抄録
Results obtained are shown in Figs. 4 & 5. There are many fields of phase and phases as α, α+ε, ε, α+ε+γ, ε+γ, γ+σ and α+γ+σ in the iron cornner of the system. The fields of α, α+ε and ε phases were mostly determined by measuring the thermal expansion, γ+σ by the experiment of microstructure and α+ε+γ, σ+γ and γ by both methods. The fields of γ+σ phases at higher Cr content and α+γ+σ phases were conbined to assume. It is known that hardness and specific gravity same to distinguish the field of σε phase from ther fields.
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