The role of monotonic pre-deformation on the fatigue performance of a high-manganese austenitic TWIP steel

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 499; no. 1; pp. 518 - 524
• Main Authors: Niendorf, T., Lotze, C., Canadinc, D., Frehn, A., Maier, H.J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.01.2009; Elsevier
• Subjects: Applied sciences; Bauschinger effect; Elasticity. Plasticity; Exact sciences and technology; Fatigue; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Twinning; Twinning-induced plasticity; TWIP steel; Twinning-induced plasticity; Fatigue; Bauschinger effect; Twinning; TWIP steel; Microstructure; Rolling; Dislocation glide; Manganese steels; Density; Twinning induced plasticity; Prestrained material; Austenitic steel; Plasticity
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2008.09.033

The fatigue performance of a high-manganese austenitic steel featuring the twinning-induced plasticity (TWIP) effect was investigated in both thermomechanically treated rolled and pre-deformed conditions. A thorough set of mechanical experiments and microstructural analyses demonstrated that microstructural evolutions during high-strain monotonic and low-strain cyclic deformations differ significantly. Specifically, a high twin density is obtained as a result of monotonic deformation, and a low twin density, yet a noticeable increase in twin thickness, is observed in the fatigued samples. Furthermore, the fatigue performance of the pre-deformed TWIP steel samples is superior to that of the as-received steel, which is attributed to the enhanced interaction of glide dislocations with twins of increased density owing to the monotonic pre-deformation.