Achieving Excellent Strength–Ductility and Impact Toughness Combination by Cyclic Quenching in Medium Mn TRIP-Aided Steel

Microstructure and mechanical properties of Mo-Nb microalloyed medium Manganese trip Steel by cyclic quenching

“…In the subsequent ART process, the recovered residual austenite tends to nucleate along the thinner lath martensite boundary. Finally, relatively small banded RA can be obtained at room temperature [15]. For the CQ3-ART sample, the microstructure is significantly smaller than the CQ1-ART sample and comparable to the CQ2-ART sample, indicating that the change in grain size after thrice cyclic quenching has been stabilized.…”

“…It is known that retained austenite (RA) with excessive stability cannot exhibit an extensive TRIP effect, which hinders the transformation of RA into martensite under continuous strain conditions, resulting in poor mechanical properties. However, RA with low stability will be deformed immediately when it is subjected to small strain, resulting in unsustainable work hardening rate of medium Mn steel [10][11][12]. In summary, obtaining RA with higher content and better stability is the key factor for the development of medium-Mn TRIP steel.…”

Structural evolution in a synthetically produced ultrafine grained low carbon steel

“…Majority of researchers have aimed at evolving newer means to reproducibly manufacture second phase strengthened nanograined steels and as well as, gaining insight into the underlying physical sciences. Continued effort to tailor strategy for toughening and strengthening of ultra fine grained steels encompasses employment of different processing routes like thermomechanical processing [5,6], severe plastic deformation by equal channel angular pressing [7,8], cyclic quenching [9], dynamic strain induced transformation [10][11][12], roll bonding [13,14], bidirectional large scale deformation and dynamic recrystallization through multi axle forging [15][16][17] for the production of ultra fine grained steels. These processes enable to achieve excellent combination of strength and ductility; accordingly, structurally refined steels of various types are seen to have assumed considerable commercial importance [18].…”