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Degradation of gaseous nitriding of steel by lubricant contamination — Effect of in-situ pre-treatments

Article dans une revue avec comité de lecture
Auteur
GUILLOT, B.
BARRALLIER, Laurent
211915 Mechanics surfaces and materials processing [MSMP]
ccJÉGOU, Sébastien

URI
http://hdl.handle.net/10985/11576
DOI
10.1016/j.surfcoat.2017.01.107
Date
2017
Journal
Surface and Coatings Technology

Résumé

The present work focuses on the industrial inhibition of gaseous nitrided parts and on the industrial in-situ pre-treatment that can be used to avoid these inhibitions. The first objective is to obtain a repeatable defective nitriding process on carbon iron-based alloys, while the second is to determine the ability of determined in-situ pre-treatments to counter the previously mastered inhibition. Machining oil is used in order to obtain an industrially consistent inhibition. Its presence before chemical treatment strongly inhibits the adsorption of nitrogen atoms at the other surface, leading to heterogeneous nitriding properties of the treated samples. EDS analysis of oil residues indicates the presence of several elements, such as sulphur and carbon. As several studies already focused on the influence of sulphur on nitriding properties, experimentations on the influence of carbon are detailed. Contamination by carbon deposit leads to similar inhibition as in the case of a machining oil contamination. Literature analyses lead to the determination of three in-situ pre-treatments, namely urea (CH4N2O), pre-oxidation and ammonium chloride (NH4Cl), to counter the detrimental effects such contaminations. Although all the processes enable to suppress the nitriding inhibition due to the presence of machining oil, ammonium chloride indicates the best capability to activate the adsorption of nitrogen of machining oil contaminated surfaces.

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  • Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

Documents liés

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  • Influence of strain hardening on gaseous nitriding of steels 
    Communication avec acte
    GUILLOT, Benjamin; BARRALLIER, Laurent; ccJÉGOU, Sébastien (ASM International, 2016)
    Machining is known to introduce plastic straining and residual stress gradients in surface of mechanical parts. If not controlled, the mechanical state of a surface can influence adsorption and diffusion of atoms during ...
  • Activation of surfaces prior to gaseous nitriding of a 3wt.% Cr carbon iron-based alloy 
    Communication avec acte
    ccJÉGOU, Sébastien; GUILLOT, Benjamin; BARRALLIER, Laurent (2016)
    Gaseous nitriding is a well-established thermochemical treatment of carbon iron-based alloys that considerably enhances corrosion, wear and fatigue resistances of critical mechanical parts such as crank shafts and bearings. ...
  • Evolution of residual stresses during short time nitriding of 33CrMoV12-9 steel grade 
    Article dans une revue avec comité de lecture
    FALLOT, Guillaume; BARRALLIER, Laurent; ccJÉGOU, Sébastien (Trans Tech Publications, 2014)
    The evolution of residual stresses during short time gas nitriding of 33CrMoV12-9 steel grade is studied. It aims understanding the influence of nitriding parameters (temperature T and nitriding potential Kn) on the ...
  • Qualification of the damage induced by friction using X-ray Diffractometry 
    Communication sans acte
    FABRE, Agnès; BARRALLIER, Laurent; ccJÉGOU, Sébastien (2014)
    In a previous study, the capability of X-ray diffraction technique to qualify damage occurring during friction had been proven [1]. The purpose of this study is to complete this research in order to develop a method to ...
  • Crystallography of Stress corrosion cracking of austenitic stainless steel by scanning electron microscope and electron backscatter diffraction 
    Communication avec acte
    MUBARAK, Hazem; VOLOVITCH, Polina; OGLE, Kévin; BARRALLIER, Laurent; ccJÉGOU, Sébastien (2015)
    In this study, Stress Corrosion Cracking (SCC) produced for 304L austenitic stainless steel in different concentrations of chloride containing sulfuric acid solutions was analyzed using both Scanning Electron Microscope ...

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