Effect of Aging Treatment on Microstructure and Mechanical Properties of 10Ni10Mn2CuAl Steel

doi:10.12068/j.issn.1005-3026.2022.05.006

Abstract

Abstract: A new type of high-strength marine steel with the composition of 10Ni10Mn2CuAl was designed by means of precipitation strengthening from hybrid Cu-rich and NiAl (Mn) phases， and the effect of aging treatment on microstructure and mechanical properties of the 10Ni10Mn2CuAl steel was studied. The precipitating temperature and the phase content of the precipitations were calculated by Thermo-Calc software. The typical inclusions in the matrix and microstructure after aging treatment were analyzed by optical，scanning electron microscopes，the hardness and room-temperature tensile tests were carried out. The results show that the precipitating temperature of Cu-rich phase is in the range of 300~606℃ and the maximum content of the precipitation is 1.41%. With the aging time increasing， the martensitic lath changes from the coarse grain to the refined one， corresponding to the hardness reaching the maximum and then becoming stable. Meanwhile， as the aging temperature increases， the time to reach the maximum hardness is shortened owing to the precipitation process accelerated by higher temperature. Under the heat treatment of the aging at 500℃ for 24 h， the best performance of the experimental steel is achieved with yield strength of 1435.51MPa， tensile strength of 1555.42MPa and elongation of 8%.

Key words: heat treatment; composite precipitation; martensitic steel; high plasticity; microstructure

CLC Number:

TP20

DONG Yan-wu， PENG Fei， TIAN Jia-long， JIANG Zhou-hua. Effect of Aging Treatment on Microstructure and Mechanical Properties of 10Ni10Mn2CuAl Steel[J]. Journal of Northeastern University(Natural Science), 2022, 43(5): 646-651.

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