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2003•Heat treatment of metalsRequires access

Effect of Heat Treatment Technology on Microstructure of Low Carbon Si-Mn TRIP Steel

Hong Zou

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Abstract

Si Mn TRIP steel has a multi phase microstructure,which is mainly composed of ferrite,bainite and retained austenite.The relationship between heat treatment process and microstructure of the steel was investigated by means of tint etching method,together with X ray diffraction,SEM and TEM method in this paper.The results show that in the intercritical phase regions,with the annealing temperature rising,the volume percentage of the ferrite matrix reduces,the bainite increases and the stability of retained austenite fluctuates.In the bainite transformation range,if isothermal temperature is either over high or over low,the volume percentage of the retained austenite will be reduced and the bainite is provided with granular morphology.

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What this paper is about

Si Mn TRIP steel has a multi phase microstructure,which is mainly composed of ferrite,bainite and retained austenite.The relationship between heat treatment process and microstructure of the steel was investigated by means of tint etching method,together with X ray diffraction,SEM and TEM method in this paper.The results show that in the intercritical phase regions,with the annealing temperature rising,the volume percentage of the ferrite matrix reduces,the bainite increases and the stability of retained austenite fluctuates.In the bainite transformation range,if isothermal temperature is either over high or over low,the volume percentage of the retained austenite will be reduced and the bainite is provided with granular morphology.

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Available abstract

Si Mn TRIP steel has a multi phase microstructure,which is mainly composed of ferrite,bainite and retained austenite.The relationship between heat treatment process and microstructure of the steel was investigated by means of tint etching method,together with X ray diffraction,SEM and TEM method in this paper.The results show that in the intercritical phase regions,with the annealing temperature rising,the volume percentage of the ferrite matrix reduces,the bainite increases and the stability of retained austenite fluctuates.In the bainite transformation range,if isothermal temperature is either over high or over low,the volume percentage of the retained austenite will be reduced and the bainite is provided with granular morphology.

Key concepts: Bainite, Materials science, Austenite, Microstructure, Metallurgy, Ferrite (magnet), Austempering, Isothermal process

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