**5. Conclusions**

The microstructure and deformation mechanisms of the commercial Super Duplex stainless steel F55-UNS S32760 were analyzed and discussed, after thermal heat treatments and tensile tests. The best combination of mechanical properties have been displayed after a solution thermal treatment at 1573 K (1300 ◦C) for 145 s/mm and an annealing thermal treatment performed at 1353 K (1080 ◦C) for 36 s/mm holding time. These high results have been related to the occurrence of a transformation induced plasticity (TRIP) phenomena. This feature is generated by the Magee effect during the deformation. In detail, it results as a strain-induced martensitic shear transformation, triggered by the high density of lattice defects (as slip bands). Since this TRIP phenomenon results need to be strain-induced, it would occur at high strains regimes, where it is usually more desirable. Further, these effects are observed for the first time in commercial SDSSs, involve the martensitic shear precipitation transformation α→γ, and occur in a favorable phase ratio range for the corrosion resistance properties. All these aspects and easy thermal processing could grant the industrial exploitation of this phenomenon in the near future.

**Author Contributions:** A.F.C. conceived and designed the experiments, performed the experiments, analyzed the data and wrote the paper; S.B. conceived and designed the experiments and review the paper; C.D.C. performed the experiments and analyzed the data; A.D.S. contributed reagents/materials/analysis tools and review the paper; A.G. conceived and designed the experiments and review the paper; G.N. performed the experiments and analyzed the data; C.M. contributed reagents/materials/analysis tools and review the paper.

**Funding:** This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

**Conflicts of Interest:** The authors declare no conflict of interest.
