摘要
在激光功率为72 W、粉层厚度为0.03 mm、激光扫描速度为400 mm/s的条件下,采用激光选区熔化(SLM)工艺快速成型厚度0.1 mm的316L不锈钢薄片.研究了激光扫描间距对薄片的成型、表面硬度、表面粗糙度的影响.结果表明,随着激光扫描间距的减小,薄片每层熔道的左右、上下搭接随之增加,当激光扫描间距为0.03 mm时熔道搭接最优;激光扫描间距大于0.03 mm时,熔道搭接不足,薄片难以成型;激光扫描间距小于0.03 mm时,熔道搭接过度,薄片表面出现飞溅和过熔现象.此外,还随着激光扫描间距减小,薄片表面硬度增加;薄片表面粗糙度Ra先减小后增大,在激光扫描间距为0.03 mm时表面粗糙度Ra最优为7.439μm.
In this work,316L stainless steel samples with thickness of 0.1 mm were fabricated by using a selective laser melting process with laser power of 72 W,layer thickness of 0.03 mm,and laser scanning speed of 400 mm/s.Special attention was paid to the effect of laser scanning distance on the surface hardness and roughness.The results show that with the decrease of laser scanning distance,the overlap of each layer increases,and the most optimal laser scanning distance was 0.03 mm.When the laser scanning distance is more than 0.03mm,the weld bead overlap is insufficient and the sheet is difficult to form.When laser scanning distance is less than 0.03 mm,the overlap of the melt path is excessive,and the surface of the sheet appears spatter and over-melted;otherwise,the sheet is difficult to be formed.The surface hardness of the flakes increases with the decrease of laser scanning distance,and the surface roughness(Ra)of the sheet decreases first and then increases.The surface roughness Ra presented a peak value of 7.439μm at the laser scanning pitch of 0.03 mm.
作者
李俊
杨立军
郑航
LI Jun;YANG Li-jun;ZHENG Hang(College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
CAS
2020年第3期153-157,171,共6页
Journal of Shaanxi University of Science & Technology
基金
陕西省科技厅自然科学基础研究计划项目(2018JM5012)。
关键词
选区激光熔化
316L不锈钢
激光扫描间距
表面粗糙度
表面硬度
selective laser melting
316L stainless steel
laser scanning distance
surface roughness
surface hardness
