Effect of different heat treatment processes on microstructure and properties of large-thickness bridge steels

doi:10.13251/j.issn.0254-6051.2023.10.003

Abstract

Abstract: Effect of different heat treatment processes on microstructural characteristics of large-thickness weathering bridge steels with a C-Mn-Nb-V composition system were investigated. The microstructure evolution of the steel under three different processes (TMCP, TMCP+tempering, and TMCP+quenching and tempering) was investigated by means of optical microscope, scanning electron microscope (SEM), and electron backscattered diffraction(EBSD). The results show that the microstructure is composed of granular bainite, polygonal ferrite, and M/A islands after the TMCP process. After the TMCP+tempering process, the degree of recovery and recrystallization is high, M/A islands disappear, and the microstructure is fine and uniform, which is granular bainite and polygonal ferrite. After the TMCP+quenching and tempering process, a complex phase of granular bainite, polygonal ferrite, and a small amount of M/A islands is obtained, and the grains grow slightly after recrystallization. Therefore, the microstructure and comprehensive properties of the steel plate is the best after TMCP+tempering process.

Key words: bridge steel, TMCP, tempering, quenching and tempering, microstructure

CLC Number:

TG156

Yang Ying, Xu Hongliang, Wang Yubo, Wu Huibin, Mao Xinping. Effect of different heat treatment processes on microstructure and properties of large-thickness bridge steels[J]. Heat Treatment of Metals, 2023, 48(10): 23-28.

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