Abstract
Tensile tests of Fe-Cr and Fe-Ni alloys have been carried out in the ferrite, ferrite+austenite, and austenite regions over a range of strain rates 10−4 to 10−1 min−1. Fe-Cr alloy have shown the typical superplastic behaviour in the two-phase region at the strain rates lower than 3×10−4 min−1. The role of the two-phase structure in the superplastic behaviour of these alloys has been discussed. The results obtained are as follows:(1) The minimum in flow stress of Fe-Cr and Fe-Ni alloys was observed in the ferrite+austenite two-phase region.(2) For both alloys, the maximum in strain rate sensitivity, m, is observed in the two-phase region.(3) A good correlation was found between m-value and elongation in Fe-Cr alloys. The maximum elongation is obtained in the two-phase region where the m-value is largest.
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