热轧带钢FeO共析转变动力学行为分析与预测

doi:10.13228/j.boyuan.issn0449-749x.20230291

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Abstract The oxide scales will be formed on the surface of the hot-rolled strip,in which FeO will undergo eutectoid phase transformation during the cooling process after coiling,forming a eutectoid organization consisting of Fe and Fe₃O₄. Traditionally,studies on the eutectoid phase transformation have focused on the qualitative analysis of the eutectoid phase transformation,such as chemical composition,phase transformation environment and other factors,but there are few modeling analyses and calculations for the phase transformation process. Besides,since the phase transformation process of FeO in actual production mostly occurs during continuous cooling,it is affected by the superposition of temperature changes at different moments,which increases the degree of difficulty in the study. For this reason,the isothermal structural transformation experiments of FeO at different temperatures and times were first conducted using a simultaneous thermal analyzer for common plain carbon steel. The volume percent of eutectoid structures in FeO at 30 experimental nodes was counted. Afterwards,an isothermal phase transition kinetic model of FeO was established based on Johnson-Mehl-Avrami-Kolmogorov(JMAK) equation,and the key parameters were solved by the experimental data to obtain the volume percent of eutectoid structure versus time under isothermal transition conditions,and the Time-Temperature-Transformation(TTT) curves can be directly plotted to describe the eutectoid transition of FeO.On the basis of this isothermal phase transition,a model for the FeO eutectoid phase transformation during continuous cooling was established by combining Scheil′s additivity law,and the volume percent of FeO eutectoid organization during continuous cooling transformation was predicted by calculating the model constant. With the experimental validation,the predicted volume percent of FeO eutectoid phase transformation remains basically consistent with the experimental values,which proves the usability of the model. This method can be used to describe the phase transformation process of FeO more concretely and provide a new solution for the study of the phase transformation behavior of FeO.

Key words： oxide scale eutectoid transformation FeO phase change kinetics phase change prediction

Received: 26 May 2023

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	WANG Hao
	CAO Guangming
	SHAN Wenchao
	CUI Chunyuan
	LIU Zhenyu

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WANG Hao,CAO Guangming,SHAN Wenchao等. Kinetic analysis and prediction of FeO eutectoid transformation in hot-rolled strip steel[J]. Iron and Steel, 2023, 58(9): 178-184.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230291 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I9/178

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