Experimental of Gas-solid Decarbonization Process of Fe-C Alloy Ribbon in Medium Carbon Region

In order to study the decarbonization development of iron-carbon alloy in carbon domain,an initial carbon fraction of 1.2% and 1.5 mm thick Fe-C alloy thin strip was used for this purpose.Decarbonization of the strip had been conducted in the form of interface gas-solid reaction.The P_H2O/P_H2 of the atmosphere in the furnace was controlled at 0.61 by adjusting the flow ratio Ar-H₂-H₂O.The experimental temperatures were set to 1 353 K,1 413 K and 1 453 K.And the decarburization time was set to 10～40 minutes.The results show that the decarbonization reaction of the strip is similar to that of the order reaction,and the activation energy is 68.85 kJ/mol.The limiting factor of the reaction is the diffusion of carbon in the thin strip.Tthe empirical formula for the average carbon content in the strip had been fitted and expressed as w_t=1.2e^{((0.148 82-1.28×10-4T)t}.Increasing the decarbonization temperature can not only increase the decarbonization rate but also increase the limit decarbonization amount.With the increase of decarbonization time,the gradient difference of carbon concentration decreases and the diffusion stroke increases.The rate of decarbonization decreases gradually and appears obvious nodes.