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The results presented in the article concern the effect of structure and cold deformation on the behaviour of a highalloy duplex stainless steel (a + c), grade X2CrNiMoN22-5-3, in tensile tests at 850°C at a rate vr = 15·10 mm/s. Tests were carried out for a sheet after supersaturation from 1250 and 1350°C and subsequent cold rolling with the values of fh deformation within the range of 0.5–0.9. It was shown that the material undergoes superplastic flow, which is associated with the a → c + v transformation occurring at the tensile testing temperature. It was shown that the superplasticity effect depends on the initial structure and is greater for the material supersaturated from 1350°C as compared to 1250°C. This effect also increases with the increase of the cold deformation value of the sheet. It was proven that increasing cold deformation causes, after tensile testing at 850°C, an increase in the area fraction of the v phase inhibiting the austenite grain growth in the steel structure.

prace instytutu metalurgii żelaza im. stanisława staszica

EFFECT OF INITIAL STRUCTURE AND COLD DEFORMATION ON THE STRESS – ELONGATION CURVE OF DUPLEX STAINLESS STEEL (α + γ) IN A STATIC TENSILE TESTING AT 850°C