Experimental Study on Decarburization of Iron-carbon Alloy Sheet under CO-CO₂ Atmosphere

In order to study the effect of temperature,holding time and thickness of steel sheet on decarburization of Fe-C alloy sheet in CO-CO₂ atmosphere,the experiments were carried out in a weak oxidation atmosphere of Ar-CO-CO₂ on 2 mm,1.5 mm and 1 mm thick Fe-C alloy sheet with initial carbon content of 4.2%. As decarburization temperature increases,both decarbonization amount and decarburization rate increase. When decarburization time extends,the decarburization amount increases. Decarburization rate is faster in the early stage of decarburization.The decarbonization rate of thin sheet with 1 mm thickness can reach 92% at 1 413 K for 60 min.The thickness of strip had a significant effect on decarburization.Given the same holding time,The decarburization effect of 1 mm strip is better than those of 1.5 mm strip and 2 mm sheet. As the decarburization time prolongs,the thickness of ferrite region increases,and the mass fraction of carbon near the reaction interface decreases.