Effect of rare element Ce on microstructure and mechanical properties of 32MnMoNiCu cast steel

doi:10.13251/j.issn.0254-6051.2025.01.007

Abstract

Abstract: By adding rare earth cerium iron alloy in the 32MnMoNiCu cast steel, the effect of rare earth Ce on microstructure and mechanical properties of the cast steel was investigated by using scanning electron microscopy observation, tensile and impact testing methods. The results show that rare earth Ce can refine the ferrite phase, transform inclusions shape from long strip into nodular, and decrease the size of inclusions. Rare earth Ce mainly exists in the form of CeAlO₃, and does not react with MnS inclusions. Precipitation strengthening and fine-grained strengthening which are caused by rare earth Ce in the cast steel result in 12.3% and 23.4% increase in tensile strength and yield strength, respectively. However, the increase fraction of lath ferrite by adding rare earth Ce result in 11.1% and 7.4% decrease in elongation and impact absorbed energy, respectively.

Key words: 32MnMoNiCu cast steel, rare element Ce, microstructure, mechanical properties

CLC Number:

TG143.8

Li Jianguo, Jia Dongsheng, Zhao Yinhu, Liu Yubao, Wang Xu, Zhao Leicheng, Lan Yueguang. Effect of rare element Ce on microstructure and mechanical properties of 32MnMoNiCu cast steel[J]. Heat Treatment of Metals, 2025, 50(1): 47-52.

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