Granite Bainite Microstructure and Hardness of 30Cr3Ni2 Alloy Steel Prepared by Laser Direct Deposition
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Xueting Chen, Suiyuan Chen, Tingting Guan, Tong Cui, Jing Liang, Changsheng Liu
30Cr3Ni2 alloy steel was prepared by laser direct deposition technology. The microstructures and hardness of the alloy steel were studied by metallurgical microscope, scanning electron microscope, energy dispersive spectrometer, X-ray diffraction, microhardness tester and transmission electron microscope. The results show that the microstructure of 30Cr3Ni2 alloy steel was composed of the grain boundary allotriomorphic ferrite/granular bainite (FGBA/BG), which the average hardness was 379HV. The phases of 30Cr3Ni2 alloy steel were mainly composed of α-Fe solid solution, M7C3 and γ-Fe. This study paves the way for the further deepening of the research on alloy steel parts prepared by laser direct deposition.
laser direct deposition, 30Cr3Ni2 alloy steel, microstructure, hardness, granular bainite.