High Speed Deformation of Ultrafine Grained TWIP Steel
Tensile properties of twinning induced plasticity (TWIP) steels (31%Mn-3%Al-3%Si-Fe) with various mean grain sizes ranging from ultrafine grain size (1.1μm) to conventional one (35.5μm) at a wide range of strain rates from 10-3sec-1 to 103sec-1 were studied. The ultrafine grained TWIP steel exhibits a large work hardening and keeps an adequate elongation at any strain rate. The strength held to the Hall-Petch relationship at each strain rate and the Hall-Petch slopes do not change largely.
Young Won Chang, Nack J. Kim and Chong Soo Lee
R. Ueji et al., "High Speed Deformation of Ultrafine Grained TWIP Steel", Materials Science Forum, Vols. 561-565, pp. 107-110, 2007