Increasing Cr content from 9 to 12 mass % leads to superior corrosion and high-temperature oxidation resistances, but usually changes microstructure from martensite to full-ferrite. Alloy design was conducted for 12CrODS steels to modify their structure to the martensite-base matrix, since the transformable martensititic ODS steels have superior processing capability by using α/γ phase transformation. The two types of ferrite are included; the equilibrium ferrite is predictable from the equilibrium phase diagram. Formation of the metastable residual ferrite was assessed through pinning of α/γ interfacial boundaries by oxide particles as well as chemical driving force for the α to γ transformation.

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