Effect of Rare Earth La on Carbide Precipitation Behavior and Tensile Property of Fe-Ni-Al Maraging Steel

ZHOU Tong; WANG Haiyan; HUA Liangeng; CAO Yue; XING Lei; YAO Ke; YU Dawei

doi:10.11973/jxgccl240045

Materials and Mechanical Engineering > 2025 > 49(1): 51-58. > DOI: 10.11973/jxgccl240045

ZHOU Tong, WANG Haiyan, HUA Liangeng, CAO Yue, XING Lei, YAO Ke, YU Dawei. Effect of Rare Earth La on Carbide Precipitation Behavior and Tensile Property of Fe-Ni-Al Maraging Steel[J]. Materials and Mechanical Engineering, 2025, 49(1): 51-58. DOI: 10.11973/jxgccl240045

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Effect of Rare Earth La on Carbide Precipitation Behavior and Tensile Property of Fe-Ni-Al Maraging Steel

1.
Inner Mongolia Key Laboratory of Advanced Metal Materials, School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
2.
Inner Mongolia First Machinery Group Co., Ltd., Baotou 014010, China

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Received Date: January 26, 2024
Revised Date: November 20, 2024

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Abstract

Abstract

Fe-Ni-Al maraging steels without La and with 0.02% (mass fraction) La were smelted and treated by solid solution at 900 ℃ for 0.5 h and isothermal aging at 500 ℃ for different times (0, 0.25, 0.50, 1.00, 2.00, 3.00, 4.00 h). The effects of La on the evolution of martensitic structure, precipitated phase and tensile properties of the test steel were studied. The results show that the martensitic structure in the test steel had a recovery phenomenon with the extension of aging time, the precipitation of (Nb, Mo) C was coarsened and aggregated. The addition of La could promote the recovery of martensitic structure and the precipitation of carbide, refine the size of carbide and inhibit its aggregation at the grain boundary. By extending aging time, the tensile strength of the test steel without La increased and the percentage elongation after fracture decreased, while the tensile strength and percentage elongation after fracture of the steel with La all increased. The strengthening effect of a large amount of precipitation of (Nb, Mo)C and the promotion effect of La addition on the recovery of martensite structure were the reason for the simultaneous improvement of strength and plasticity of the test steel containg La.
- rare earth La,
- maraging steel,
- isothermal aging,
- (Nb, Mo) C precipitation

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Effect of Rare Earth La on Carbide Precipitation Behavior and Tensile Property of Fe-Ni-Al Maraging Steel

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