1Cr18Ni9Ti激光选区熔化成形工艺参数对致密度的影响  

Effect of Processing Parameters on Relative Density of 1Cr18Ni9Ti Parts by Selective Laser Melting

作　　者：邓竹君[1] 姚斐[1] 柯林达[1] 肖美立[1] 赖彩芳 DENG Zhiyun;YAO Fei;KE Linda;XIAO Meili;LAI Caifang(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所

出　　处：《铸造技术》2020年第2期125-128,共4页Foundry Technology

基　　金：上海市工程技术研究中心资助项目(15DZ2251000);上海市科委基础研究项目(17JC1402600)

摘　　要：采用正交试验,结合典型缺陷形成原因和微观组织,研究了激光选区熔化成形工艺参数(激光功率、扫描速度和扫描间距)对1Cr18Ni9Ti不锈钢致密度的影响,分析了各工艺参数对致密度的影响规律。结果表明,粉末熔化的能量输入密度主要取决于激光功率和扫描速度;在激光功率325~340 W、扫描速度1 000~1 200 mm/s、扫描间距0.12 mm的工艺参数下,SLM技术可制备致密度高于99.9%的1Cr18Ni9Ti不锈钢零件。采用优化后的SLM工艺参数成形1Cr18Ni9Ti不锈钢试棒的力学性能优于QJ501A-98标准,抗拉强度Rm≥709 MPa,屈服强度Rp0.2≥547 MPa,断后伸长率A≥41%。The influence of selective laser melting process parameters(laser power, scanning speed and scanning distance)on the relative density of 1Cr18Ni9Ti stainless steel was studied by orthogonal test, combined with the formation cause and microstructure of typical defects. The influence law of each process parameter on relative density was analyzed. The results show that the energy input density of powder melting mainly depends on laser power and scanning speed. Under the process parameters of 325~340 W laser power, 1 000~1 200 mm/s scanning speed and 0.12 mm scanning interval, SLM process can prepare 1Cr18Ni9Ti stainless steel parts with relative density higher than 99.9%. The mechanical properties of 1Cr18Ni9Ti stainless steel samples formed by optimized SLM process parameters are better than QJ501A-98 standard, with ultimate tensile strength greater than 709 MPa, yield strength greater than 547 MPa, and elongation after fracture greater than 41%.

关 键 词：激光选区熔化 1CR18NI9TI 致密度 力学性能 

分 类 号：TH142.2[一般工业技术—材料科学与工程]