Effects of Nitriding Subsequent Titanaliting of Steels

  • Andrei Mihai GHINEA Politehnica University of Bucharest, Romania
  • Mihai Ovidiu COJOCARU Politehnica University of Bucharest, Romania; Academy of Technical Science of Romania
  • Leontin Nicolae DRUGÀ UTTIS Industries Bucharest, Romania; Academy of Technical Science of Romania
Keywords: titanaliting, nitriding, thermodynamics of the conversion of aluminides to nitrides, formation of kinetic layer, optical microscopy, electronic microscopy


The paper presents the results of nitriding in partially dissociated ammonia of the pure technical iron, respectively 34CrAlMo5 steel after titanaliting in powdery solid medium, with direct reference on the growth kinetics of the layers, the phase composition and the morphology of the resulting layers. Thermodynamics was anticipated and experimentally demonstrated that the layers of titanium aluminide formed on the surfaces of the two metallic materials considered do not constitute barriers to nitrogen diffusion during the nitriding process, but actively participate in the formation of simple or complex nitrides of the two elements, titanium and aluminum. On the other hand, in the presence of these layers, the flux of nitrogen atoms is slightly diminished with repercussions on the dimensions of the structural components of the layer. The conclusion of the experimental research was that the role of titanaliting prior to nitriding is to increase the proportion of the hardening phases in the surface layers of thermochemically processed metal products after nitriding.

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How to Cite
GHINEA AM, COJOCARU MO, DRUGÀ LN. Effects of Nitriding Subsequent Titanaliting of Steels. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science [Internet]. 15Jun.2020 [cited 26Oct.2020];43(2):34-. Available from: https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/3469