Mechanical properties of V-added medium Mn TRIP steel

摘要

Ultra-fine Grained TRansformation-Induced Plasticity (UFG TRIP) 0.16％C-6.0％Mn-2.0％Al-0.08％V steel was obtained by cold rolling and intercritical annealing.The microstructure contained a large volume fraction of retained austenite after intercritical annealing at 700℃,720℃,740℃ and 760℃ for 180s.The ferrite and austenite grains had a submicron grain size.VC carbide precipitates were identified by TEM-EDS.This type of UFG steel has an excellent combination of tensile strength and total elongation.