Sachs Zur Ableitung einer Fliessbedingung, Z. Becker Pencil glide formulation for polycrystal modelling, Scr. Jonas Theoretical analyses of 〈 111 〉 pencil glide in b.c.c. Elam The distortion of iron crystals, Proc. Chavanne Investigation of slip system activity in iron at room temperature by SEM and AFM in-situ tensile and compression tests of iron single crystals, Int. Franciosi Expectable specific features of BCC crystal plastic flow and consistency with the Schmid law, Phil. Gilormini The theory of rate sensitive pencil glide application to rolling textures, Acta Metall. The pencil glide approach can be viewed as a reduced order model enhancing computational efficiency of crystal plasticity simulations involving many slip mechanisms. Limitations of the approach, especially in the case of simple shear textures, are also pointed out. The evolution of crystallographic textures obtained either based on pencil glide or using the 24 slip systems is analyzed and compared to classical experimental results from the literature. The comparison is extended to α-iron polycrystals behaviour under tension, compression, rolling and simple shear loading conditions. In the case of α-iron single crystals both approaches are shown to accurately reproduce recent experimental results . The response of the pencil glide model in terms of stress-strain curves and lattice rotation is compared to the prediction based on the consideration of all ( 〈 111 〉 ) slip systems. For that purpose, the pencil glide extension of Schmid’s criterion used by Gilormini is incorporated in a single crystal model and in a homogenized polycrystal model accounting for large elastoviscoplastic deformations. Thibaux, M.Y.The present work demonstrates that the pencil glide mechanism is a physically reliable and a computationally efficient model to simulate the nonlinear behaviour of b.c.c. The current state of these efforts will be described and future developments discussed. Here in contrast, a physics-based crystal plasticity model incorporated into a computationally efficient hierarchical multi-scale forming simulation will be employed aiming to more accurately predict texture and strength changes. However, current phenomenological hardening models are not able to correctly reproduce the anisotropic strength evolution during forming. During pipe forming the coil material experiences a complex deformation history with several strain path changes leading to pipe properties differing from those of the coil. The second part then presents ongoing experimental und numerical activities aiming to predict the mechanical properties of ferritic steel pipes manufactured from hot rolled coils. In addition, secondary phases can largely increase hardening rates beyond those of single-phase microstructures. The residual Burgers vector emerges as a central quantity to rationalize the experimental hardening/softening trends originating from twin-related dislocation reactions. By incorporating them into a crystal plasticity framework their contribution to latent and self-hardening is quantified and correlated with dislocation reactions. Using selected single crystal orientations slip-slip, slip-twin, twin-slip and twin-twin interactions are triggered. The first part of this talk examines strain hardening mechanisms in face centered cubic based FeCoNiCr(Mn,Al) single and dual-phase high entropy alloys.
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