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

• Autorzy: Ziaja W.
• Języki publikacji: EN

Abstrakty

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

EN

computational material science; titanium alloys; surface layers

PL

komputerowa nauka o materiałach; stop tytanowy; warstwa powierzchniowa

• 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.

Twórcy

autor

Ziaja W.

• Department of Materials Science, Rzeszów University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,

Bibliografia

• [1] C. Leyens, M. Peters (eds), Titanium and Titanium Alloys, Wiley-VCH GmbH & Co. KGaA, 2003.
• [2] R. Filip, Alloying of surface layer of the Ti-6Al-4V titanium alloy through the laser treatment, Journal of Achievements in Materials and Manufacturing Engineering 15 (2006) 174-180.
• [3] A. A. Abduluyahed, K. J. Kurzydłowski, Tensile properties of a type 316 stainless steel strained in air and vacuum, Material Science and Engineering A256 (1998) 34-38.
• [4] L. Qian, S. Zhu, Y. Kagawa, T. Kubo, Tensile damage evolution behavior in plasma-sprayed thermal barrier coating system, Surface and Coatings Technology 173 (2003) 178-184.
• [5] T. Wierzchoń, Structure and properties of multicomponent and composite layers produced by combined surface engineering methods, Surface and Coatings Technology 180-181 (2004) 458-464.
• [6] E. Bemporad, M. Sebastiani, F. Casadei, F. Carassiti, Modelling, production and characterisation of duplex coatings (HVOF and PVD) on Ti-6Al-4V substrate for specific mechanical applications, Surface and Coatings Technology 201 (2007) 7652-7662.
• [7] S. Baragetti, G. M. La Vecchia, A. Terranova, Fatigue behaviour and FEM modelling of thin-coated components, International Journal of Fatigue 25 (2003) 1229-1238.
• [8] P. Bansal, P. H. Shipway, S. B. Leen, Finite element modelling of the fracture behaviour of brittle coatings, Surface and Coatings Technology 200 (2006) 5318-5327.
• [9] A. Kierzkowska, M. Malinowski, E. Krasicka-Cydzik, Characteristics of anodic layer on Ti6Al4V ELI alloy after bending, International Journal of Computational Materials Science and Surface Engineering 1 (2007) 320-334.
• [10] L. A. Dobrzański, A. Śliwa, W. Sitek, W. Kwaśny, The computer simulation of critical compressive stresses on the PVD coatings, International Journal of Computational Materials Science and Surface Engineering 1 (2007) 28-39.
• [11] ADINA-Theory and Modeling Guide, ADINA R&D, Inc., Watertown MA, 2004.
• [12] Y. Zhao, R. Tryon, Automatic 3-D simulation and micro-stress distribution of polycrystalline metallic materials, Computer Methods in Applied Mechanics and Engineering 193 (2004) 3919-3934.
• [13] C. H. Goh, J. M. Wallace, R. W. Neu, D. L. McDowell, Polycrystal plasticity simulations of fretting fatigue, International Journal of Fatigue 23 (2001) S423-435.
• [14] A. Rouzaud, E. Barbier, J. Ernoult, E. Quesnel, A method for elastic modulus measurements of magnetron sputtered thin films dedicated to mechanical applications, Thin Solid Films 270 (1995) 270-274.
• [15] L. A. Dobrzański, K. Lukaszkowicz, A. Zarychta, Mechanical properties of monolayer coatings deposited by PVD techniques, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 423-426.