选择性激光烧结PA6样品的力学性能研究  

Investigation on the Mechanical Properties of PA6by SLS

作　　者：王联凤[1,2,3] 刘延辉[4] 朱小刚 李崇桂[4] 孙靖 程灵钰 郭立杰 于治水[4] 

机构地区：[1]上海航天设备制造总厂,上海200245 [2]同济大学材料科学与工程学院,上海200092 [3]上海复杂金属构件增材制造工程技术研究中心,上海200245 [4]上海工程技术大学材料工程学院,上海201620

出　　处：《应用激光》2016年第2期136-140,共5页Applied Laser

基　　金：上海市经济和信息化委员会专项资金资助项目(项目编号:沪CXY-2014-005)

摘　　要：通过粉末床铺设置尼龙微粉,进行选择性激光烧结(SLS),制备了尼龙6(PA6)拉伸试样。分析了所制备样品在三维方向上的拉伸性能,研究了拉伸断口的微观形态。结果表明,所制备的样品致密无孔隙。激光扫描方向和面堆积方向的拉伸强度分别为42.7 MPa和42.5 MPa,高于体堆积方向的拉伸强度39.3 MPa;激光扫描方向和面堆积方向的断裂伸长率约为体堆积方向的两倍。断口分析显示,拉伸断口由裂纹萌生区和裂纹扩展区组成,裂纹起源于未熔融PA颗粒与熔融粘结PA的界面。Polyamides 6（PA6）samples were produced for tensile test by selective laser sintering（SLS）with a powderbased process.The tensile properties of the samples were investigated in the three directions relative to SLS process and the microstructure of the tensile fracture was researched.Results show that the samples are compact and imporous.The tensile strength is 42.7 MPa and 42.5 MPa in the direction of laser scanning and overlapping.But the tensile strength is39.3 MPa in the vertical direction.In addition,the elongation at break of the samples in the direction of laser scanning and overlapping is about twice as much as that in the vertical direction.The fraction microstructure indicated that the fraction is composed of crack initiation zone and fast propagation zone.The crack originated from the interface of un-melting PA6 particles and the melting PA6.

关 键 词：尼龙 选择性激光烧结 3D打印 力学性能. 

分 类 号：TG456.7[金属学及工艺—焊接]