Effect of Rare Earth Ce on Microstructure Evolution of Fe-Ni-Al Maraging Steel During Isothermal Process
TAN Huijie1, WANG Haiyan1,*, HUA Liangeng2, GAO Xueyun1, LYU Meng1, YU Dawei2, XING Lei1
1 School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 Inner Mongolia First Machinery Group Co.,Ltd., Baotou 014010, Inner Mongolia, China
Abstract: The microstructure evolution and mechanical properties of maraging steel were systematically studied by OM, XRD, SEM and TEM, and compared with those of maraging steel with rare earth Ce. The results show that the hardness of two experimental steels increased firstly with the aging time, and then entered a wide hardness plateau. Compared with ordinary maraging steel, the mareging steel with rare earth Ce has finer lath martensite and more uniform martensite laths distribution, but its hardness decreases slightly. After aging at 500 ℃ for 3 h, the elongation of the experimental steel with rare earth Ce increases, and the strength change little, the tensile strength reaches 2 053 MPa. There are two types of precipitation with the aging to the experimental steel. One is NbC precipitated particles with larger size , the other is dispersed B2-NiAl phase with smaller size. After the addition of rare earth Ce, the size of NbC precipitation decreases, and the precipitation of NiAl phase is delayed. The lattice constants of the B2 phase and the matrix were obtained by HRTEM. The B2-NiAl is coherent with the matrix, and the mismatch between the two phases is 0.2%.
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2025, Vol. 39 
