Measurement and analysis of SH-CCT curves of Q690CFD HSLA hydropower steel

doi:10.13251/j.issn.0254-6051.2024.02.009

Abstract

Abstract: SH-CCT curves of Q690CFD high strength steel for hydropower were established by using Gleeble-3800 thermal simulation test machine, and the effect of cooling rate on the microstructure and hardness of the coarse grain heat affected zone of the tested steel was studied. The results show that three transformation forms as martensite, martensite and bainite and bainite occur in the heat affected zone (HAZ) of the tested steel at the measured cooling rate. When the cooling rate is 40 ℃/s, the hardness of the HAZ reaches the maximum of 344 HV10, and the microstructure is composed of lath martensite and bainite ferrite. With the decrease of cooling rate, granular bainite begins to appear, and the hardness of the matrix decreases gradually. At the same time, the shape of M-A component in bainite changes from granular and short rod to lamella. When the cooling rate is lower than 5 ℃/s, the microstructure of the HAZ is all granular bainite, and the hardness of the matrix is lower than that of the base metal.

Key words: HSLA steel, thermal simulation, phase transition temperature, SH-CCT curves

CLC Number:

TG442

Cao Jiali, Jin Hongze, Li Kangli, Xu Yapeng, Zhao Qiang, Wang Cuiping, Li Mengnan. Measurement and analysis of SH-CCT curves of Q690CFD HSLA hydropower steel[J]. Heat Treatment of Metals, 2024, 49(2): 60-65.

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