Effect of Powder Characteristics on the Properties of Parts Fabricted by Selective Laser Melting
In this paper,the effect of the particle size and morphology of metal powder on the properties of SLM forming parts is studied in order to guide the production of metal powder.The particle size,morphology and chemical composition of 316L stainless steel powder prepared by different gas atomization process parameters were measured and characterized.The density,hardness,tensile properties and microstructure of the parts formed by selective laser melting technology with 316L powders which have different particle size and morphology were tested and analyzed.The results show that the stainless steel powders are spherical or nearly spherical and the particle size distribution is normal distribution.The relative density of the powder with average particle size of 45.35 μm can reach the highest value of 98.52%under the conditions of laser power 270 W,scanning speed 950 mm/s,powder layer thickness 50 μm and scanning space 0.14mm.The microstructures of these forming parts are mainly composed of equiaxial crystal and columnar crystal.The tensile behavior of the part formed by the powder with an average particle size of 29.89 μm is brittle fracture and the fracture surface is cleavage surface.There are fine and uniform dimples on the tensile fracture of other powder forming parts,which are characterized by ductile fracture.The maximum tensile strength,ductility and hardness of the parts are 752.22 MPa,34.3%and 278.76Hv,respectively.The parts formed by powder with an average particle size of 29.89 μm and 33.33 μm have better comprehensive mechanical properties.The results also show that the spherical powder is propitious to the formation.The particle size distribution of the powder is concentrated in 25-40 μm,and the comprehensive mechanical properties of the powder are better.The larger particle size distribution of powder is beneficial to obtain high density parts.The above results have guiding significance for powder preparation and parts production.
Selective Laser Melting powder size distribution 316L stainless steel microstructure
Wang Fuchao Wei Qingsong Jiao Lixin Ji Xiantai Yang Yu Yang Pei
Huazhong University of Science & Technology,Luoyu Road 1037,Wuhan,China Metal Materials Co.,Ltd.of WISCO CHINA,Wuhan,China
国际会议
北京
英文
1745-1755
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）