Abstract
The pseudoelastic behavior of an Fe–28Mn–6Si–5Cr–0.53Nb–0.06C (mass%)alloy with respect to the thermomechanical treatment of pre-warm-rolling andsubsequent ageing is investigated. A partial pseudoelasticity appears betweenAs andMd,where As is the reverse martensitic transformation start temperature andMd is the temperature above which the martensitic transformation cannot be induced bystress. It can be reasonably interpreted as transformation pseudoelasticity, like forthermoelastic shape memory alloys such as Ti–Ni-based alloys and Cu-based alloys. Thethermomechanical treatment is effective in enhancing the pseudoelasticity by increasing theMd temperature. It is also found that the alloy exhibits a partial pseudoelasticity belowAs when the sample is deformed into a two-phase state: fcc and hcp. A conceivablereason for the driving force of the reverse transformation (from hcp to fcc) onunloading is the back-stress experienced by Shockley partial dislocations residing atthe tip of the martensite plates, which originates from NbC precipitates. Perfectpseudoelasticity is also obtained when the specimen is subjected to cyclic loading.
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