碳元素含量对SLM成形316L不锈钢机械性能的影响  

Influence of Carbon Content on Mechanical Properties of 316 L Stainless Steel Via SLM

作　　者：陈鑫 钱波[1] 李腾飞[1] Chen Xin;Qian Bo;Li Tengfei(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai,200237 China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《机械科学与技术》2020年第5期804-809,共6页Mechanical Science and Technology for Aerospace Engineering

摘　　要：通过添加石墨碳粉改变SLM成形过程中316L不锈钢的碳元素含量,研究3D打印过程中不同碳含量对316L不锈钢微观结构和力学性能的影响。结果表明:随着碳含量的增加,不同碳含量的316L不锈钢的硬度也随之增加,而拉伸强度性能却随之先增大后减小。通过对断口形貌的观察发现,在低、中碳含量下的断裂状态为韧性断裂,而在高碳含量下的断裂为脆性断裂。这是由于碳元素所形成的碳化物在低含量阶段增强了不锈钢的拉伸性能,但随着碳含量增多,微裂纹所形成的缺陷逐渐起到主导地位,严重影响拉伸性能。Graphite to add in 316L stainless steel change the carbon content in the selective laser melting(SLM).The influence of the carbon content on the microstructure and mechanical properties of 316L stainless steel was investigated.The results showed that the hardness of 316L stainless steel increased the increasing of carbon content,and the tensile strength decreased after increase due to the carbides enhance the tensile properties of stainless steel.Through the observation of the fracture morphology,it is found that the fractures at low and medium carbon content are ductile,while the fracture at high carbon content is brittle.With the increase of microcracks,the defects gradually play a leading role,which seriously affects the tensile properties.

关 键 词：SLM 316L不锈钢 碳含量 力学性能 

分 类 号：TD406[矿业工程—矿山机电]