摘要
在不同激光功率、扫描速度等工艺参数条件下,使用选择性激光熔化设备(SLM100)3D打印成型Al Si10Mg合金拉伸试样,采用Olympus BX5光学显微镜与JEOL JSM-6490LV型扫描电子显微镜观察成型试样的显微组织形貌,研究激光功率、扫描速度对试样拉伸性能的影响。结果显示:成型试样的显微组织呈鱼鳞状或长条状,相互搭接且组织尺寸较小;在激光功率为190 W时,试样抗拉强度随扫描速度降低而增大,当扫描速度为800 mm/s时抗拉强度最高可达371 MPa,固定此扫描速度,抗拉强度随着功率增大而增大;试样的断裂方式为准解理断裂;保持激光能量密度不变,采用高功率、高扫描速度(320 W,1 600 mm/s)成型的试样抗拉强度更大,达到451 MPa。
AlSi10Mg alloy tensile samples were fabricated by selective laser melting equipment(SLM100)under different laser powers and scanning speeds.The microstructure of the molded samples was observed with Olympus BX5 optical microscope and JEOL JSM-6490LV scanning electron microscope.The effects of laser power and scanning speed on the tensile properties of the samples were investigated.The results show that microstructures of the molded samples are fish scale and elongated cells parallel to the stacking direction,which are overlapped and have fine dendritic cells.When the laser power reaches 190 W,the tensile strength of the sample increases with the decrease of the scanning speed.When the scanning speed is set to be 800 mm/s,the tensile strength is up to 371 MPa.The tensile strength increases with the increase of the laser power at the fixed scanning speed.The fracture mechanism of the tested samples is proved to be quasi-cleavage fracture.At the same line-energy,the tensile strength of the tested sample reaches as high as 451 MPa with a processing combination of high power and high scanning speed(320W,1600 mm/s).
作者
王学才
卢云
何仲云
袁广辰
WANG Xuecai;LU Yun;HE Zhongyun;YUAN Guangchen(School of Materials Science&Engineering,Anhui University of Technology,Ma’anshan 243032,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2017年第3期234-240,共7页
Journal of Anhui University of Technology（Natural Science）
基金
国家自然科学基金项目(51271001)
