Continuous cooling transformation of non-quenched and tempered 45MnSiVSQ steel under different deformation conditions

doi:10.13251/j.issn.0254-6051.2020.12.003

Abstract

Abstract: Dynamic and static dilatometric curves of non-quenched and tempered steel 45MnSiVSQ were measured on Gleeble-3500 thermal simulator and thermal dilatometer. The dynamic and static continuous cooling transformation (CCT) curves of the 45MnSiVSQ steel were measured by the tangent method combining with microstructure and hardness analysis, and the effects of deformation temperature and cooling rate on the phase transformation and the interlamellar spacing of the 45MnSiVSQ steel were investigated. The results show that as the cooling rate increases, the pearlite interlamellar spacing gradually decreases when the cooling rate is in the range of 0.1-3 ℃/s. Compared with the static and dynamic CCT curves of the 45 MnSiVSQ steel at 950 ℃, it can be seen that the deformation shortens the phase transformation incubation period especially in the ferrite and pearlite phase transformation range, but it has little effect on the incubation period in the bainite and martensite phase transformation zone, so that the dynamic CCT curves move to the upper left compared to the static CCT curves. By comparing the CCT curves at different deformation temperatures, it is found that bainite phase transformation occurs at 0.5-20 ℃/s when deformed at 950 ℃, while at 0.8-10 ℃/s when deformed at 850 ℃. Low temperature deformation is more conducive to the occurrence of ferrite and pearlite phase transformation, and reduces the probability of occurrence of non-ideal structures such as bainite and martensite.

Key words: non-quenched and tempered steel 45MnSiVSQ, deformation temperature, cooling rates, CCT curves, phase transformation

CLC Number:

TG142.1

Wang Yunlong, Chen Yinli, Yu Wei. Continuous cooling transformation of non-quenched and tempered 45MnSiVSQ steel under different deformation conditions[J]. Heat Treatment of Metals, 2020, 45(12): 13-18.

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