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Finite Element Analysis of Extrusion Force and Work Characteristics of ECAP

Authors:Alex Llerena, Viktor Gonda

Abstract

A planar finite element model is created for modeling the equal channel angular pressing (ECAP) processing of copper, by which the technological parameters can be determined for different initial parameters of the ECAP process. The structure of the model is described, as well as the extraction of the force and work data, furthermore results for the effect of the initial parameters, e.g. the friction and the frictional model on the extrusion force and work characteristics are shown.

Key words: equal channel angular pressing, extrusion, friction model, finite element simulation

DOI: 10.24867/ATM-2018-2-007

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TiAlN tribological coatings prepared in industrial deposition system with different rotations

Authors:Aleksandar Miletić, Peter Panjan, Miha Čekada, Pal Terek, Lazar Kovačević, Branko Škorić

Abstract

Efficiency and lifetime of manufacturing tools and mechanical components may be successfully improved by application of thin ceramic coatings. When it comes to tools for machining of hard materials such as machining of hardened steel, TiAlN is one of the most usually applied coatings. This material is of high hardness, high oxidation resistance and high temperature stability. In this research, surface morphology, mechanical and tribological properties of TiAlN coatings prepared in industrial deposition unit were studied. Three different coatings were prepared by selecting different rotational types in a magnetron sputtering deposition chamber. Surface morphology was characterized by stylus profilometry and atomic force microscopy, mechanical properties by nanoindentation technique and Rockwell indentation test, while pin-on-plate test was used to study tribological behavior. It was found that coatings prepared by higher number of rotations are smoother, harder, and more resistant to cracking and wear. These differences are attributed to differences in coating microstructure which refines with increased number of rotations.

Key words: Thin ceramic coating; TiAlN; magnetron sputtering; mechanical properties, friction, wear

DOI: 10.24867/ATM-2018-2-008

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