2014•Rejiagong gongyiRequires access

Continuous Cooling Transformation Static CCT Curve and Microstructure of 60 mm Q690D

LI Degan

Abstract

The continuous cooling transformation static CCT curve of 60 mm Q690D steel was measured by Formast-F full automatic transformation instrument of expansion method and metallography-hardness method. The effects of cooling rate on the microstructure and hardness of the steel were analyzed. The results show that the austenite transformation products are ferrite, pearlite and bainite when the cooling rate is lower than 1℃/s. Those will be ferrite and bainite when the cooling rate is1~3℃/s. Those will be bainite and martensite when the cooling rate is 5~40℃/s and those will be completely martensite if the cooling rate is higher than 40℃/s. When the cooling rate is lower than 20℃/s,the microhardness increases. The cooling rate is 20~100℃/s,the microhardness is almost 390 HV.

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Key concepts: Bainite, Continuous cooling transformation, Materials science, Indentation hardness, Pearlite, Microstructure, Austenite, Martensite