Transactions of Materials and Heat Treatment

Title：Influence of compression deformation temperature on dynamics and microstructure evolution of bainitic steel for vehicle

Authors： Zhang Junfeng Deng Lin

Unit： Chongqing College of Electronic Engineering

KeyWords： compression deformation temperature bainite phase transition dynamics microstructure analytical model

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2019,44(3):164-168

Abstract：

The phase transition law of bainitic steel at different compression deformation temperatures was studied by the thermal simulation test machine, and its phase transition dynamics and tissue evolution were analyzed. The results show that the curves of the samples after deformation treatment at medium and low temperatures display rising trend of parabola. After dealing with the deformation at 300 and 500 ℃, the bainite transformation rate increases to form more ferrite, and the ratio of ferrite in bainite at 700 and 850 ℃ is lower than that in the sample without deformation treatment. The nucleation of bainite after deformation treatment includes shear band (SB), austenite grain boundary (AGB) and grain edge of bainite (GE). After restoration, the number of defects in shear bands is reduced, and the bainite contents are reduced. However, the number of shear bands can be improved by low temperature deformation. The lath bainite is formed by isothermal treatment of the sample.Thus, short and coarser bainite lath is formed in the specimen deformed at low temperature, and the thickness of ferrite lath decreases with the increase of deformed temperature.

Funds：

重庆市2017科学技术研究课题（KJ1729412）；重庆市教委科学技术研究项目（KJ1503005）

张俊峰（1980-），男，硕士，副教授，E-mail：5476210@qq.com

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