【摘要】 为了进一步研究激光选区熔化嫁接成型工艺与性能，采用激光选区熔化（SLM）嫁接成型技术制备不同工艺参数316L/18Ni300嫁接成型件，用光学显微镜和扫描电子显微镜（SEM）表征嫁接界面金相组织和微观形貌，用电子万能试验机测试316L/18Ni300嫁接试样力学性能。研究发现，当能量密度为60 J/mm~3，即激光功率为300 W，扫描速度为1 000 mm/s，扫描间距为0.1 mm时，所得试样致密度为99.1%，剪切强度为1 502 MPa，且嫁接体致密度随激光能量密度先增大后减小。嫁接体、嫁接界面嫁接体侧、基体侧与基体显微维氏硬度分别为359.2 HV、239.4 HV、198.6 HV和169.8 HV，嫁接界面两侧相较嫁接体与基体显微维氏硬度有显著差距。嫁接过程中，18Ni300与316L形成融合区，但嫁接界面未能良好形成联生结晶，且存在孔隙。更多还原

【Abstract】 In order to further study the process and performance of laser selective melting grafting molding,laser selective melting (SLM)grafting molding technology was used to prepare 316L/18Ni300 grafted molded parts with different process parameters,optical microscopy and scanning electron microscopy (SEM) were used to characterize the metallographic structure and microscopic morphology of the grafting interface,and the mechanical properties of 316L/18Ni300 grafting specimens were tested by electronic universal testing machine.It was found that when the energy density is 60 J/mm~3,that is,the laser power was 300 W,the scanning speed was 1 000 mm/s,and the scanning spacing was 0.1 mm,the density of the grafted sample was 99.1%,and the shear strength was 1 502 MPa,and the density of the grafted body first increased and then decreased with the laser energy density.The micro Vickers hardness of grafting body,grafting interface,grafting body side,matrix side and matrix were 359.2 HV,239.4 HV,198.6 HV and 169.8 HV respectively.There was a significant difference in Vickers hardness between the two sides of the grafting interface compared with the grafting body and the matrix,it was due to the formation of fusion zone between 18Ni300 and 316L during the grafting process,but the grafting interface failed to form intergrowth crystals and pores.更多还原