焦斑直径与粉末粒径对激光选区熔化316L不锈钢成形质量影响研究

Influence of Focal Spot Diameter and Powder Particle Size on Forming Quality of 316LStainless Steel by Selective Laser Melting

为进一步获得更高质量的316L不锈钢激光选区熔化(SLM)成形件,研究了不同焦斑直径与不同粉末粒径对SLM成形表面形貌、表面粗糙度、致密度、硬度、拉伸强度、延伸率和显微组织的影响规律。结果表明,粉末粒径对SLM成形质量有显著的影响。采用0~25μm粒径的粉末可获得更优的成形表面粗糙度与延伸率,分别为3.27μm与50.71%;采用15~53μm粒径的粉末可获得更高的硬度与拉伸强度,分别为238.82 HV与748.16 MPa。焦斑直径与粉末粒径相结合共同影响SLM成形质量。相较于50μm大焦斑直径的成形件,采用25μm的小焦斑直径时,不同粉末粒径SLM成形件表面粗糙度、硬度、拉伸强度和延伸率的差异更大。

The effects of different focal spot diameters and powder particle sizes on the surface morphology,surface roughness,density,hardness,tensile strength,elongation,and microstructure of 316Lstainless steel selective laser melting(SLM)forming parts were investigated to obtain higher quality 316Lstainless steel SLM forming parts.The findings reveal that the particle size of the powder has a considerable impact on the SLM forming quality.Using 0-25μm particles yielded superior surface roughness and elongation,which were 3.27μm and 50.71%,respectively.The powders with 15-53μm particle size had 238.82HV and 748.16MPa hardness and tensile strength,respectively.The combination of focal spot diameter and powder particle size has an impact on SLM forming quality.Surface roughness,hardness,tensile strength,and elongation of SLM with different powder particle sizes differed more from those of SLM with a focal spot diameter of 25μm when compared to those of SLM with a focal spot diameter of 50μm.