Abstract: In order to optimize the microstructure and properties of 4Cr5MoSiV1 steel formed by selective laser melting technology, the effects of support structure and laser remelting on the morphology, microstructure, microhardness and tensile properties of 4Cr5MoSiV1 steel were studied. The results show that mechanical properties of the samples can be improved by fine grain strengthening, solution strengthening, precipitation strengthening and metallurgical quality increasing, and the metallurgical quality has a higher influence on the mechanical properties. The tensile strength, elongation after fracture, microhardness of top surface and bottom surface of 4Cr5MoSiV1 steel are 948.6 MPa, 9.3%, 578.2HV and 560.4HV respectively. The reduction of X/Y spacing of the support structure can increase the number of support structures, improve the support function, enhance the thermal conductivity, and increase the fine grain strengthening, solution strengthening and metallurgical quality of the samples, so the mechanical properties of the samples are improved. Cutting distance has little effect on the mechanical properties of the samples, but the difficulty of support removal is reduced. The effect of laser boundary remelting on the mechanical properties of the sample is small. After laser surface remelting, the grain coarsening and the second phase precipitation in the grain increase, the splashing particles, black smoke particles and pore defects basically disappear, and the mechanical properties of samples are significantly improved. The tensile strength, elongation after fracture, microhardness of top surface and bottom surface are 1 387.2 MPa, 14.6%, 632.4HV and 608.4HV respectively.
陈帅, 陶凤和, 贾长治, 孙河洋. 选区激光熔化成型4Cr5MoSiV1钢的组织与性能优化[J]. 材料导报, 2021, 35(16): 16126-16132.
CHEN Shuai, TAO Fenghe, JIA Changzhi, SUN Heyang. Optimization of Microstructure and Properties of 4Cr5MoSiV1 Steel Formed by Selective Laser Melting. Materials Reports, 2021, 35(16): 16126-16132.
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2021, Vol. 35 
