激光能量密度对金属增材制造微观结构及力学性能的影响研究

Effects of Laser Energy Density on Microstructure and Mechanical Properties of Metal Additive Manufacturing

激光能量密度的大小直接决定金属增材制造过程中粉末的熔化状态,并最终影响制件的微观结构及力学性能。为了揭示金属增材制造过程中不同激光能量密度的成形行为,以316L不锈钢激光选区熔融成型制件为研究对象,对不同工艺参数制件的微观组织形貌观察及力学性能进行分析,探讨了激光功率对材料性能的影响。结果表明,激光功率对粉末熔化状态的影响相对较大,从而进一步影响到成型件性能,在激光选区熔融成型制造过程中,当激光能量密度为87 J/mm^(3)时,得到样件的硬度最优。

The laser energy density directly determines the melting state of the powder in the process of metal addictive material manufacture,and finally the microstructure and mechanical properties of the parts is affected.In order to reveal the shaping behavior of different laser energy density in the process of metal fabrication,taking 316L stainless steel laser selective melting molding as research object,the microstructure and mechanical properties of the parts made with different process parameters were analyzed.The influences of laser power parameters on the properties of the material was discussed.The results show that laser power has a relatively large effect on the melting state of powder,which furtherly affects the performance of the molded parts.In the SLM shaping manufacturing process,the hardness of the sample is the best when the laser energy density is 87 J/mm^(3).