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Numerical Simulation Of Residual Stresses In Hardmetals Using An Elastic-Viscoplastic Material Description

  • : Wolfgang Kayser1, Alexander Bezold1, Geng Chen1, Christoph Broeckmann1, Stanley van Kempen1, Mirko Boin2
  • : 1Institute for Materials Applications in Mechanical Engineering RWTH University, 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
  • : PDF Download
  • : 2016

Abstract

Based on five mesoscopic 2,5D representative volume elements (RVE) representing a WC6wt.-%Co hard metal grade, the temperature dependent internal and final residual stress state is predicted by FEM using an elasto-viscoplastic modelling approach. The utilized models are semi automatically derived from backscatter electron micrographs and extruded in the third dimension get a more realistic deformation pattern compared to plane strain or plane stress assumptions.  For the isotropic viscoplastic material description of the binder alloy (Co), Voce hardening law in combination with the Norton-Bailey law is used for modelling the creep and relaxation behaviour. The mechanical behaviour of the carbides (WC) is assumed to be in the isotropic elastic region. The internal stresses are predicted in a temperature range between 900 °C and room temperature (RT). The temperature dependent internal stresses are compared to neutron diffraction results for the same hard metal grade.

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