Abstract
The isothermal interdiffusivity was studied for molten binary Fe-C and quasi-binary Fe-C-Si alloys at 1 550°C by the diffusion couple method. The experiment was carried out by using a narrow alumina tube as a diffusion chamber under refined argon atmosphere in an electrical resistance furnace. The results can be summarized as follows;
Dc=(1+0.24[%C])×10-4 cm2/s(0.33%C)
Ds/ci = 1.01.4×10-4 cm2/s(0.5%C, 01.34%Si)
Dc/si =6.9×10-5 cm2/s(0.3%C, 0.4%Si)
where Dj/i is the interdiffusion coefficient of i in the quasi-binary Fe-i-j alloy. Discussion was held on the experimental procedure as well as the results investigated. Good agreement is concluded between the present measurement and some reference results which have been measured by the different method and estimated by the other suitable way.
