Continuous Cooling Transformation Behaviour of 20Cr1Mo1VTiB Steel

LI Xingdong; LI Yan; AI Di; LI Yufeng; LIU Ruiliang

doi:10.11973/jxgccl202102006

Materials and Mechanical Engineering > 2021 > 45(2): 31-36,89. > DOI: 10.11973/jxgccl202102006

LI Xingdong, LI Yan, AI Di, LI Yufeng, LIU Ruiliang. Continuous Cooling Transformation Behaviour of 20Cr1Mo1VTiB Steel[J]. Materials and Mechanical Engineering, 2021, 45(2): 31-36,89. DOI: 10.11973/jxgccl202102006

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Continuous Cooling Transformation Behaviour of 20Cr1Mo1VTiB Steel

1. Shanghai Aeronautical Materials&Structures Testing Co., Ltd., Shanghai 201318, China;
2. Research Institute of Harbin Electric Corporation, Harbin 150028, China;
3. Harbin Turbine Company Limited, Harbin 150046, China;
4. Key Laboratory ofSuperlight Material and Surface Technology of Ministry of Education, College of Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

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Received Date: November 12, 2019
Revised Date: December 20, 2020

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Abstract

Abstract

The bainite transformation point at different quenching temperatures (950-1 100 ℃) and the continuous cooling phase transformation point at the optimal quenching temperature of 20Cr1Mo1VTiB steel were measured on a thermal dilatometer. Then the continuous cooling transformation curves were drawn by combination of the phase transformation points, microstructure observation and hardness test. The relationship between the phase transformation point or transformation amount and the cooling rate was established with empirical equations, and the phase transition activation energy was calculated. The results show that the bainite transformation temperature of the test steel decreased with increasing quenching temperature; the preferred quenching temperature was 1 050 ℃. The supercooled austenite transformation products were proeutectoid ferrite, pearlite and bainite with cooling rates not higher than 0.5 ℃·s^-1, and were single bainite with cooling rates higher than 0.5 ℃·s^-1. The fitting curves of phase transformation point- and phase transformation amount-cooling rate were in good agreement with the test results. The activation energy of proeutectoid ferrite and bainite transition was 744.8, 274.9 kJ·mol^-1, respectively.
- 20Cr1Mo1VTiB steel,
- CCT curve,
- microstructure,
- phase transition activation energy

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References (19)

References

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