选区激光熔化316L不锈钢多孔材料的成型与力学性能

Forming and Mechanical Properties of 316L Stainless Steel Porous Materials by Selective Laser Melting

金属多孔结构因可以有效地解决植入体“应力屏蔽”效应带来的负面影响而备受关注。通过选区激光熔化技术(Selective laser melting,SLM),成型了不同孔隙率的316L不锈钢多孔结构,探究了其成型过程后的表面形貌及力学性能。结果表明,SLM制备的多孔结构表面无明显的裂纹、塌陷、翘曲变形等缺陷。成型的多孔结构孔隙率为60%~80%,弹性模量为3.156~4.906 GPa,满足了与人骨的匹配要求,并随着孔隙率的增加而降低。抗压强度随着孔隙率的增大而减小,为204~352 MPa,远高于人骨的强度。

The metal porous structure can effectively solve the negative effects caused by the"stress shielding"effect of implants,which has attracted much attention.The porous structure of 316L stainless steel with different porosity was formed by Selective laser melting(SLM)technology.The surface morphology and mechanical properties of the stainless steel were investigated after the forming process.The results show that the surface of porous structure prepared by SLM has no obvious defects such as crack,collapse and warping deformation.The porosity of the formed porous structure is 60%-80%,and the elastic modulus is 3.156-4.906 GPa,which meets the requirements of matching human bone,and decreases with the increase of porosity.The compressive strength is 204~352MPa,and decreases with the increase of porosity,which is much higher than that of human bone.