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Journal of Achievements in Materials and Manufacturing Engineering

Tytuł artykułu

Computational investigation of the tensile behaviour of the hard coated Ti-6Al-4V alloy

Autorzy Ziaja, W. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN Purpose: Modification of the surface layer of the titanium alloys is frequently applied in order to improve their tribological properties. Various surface engineering techniques can be used to produce hard coatings, e. g. composed of metallic carbides, nitrides or more recently DLC. The coating and substrate materials possess significantly different stiffness and strength properties. This can lead to premature failure of the usually elastic coating in case of plastic deformation of the substrate when the high stresses are encountered. Cracking of the hard coating leads to stress concentration and localized plastic deformation of the substrate that can modify macroscopic deformation behaviour of the system. In the paper the influence of coating and substrate properties on local plastic deformation of substrate material was numerically investigated. Design/methodology/approach: Two dimensional finite element analysis of the process of tensile deformation of titanium alloy with hard elastic coating was carried out. Two cases were analyzed, i. e. with and without diffusion strengthened layer underlying the coating. Findings: The influence of the difference in Young's modulus between coating and substrate material, yield strength of substrate material, coating thickness and depth of the crack in the coating on local plastic deformation of substrate material was determined. Research limitations/implications: Some extension of the numerical model should be pursued in order to take into account initiation of microcracks in surface layer of the coated material and process of coating delamination. Practical implications: The results could be used in the element design process for selection of parameters of surface layer with complex structure for load bearing applications. Originality/value: The mechanical behaviour of hard coated material was most frequently studied for indentation and friction conditions and much less investigations were carried out for coated systems under tension or compression.
Słowa kluczowe
PL komputerowa nauka o materiałach   stop tytanowy   warstwa powierzchniowa  
EN computational material science   titanium alloys   surface layers  
Wydawca International OCSCO World Press
Czasopismo Journal of Achievements in Materials and Manufacturing Engineering
Rocznik 2008
Tom Vol. 26, nr 2
Strony 175--178
Opis fizyczny Bibliogr. 15 poz., wykr.
autor Ziaja, W.
  • Department of Materials Science, Rzeszów University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,
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