Effect of high temperature homogenization on carbide morphology and mechanical properties of 1.3C-5Cr-0.7Mo-0.6V steel

doi:10.13251/j.issn.0254-6051.2020.12.013

Abstract

Abstract: To improve the primary carbides of 1.3C-5Cr-0.7Mo-0.6V steel, high temperature homogenization (HTH) was carried out at 1170 ℃ for different time, followed by water quenching to room temperature. Subsequently, a conventional heat treatment process, annealing, quenching and tempering, was further employed to obtain the final microstructure of the steel. The microstructure and mechanical properties of the specimens were analyzed by means of scanning electron microscopy, transmission electron microscopy, X-ray diffraction and compression tests. The results indicate that the size and morphology of the primary carbide are considerably improved by HTH. The network carbides are refined into small and spheroidal ones that distribute homogenously on the matrix. An outstanding compression mechanical property, compression strength of 4703 MPa and engineering strain of 37.3%, is obtained for the specimen due to 3 h HTH treatment. Compared with the untreated steel, the compression strength is enhanced by 14.5%, accompanied by an increase of 30.8% of the compression strain.

Key words: chromium steel, heat treatment, carbides, mechanical properties

CLC Number:

TG162.9

Dong Ziyao, Wang Rui, Kang Yan, Li Dazhao, Yan Zhijie. Effect of high temperature homogenization on carbide morphology and mechanical properties of 1.3C-5Cr-0.7Mo-0.6V steel[J]. Heat Treatment of Metals, 2020, 45(12): 69-75.

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