Study on the diffusion behavior of carbon during solid-state decarbonization process
In order to study the decarburization effect of Fe-C-Mn alloy strips during solid-state decar-burization and the diffusion effect of Mn content on C atoms,the solid-state decarburization test was carried out with Fe-2.7%C-(5%,12%)Mn alloy composition and 1 mm thickness strips.The molecular dynamics simulation test was carried out by using Lammps software to explore the qualitative law of Mn content on C atom diffusion.The results show that the diffusion activation energy calculated by mo-lecular dynamics simulation is basically the same as that calculated by solid state decarburization exper-iment.The diffusion activation energy of C atom in 5%Mn at 1223 K,1323 K and 1363 K is 78.549 kJ·mol-1 and 83.805 kJ·mol-1,respectively.The solid-state decarburization test was carried out at 1363 K.The main limiting step of 5%Mn and 12%Mn alloy strips for 5～20 min was internal carbon diffusion.The decarburization effect of 12%Mn was not as good as that of 5%Mn,indicating that the in-crease of Mn content inhibited C diffusion.Molecular dynamics simulation results shows that the in-crease of Mn content reduces the diffusion ability of C atoms.
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