Effect of Magnetic Field on Successive γ→ε′→α′ Isothermal Martensitic Transformation in a SUS304L Stainless Steel

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Effect of magnetic field on the TTT diagram of a successive γ→ε′→α′ isothermal martensitic transformation in a solution-treated SUS304L stainless steel has been investigated. The TTT diagram corresponding to 0.5 vol.% transformation of the α′ martensite induced in the ε′ phase shows a C-curve under a magnetic field (0–7T) with a nose temperature located at 103 K. Incubation time of the successive γ→ε′→α′ martensitic transformation shortens as the strength of magnetic field increases although the nose temperature does not depend on the magnetic field. Moreover, the width of the ε′ martensite including α′ martensite becomes thinner as the strength of the applied magnetic field increases at a fixed temperature. This result implies that the potential barrier for the ε′→α′ transformation decreases with increasing magnetic field. We have explained this behaviour based on a model previously proposed by our group.