Mesoscopic Finite Element Simulation of Ratchetting Behavior in Medium-Manganese Steel
A two-dimensional representative volume element(RVE)model of Al-containing medium-manganese steel was constructed based on the microscopic morphology.The martensitic transformation evolution equation was introduced,and the constitutive model of austenite and martensite composite phase was constructed by Mori-Tanaka homogenization method.The uniaxial tension and the ratcheting behavior under different working conditions(average stress of 50 MPa and stress amplitude of 700,710 MPa)of the test steel were simulated by mesoscopic finite element simulation.The results show that the established homogeneous constitutive model could well reflect the effect of martensitic transformation on the mechanical properties of the test steel.The simulation of microstructure evolution based on RVE model was accurate.Martensitic transformation could significantly make the test steel strengthened obviously during uniaxial tension,and caused stress alternate between austenite and ferrite.When the average stress was 50 MPa and the stress amplitude was 700 MPa,the simulated ratcheting strain evolution curves with and without consideration of martensitic transformation almost coincided,when the average stress was 50 MPa and the stress amplitude was 710 MPa,the simulated ratcheting strain growth rate without consideration of martensitic transformation was significantly higher than that with consideration.
medium-manganese steelratchetting behaviorfinite element simulationhomogenization modelmartensitic transformation
NETL
NSTL
万方数据
