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=kt0.5. 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 (Ea=137.4kJ·mol-1) by decarburized layer depth.
孙彩娇, 艾立群, 洪陆阔, 程荣, 周美洁, 侯耀斌. H2/H2O气氛下Fe-C合金气固反应脱碳机理[J]. 材料导报, 2020, 34(20): 20112-20117.
SUN Caijiao, AI Liqun, HONG Lukuo, CHENG Rong, ZHOU Meijie, HOU Yaobin. Mechanism of Carbon Diffusion in Solid State Steelmaking from the Fe-C Alloy Strip Through Gas-Solid Decarburization in H2/H2O. Materials Reports, 2020, 34(20): 20112-20117.
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2020, Vol. 34 
