Abstract
Duplex stainless steels with ultrafine- or fine-grained microstructures showed pronounced discontinuous yielding and Lüders banding behavior during tensile deformation at 77 K. In particular, sample with high-stability "eye"-shaped structures and ultrafine grains exhibited a yield strength of 1750 MPa, a yield drop of 87 MPa and a Lüders strain of 0.23.
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