Effects of processing parameters on microstructure and mechanical properties of Co-25Cr-5Mo-5W alloys by selective laser melting
HUANG Zonglian1,3, WANG Bo1, LIU Fei1, MA Qing2, LIU Shaojun1,3
1. Shenzhen Research Institute, Central South University, Shenzhen 518057, China; 2. Shenzhen Institute of Tsinghua University, Shenzhen 518057, China; 3. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
Abstract:The Co-25Cr-5Mo-5W alloys were fabricated by selective laser melting (SLM) technique using gas atomization Co-25Cr-5Mo-5W powders as raw materials. The effects of the laser power, scanning speed, scanning space and laser energy density on the phase composition, microstructure and mechanical properties of SLM-ed Co-25Cr- 5Mo-5W alloys were investigated systematically by combining XRD, SEM, TEM and tensile testing. The results show that the laser power is positively associated with the sintering density of SLM Co-25Cr-5Mo-5W alloys. In contrast, it is negatively associated with the scanning speed (excluding 300 mm/s) and scanning space. The γ(fcc) and ε(hcp) phases are observed in the SLM Co-25Cr-5Mo-5W alloys. They present SN (Shoji-Nishiyama) orientation relationship The fine and uniform columnar crystals, cellular crystal and nanosized carbide precipitates result in the improvement of the mechanical properties of SLM-ed alloy. Co-25Cr-5Mo-5W alloys by SLM with high strength and good ductility are achieved when the laser power, the scanning speed, the scanning space and the laser energy density are 160 W, 400 mm/s, 0.07 mm, and 190.4 J/mm3, respectively. The relative density, tensile strength, yield strength and elongation are 98.6%, 1 284 MPa, 934 MPa, and 16% respectively.
黄宗炼, 王博, 刘飞, 马清, 刘绍军. 选区激光熔化工艺参数对Co-25Cr-5Mo-5W合金结构与性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(6): 582-590.
HUANG Zonglian, WANG Bo, LIU Fei, MA Qing, LIU Shaojun. Effects of processing parameters on microstructure and mechanical properties of Co-25Cr-5Mo-5W alloys by selective laser melting. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 582-590.
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