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Phase Transformation and Microstructure of Q345E Steel During Continuous Cooling

Bao Siqian

Abstract

The phase transformation and microstructure of Q345E steel during continuous cooling were studied by THERMECMASTOR-Z thermal mechanical simulator.The continuous cooling transformation diagram(dynamic CCT diagram) of the steel was drawn by thermal dilatometer test.The results show that the polygonal ferrite is obtained at low cooling rate.The amount of acicular ferrite and bainite increases when the cooling rate is higher than 10 ℃/s.The microstructure of Q345E steel mainly consists of bainite and a small amount of ferrite when the cooling rate is higher than 20 ℃/s.The microstructure is refined under higher cooling rate.

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Available abstract

Key concepts: Continuous cooling transformation, Dilatometer, Microstructure, Bainite, Materials science, Acicular ferrite, Ferrite (magnet), Metallurgy