Review on Dynamic Recrystallization of Martensitic Stainless Steels during Hot Deformation: Part I-Experimental Study

The evolution of the microstructure changes during hot deformation of high-chromium content of stainless steels (martensitic stainless steels) is reviewed. The microstructural changes taking place under high-temperature conditions and the associated mechanical behaviors are presented. During the continuous dynamic recrystallization (cDRX), the new grains nucleate and growth in materials with high stacking fault energies (SFE). On the other hand, new ultrafine grains could be produced in stainless steel material irrespective of the SFE employing high deformation and temperatures. The gradual transformation results from the dislocation of sub-boundaries created at low strains into ultrafine grains with high angle boundaries at large strains. There is limited information about flow stress and monitoring microstructure changes during the hot forming of martensitic stainless steels. For this reason, continuous dynamic recrystallization (cDRX) is still not entirely understood for these types of metals. Recent studies of the deformation behavior of martensitic stainless steels under thermomechanical conditions investigated the relationship between the microstructural changes and mechanical properties. In this review, grain formation under thermomechanical conditions and dynamic recrystallization behavior of this type of steel during the deformation phase is discussed.

Automated summary

This review discusses the evolution of microstructure and mechanical behavior of high-chromium content stainless steels during hot deformation, highlighting the process of continuous dynamic recrystallization and the formation of new ultrafine grains regardless of stacking fault energies. Limited understanding of flow stress and microstructure changes during hot forming of martensitic stainless steels is noted, emphasizing the need for further research in this area. Recent studies have explored the relationship between microstructural changes and mechanical properties under thermomechanical conditions, shedding light on the dynamic recrystallization behavior of this type of steel during the deformation phase.