抄録
On the Heterogeneous Equilibria relating to liquid phase in the iron-corner.
By thermal analysis and microscopic examination, the melting points and the structural constituents of iron rich Fe-Cr-Si alloys containing up to 33% Si and up to about 50% Cr were determined. These alloys used were made of electrolytic iron, low carbon ferro-chromium and refined silicon by means of 3KVA. high frequency induction furnace.
In this composition range, there lie five primary crystallization surfaces, on which α, δ, η, ε and ∑ phases crystallize out. The phase ∑ is the ternary compound based on the super lattice of FeCr. The δ and η phases are all proportionally miscible solid solutions of FeSi-CrSi and Fe5Si3-Cr5Si3. respectively. The η phase in the Fe-Si system is formed during cooling in solid by the peritectoid reaction α+δ→η, while in the ternary system, Fe-Cr-Si, this phase crystallizes out primarily on cooling from liquid.
The following three invariant reactions take place;
Melt+δ_??_η+α, 1182°, Melt+ε_??_η+α, 12100°; Melt+∑_??_ε+α, 1230° and these invariant points are at 7.5% Cr 21.0% Si, 25.5% Cr 17.0%Si and 30.5% Cr 15.5% Si, respectively.
