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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。
Nylon 6 (PA6) tensile specimens were prepared by setting nylon powder through a powder bed and performing selective laser sintering (SLS). The tensile properties of the prepared samples in three dimensions were analyzed, and the microscopic morphology of the tensile fracture was studied. The results show that the prepared samples are compact and nonporous. The tensile strength in laser scanning direction and surface stacking direction were 42.7 MPa and 42.5 MPa, respectively, higher than the bulk tensile strength of 39.3 MPa. The elongation at break in laser scanning direction and surface stacking direction was about two Times Fracture analysis shows that the tensile fracture consists of crack initiation zone and crack propagation zone, and the crack originates from the interface between the unmelted PA particles and the melt-bonded PA.