Numerical Modelling of Mechanical Anisotropy during Low Temperature Nitriding of Stainless Steel

Ömer C. Kücükyildiz, Mads Rostgaard Sonne, Jesper Thorborg, Grethe Winther, Jesper H. Hattel, Marcel A. J. Somers

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Abstract

A 3D Finite Element method (FEM) model for investigation of the anisotropic mechanical behaviour of austenitic stainless steel during nitriding is presented. The model considers the non-linear concentration dependent diffusion of nitrogen including trapping by chromium, the surface reaction, elastic and plastic anisotropy and influences on thermodynamics (solubility) and diffusion kinetics. Large differences in the nitrided case thickness have previously been attributed to the elastic and plastic anisotropy, which in turn affects the diffusion and solubility properties of nitrogen. The two mechanically distinctive grain orientations <001> and <111> are simulated and the stress, strain and concentration profiles are discussed and compared to experimental findings.
Original languageEnglish
Publication date2018
Number of pages7
Publication statusPublished - 2018
Event2018 European Conference on Heat Treatment (ECHT 2018) - Friedrichshafen, Germany
Duration: 12 Apr 201813 Apr 2018

Conference

Conference2018 European Conference on Heat Treatment (ECHT 2018)
CountryGermany
CityFriedrichshafen
Period12/04/201813/04/2018

Keywords

  • Nitriding
  • Diffusion
  • Stresses
  • Plasticity
  • Anisotropy

Cite this

Kücükyildiz, Ö. C., Sonne, M. R., Thorborg, J., Winther, G., Hattel, J. H., & Somers, M. A. J. (2018). Numerical Modelling of Mechanical Anisotropy during Low Temperature Nitriding of Stainless Steel. Paper presented at 2018 European Conference on Heat Treatment (ECHT 2018), Friedrichshafen, Germany.