Effect of Processing Parameters on Relative Density of 1Cr18Ni9Ti Parts by Selective Laser Melting
Author of the article:DENG Zhiyun;YAO Fei;KE Linda;XIAO Meili;LAI Caifang
Author's Workplace：Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China
Key Words：selective laser melting 1Cr18Ni9Ti relative density mechanical properties
Abstract：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%.
