Abstract
Ternary isothermal diffusion was studied in molten Fe-C-Si and Fe-C-Mn alloy which are of practical importance in steelmaking process. Two kinds of experimentation were carried out at 1550°C by the diffusion couple method; the first one is based on Fujita's solution4)6), the second on Boltzmann-Matano's solution for ternary system7). The results are summarized as follows:
1) By the method I in Fe-C-Si system (0.304.88%C, 00.77%Si)
Dcc=2.4±0.27, Dcsi=-0.03±0.19, Dsic=0.3±0.13, Dsisi=1.5±0.23.
(×10-4cm2/s)
2) By the method II in Fe-C-Si system (0.480.63%C, 0.080.55%Si)
Dcc=1.141.86, Dcsi=0.010.50, Dsic=-0.210.11, Dsisi=0.330.97.
(×10-4cm2/s)
3) By the method II in Fe-C-Mn system (2.963.22%C, 2.473.69%Mn) Dcc=1.032.58, DCMn=-1.970.55, DMnC=-0.810.15, DMnMn=0.511.93.
(×10-4cm2/s)
Discussion shows that, due to the experimental limitation, the values measured by the method I are larger than those obtained by the method II. The results also satisfy the general properties of diffusion path.
