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Structure-property modeling of low-alloyed TRIP steels

TUE : Materials Technology (Mate) group
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  • Computer Science
  • Engineering
  • Physics


12 /department of mechanical engineering PO Box 513, 5600 MB Eindhoven, the Netherlands Structure-property modeling of low-alloyed TRIP steels S.P. Chen, V. Kouznetsova, M.G.D. Geers Netherlands Institute for Metals Research Eindhoven University of Technology Faculty of Mechanical Engineering Introduction TRansformation Induced Plasticity (TRIP) is a phenomenon which occurs during solid phase transformation triggered by an applied mechanical load, and which causes irreversible strains at stress levels that are below the current yield stress of the softer phase. Low alloyed multi-component TRIP steels present a unique combination of high ductility and strength, which comes from both TRIP and the synergy between the properties of multicomponents. The aim is to develop a physically-based, multi-scale model to predict the structure- property relations in the TRIP steels (Fig.1). MACRO Engineering level MESO RVE level MICRO Lamellae model martensite Austenite matrix (ferrite+bainite) retained austenite Martensite Boundary value problem F P x F PE E N Figure 1. A general scheme of the multi-scale model for multi- component low alloyed TRIP steel. Methods 2 Develop a model for martensitic transformation in TRIP steel in a thermodynamically based continuum me- chanics framework at large strains. 2 Incorporate the model in a hierarchical micro-macro computational homogenization strategy [1]. Miromechanical model The transforming microstructure is considered as a rank-one laminate composed of a martensite plate and an austenite layer. The total deformation gradient tensor F at a trans- forming region is assumed to be known. The evolution of martensitic volume fraction and the constitutive behavior of the transforming region can be obtained by solving the fol- lowing equation system: Ftr = I+ ~M ⊗ ~N (1) FA · (I− ~N ⊗ ~N) = FM · (I− ~N ⊗ ~N) (2) (PA −PM) · ~N = 0 (3) F = (1− ξ)FA + ξFM P = (1− ξ)PA + ξPM (4) τ i = f(Ci, lnBei,4γi) (5) G = ρ0[Φ]− 〈P〉T : [F

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