and Technology Beijing,Foshan 528300,China [3]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]Institute for Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China [5]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2634-2647,共14页中国有色金属学报（英文版）

基　　金：financially supported by the Scientific and Technological Innovation Foundation of Foshan,China (No.BK20BE011);the Fundamental Research Funds for the Central Universities,China (No.FRF-GF-20-10B)。

摘　　要：The effects of laser power and scanning speed on the forming characteristic of scanning tracks,densification behaviours and surface roughness of pure nickel fabricated with selective laser melting(SLM)were studied.The results indicate that the scanning tracks showed continuous,regular and flat surface with increasing laser power and decreasing scanning speed in a specific range,which could avoid the defects(like holes and balling structures)forming in SLM processing.The optimal process window was identified as the scanning speed of 900 mm/s and the laser power of 255−275 W by comparing the surface qualities and densification behaviours.With the suitable processing parameters,the relative density could achieve 99.16%,the tensile strength was(359.49±2.74)MPa,and the roughnesses of the top and side surfaces were(12.88±2.23)and(14.98±0.69)μm,respectively.研究激光功率和扫描速度对激光选区熔化(SLM)成形纯镍的熔覆道特征、致密化行为和表面粗糙度的影响规律。结果表明,在一定范围内提升激光功率并降低扫描速度,可成形出连续、规则、光滑的熔覆道,这有助于抑制SLM成形过程中孔隙、球化等缺陷的形成。当扫描速度为900 mm/s、激光功率为255~275 W时可获得最佳成形工艺窗口,此时,试样相对密度为99.16%,抗拉强度为(360±2.747)MPa,上表面和侧表面的粗糙度分别为(2.88±2.23)μm和(14.98±0.69)μm。

关 键 词：selective laser melting pure nickel scanning track DENSIFICATION surface roughness 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.15[一般工业技术—材料科学与工程]