H<sub>2</sub>/H<sub>2</sub>O气氛下Fe-C合金气固反应脱碳机理

doi:10.11896/cldb.19070027

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Abstract Recent years, a totally new solid state steelmaking process has been proposed. The pig iron is directly casted and then decarburized in an oxi-dizing atmosphere in order to eliminate inclusions. To investigate the mechanism of carbon diffusion in gas-solid decarburization, the microstructures and carbon concentration gradient of Fe-C alloy strip along the thickness was studied. The results showed that the Fe-C alloy strip along the thickness direction following decarburization consisted of three layers: the L₁ layer (ferrite phase) that was near the surface, the L₂ la-yer (austenite+cementite+graphite) that was between the L₁ and L₃ layers, the L₃ layer (cementite+graphite) was in the center of the sample. The depth of the decarburization layer (L₁+L₂) showed a good linear relation with the square root of the decarburization time, the equation is y=kt^0.5. The carbon concentration gradient curves of the Fe-C alloy strip along the thickness direction consisted of three stages. It is found that the three stages correspond to three layers and the integral results of the carbon concentration gradient curves are approximately equal to the average carbon content of the Fe-C alloy strips. Based on these results. The solid state steel making process is confirmed to be feasible for the thin sheets. The activation of decarburization is obtained (E_a=137.4kJ·mol^-1) by decarburized layer depth.

Key words： decarburization gas-solid reaction carbon concentration gradient microstructure diffusion

Published: 06 November 2020

CLC number:

TF746

Fund:Natural Science Foundation of Hebei Province (E2019209160,E2018209284).

About author:: Caijiao Sunreceived master of engineering degree in metallurgical engineering from North China University of Science and Technology in March 2015 and participates in College of Metallurgy and Energy of North China University of Science and Technology. Focusing on the research of new steelmaking technology and comprehensive utilization of resources.
Lukuo Hongreceived Ph.D. degree in June 2018 from Beijing Central Iron and Steel Research Institute and participates in College of Metallurgy and Energy of North China University of Science and Technology. Focusing on the research of new steelmaking technology and comprehensive utilization of resources.

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	SUN Caijiao
	AI Liqun
	HONG Lukuo
	CHENG Rong
	ZHOU Meijie
	HOU Yaobin

Cite this article:

SUN Caijiao,AI Liqun,HONG Lukuo, et al. Mechanism of Carbon Diffusion in Solid State Steelmaking from the Fe-C Alloy Strip Through Gas-Solid Decarburization in H₂/H₂O[J]. Materials Reports, 2020, 34(20): 20112-20117.

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http://www.mater-rep.com/EN/10.11896/cldb.19070027 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20112

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