Transactions of Materials and Heat Treatment

Title：Analysis on mechanical and hydrogen embrittleness properties of annealled Fe-24Mn-4Cr-0.5C high manganese steel for vehicle

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ClassificationCode：TG142

year,vol(issue):pagenumber：2020,45(4):184-188

Abstract：

The mechanical characteristics of Fe-24Mn-4Cr-0.5C high manganese steel were measured by using the method of on-line hydrogen charging, the microstructure morphologies of Fe-24Mn-4Cr-0.5C high-manganese steel were observed under the different deformation degrees, and the mechanical characteristics and hydrogen embrittleness sensitivity of the steel samples were analyzed. The results show that the annealed microstructure of high manganese steel is composed of single-phase austenite with equiaxial distribution, and the grain size is lower when the annealing temperature rises. The annealed high manganese steel samples show continuous yield and strong plasticization characteristics, and the strength of the samples decreases when the annealing temperature rises. Compared with the non-hydrogen sample, the uniformity of the tissue for high manganese steel after hydrogen charging is significantly improved, and the strength and plasticity of sample decrease significantly. The samples obtained after 900 ℃ annealing reach the maximum strong plasticization, while the slow strain rate testing test of the samples in the hydrogen state significantly reduce the strong plasticization. When the annealing temperature increases, the high manganese steel will be more susceptible to hydrogen embrittlement.

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重庆市基础科研应用开发计划项目(164391)

夏源（1986-），女，硕士，讲师 E-mail：shikeduanqiao@126.com

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