Deng Chengyang, Kang Jinwu, Feng Tao, Feng Yunlong, Wang Xiang, Wu Pengyue
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Beijing e-Plus 3D Tech. Co. Ltd., Beijing 100084, China.
Materials (Basel). 2018 Apr 17;11(4):614. doi: 10.3390/ma11040614.
The selective laser melting of tin bronze (CuSn) powder was performed with a laser energy density intensity level at 210, 220, and 230 J/mm². The composition was homogeneous with almost all tin dissolved into the matrix. The grain size of the obtained alpha copper phase was around 5 μm. The best properties were achieved at 220 J/mm² laser energy density with a density of 8.82 g/cm³, hardness of 78.2 HRB (Rockwell Hardness measured on the B scale), yield strength of 399 MPa, tensile strength of 490 MPa, and an elongation that reached 19%. “Balling effect” appeared and resulted into a decrease of properties when the laser energy density increased to 230 J/mm².
采用激光能量密度强度水平分别为210、220和230J/mm²的条件对锡青铜（CuSn）粉末进行选择性激光熔化。其成分均匀，几乎所有的锡都溶解到了基体中。所获得的α铜相的晶粒尺寸约为5μm。在激光能量密度为220J/mm²时获得了最佳性能，密度为8.82g/cm³，硬度为78.2HRB（B级洛氏硬度），屈服强度为399MPa，抗拉强度为490MPa，伸长率达到19%。当激光能量密度增加到230J/mm²时，出现了“球化效应”，导致性能下降。
