Abstract
The microsegregation of C and Cr in type 430 stainless steel as cast state was investigated with EPMA. Chromium content [Cr] in α-phase was 18.5% and that in γ-phase 17.8%, but carbon content [C] in γ-phase was 10 times more than that in α-phase. The phase boundary where Cr-carbide precipitated was enriched with C and Cr.
These results suggest that Cr does not segregate so much as expected from the equilibrium phase diagram during phase transformation of as cast 17% Cr stainless steel and the thermodynamic unstability of each phase can be offset by C segreagation in them. The analysis of C in stainless steel with EPMA was also discussed.
