Tha aim of this work is to study the effect of the microstructure on the superplasticity of 22/100 Cr-5/100 Ni-3/100 Mo-0.18/100 N ferrite(a)-austenite(γ) duplex stainless steel. To obtain different microstruc- Tures several thermo-mechanical treatments were employed. Superplasticity was evaluate at 1253 K by m- Value measurements, elongation to failure, deformation homogeneity, and changes in microstructure after Tensile tests. A maximum elongation of 1510/100 was reached with an initial strain rate of 3 X 10~-4/s. For This condition, the m-value attained 0.64 and necking was not verified.
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