溶融Fe-C-SiおよびFe-C-Mn合金における相互拡散

抄録

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)
D_cc=2.4±0.27, D_csi=-0.03±0.19, D_sic=0.3±0.13, D_sisi=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)
D_cc=1.141.86, D_csi=0.010.50, D_sic=-0.210.11, D_sisi=0.330.97.
(×10^-4cm²/s)
3) By the method II in Fe-C-Mn system (2.963.22%C, 2.473.69%Mn) D_cc=1.032.58, D_CMn=-1.970.55, D_MnC=-0.810.15, D_MnMn=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.