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Internal stresses in PVD coated tool composites

Śliwa A., Mikuła J., Gołombek K., Kwaśny W., Pakuła D.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1371--1378

EN

The aim of work is the investigation of the internal stresses in PVD coated metal matrix composites (MMC). Sintered MMC substrate is composed of the matrix with the chemical composition corresponding to the high-speed steel, reinforced with the TiC type hard carbide phase. Functionally graded composition of MMC providing of high ductility characteristic of steel in the core zone as well as high hardness characteristic of cemented carbides in the surface zone. Internal stresses were determined with use of finite element method in ANSYS environment. The reason of undertaking the work is necessity of develop the research of internal stresses, occurring in the coating, as well as in the adhesion zone of coating and substrate, which makes it possible to draw valuable conclusions concerning engineering process of the advisable structure and chemical composition of coatings. The investigations were carried out on cutting tools models containing defined zones differing in chemical composition. Modelled materials were characteristic of chemical composition corresponding to the high-speed steel at the core, reinforced with the TiC type hard carbide phase with the growing fraction of these phases in the outward direction from the core to the surface, additionally coated with (Ti,Al)N or Ti(C.N) functionally graded PVD coatings. Results of determined internal stresses were compared with the results calculated using experimental X-ray sin2ψ method. It was demonstrated, that the presented model meets the initial criteria, which gives ground to the assumption about its utility for determining the stresses in coatings as well as in functionally graded sintered materials. The results of computer simulations correlate with the experimental results.

2

Azotowanie jarzeniowe i technologie PVD w zastosowaniu do modyfikacji powierzchni narzędzi

Betiuk M., Kowalski S.

Inżynieria Powierzchni

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2010

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Nr 4

18-26

PL

Technologie azotowania jarzeniowego i PVD umożliwiają wytwarzanie warstw i powłok na narzędziach o cechach multifunkcyjnych. Intencją autorów jest zwrócenie uwagi na tradycyjne i nowe technologie plazmowe duplex HIPIMS. W syntetyczny sposób przedstawiono idee technologii azotowania jarzeniowego na potencjale plazmy, oraz potencjale uzupełniającym. Scharakteryzowano istniejące i nowe technologie PVD oraz wytwarzane na powierzchniach narzędzi materiały powłokowe.

EN

Producing of multifunctional layers and coatings on tools is possible with the use of glow-discharge nitriding and PVD technologies. The intention of authors is to consider the traditional and new plasma duplex magnetron HIPIMS technologies . Ideas of the glow-discharge nitriding technology on the plasma potential and supplementary plasma potential are synthetically described. Already existing and new PVD technologies and processes of producing of coating materials on tool surfaces are characterized.

3

Computer simulation of stresses in coatings obtained in the PVD process

Śliwa A., Kwaśny W., Dobrzański L. A.

Inżynieria Materiałowa

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2010

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Vol. 31, nr 3

732-734

EN

The paper presents application of the Finite Element Method for determining the internal stresses occurring in the Ti+Ti(Al,N) coatings obtained in the magnetron PVD process on the PM HS6-5-3-8 type sintered high-speed steel. The model was developed using FEM, relevant for the investigated test pieces, for the computer simulation of the internal stresses in coatings, which was verified experimentally by comparing the calculation results with the experimental results.

PL

W pracy przedstawiono zastosowanie metody elementów skończonych do wyznaczania naprężeń własnych występujących w powłokach Ti + Ti- (Al, N), uzyskanych w magnetronowym procesie PVD na spiekanej stali szybkotnącej PM HS6-5-3-8. Dla celów symulacji komputerowej naprężeń własnych w powłokach z wykorzystaniem MES opracowano odpowiedni dla analizowanych próbek model, który poddano weryfikacji doświadczalnej, dokonując porównania wyników obliczeń z wynikami badań eksperymentalnych.

4

Właściwości mechaniczne powłok CrxN

Warcholiński B., Gilewicz A.

Inżynieria Powierzchni

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2009

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Nr 3

27-33

PL

W pracy przedstawiono rezultaty badań powłok CrxN, otrzymanych metodą katodowego odparowania łukowego. Badano powłoki jednowarstwowe: Cr, Cr2N, CrN oraz wielowarstwowe Cr/CrN i Cr2N/CrN. Otrzymane powłoki poddano badaniom rentgenowskim oraz badano przyczepność do podłoży stalowych metodą rysy. Określono ich twardość oraz współczynnik tarcia i odporność na zużycie w skojarzeniu z alundem. Rezultaty badań wskazują, że wszystkie powłoki charakteryzują się dobrą adhezją z siłą krytyczną Lc2 wyższą niż 70 N. Najlepsze właściwości użytkowe, najwyższą twardość około 22 GPa i najniższy wskaźnik zużycia 3x10-' mm3/Nm, posiadają powłoki wielowarstwowe CrzN/CrN. Powłoki wielowarstwowe CrzN/CrN otrzymywano przy różnych temperaturach j.: 300 OC i 400 OC. Niższą wartością twardości charakteryzrjct się powłoki wie~ Loiuarstwowe otrzymane w wyższej temperaturze.

EN

The results of investigations of CrN coatings deposited using cathodic are evaporation are shown in the paper. The monolayer Cr, Cr2N and CrN coatings and two multilayer Cr/CrN and Cr2N/CrN coatings were tested. XRD, adhesion to steel substrates, hardness, friction coefficient and wear rate were determined. The results indicate, that all coatings show good adhesion with critical force Lc2 higher than 70 N. The best utility properties, the highest hardness about 22 GPa and the lowest wear rate 3x10-7 mm3/Nm, show multilayer Cr2N/CrN coatings. The deposition tests of multilayer CrzN/CrN coatings at different substrate temperature, 300 OC i 400 OC, show that at lower temperature the coatings are of higher hardness.

5

The computer simulation of internal stresses on the PVD coatings

Śliwa A., Dobrzański L.A., Kwaśny W., Sitek W.

Archives of Computational Materials Science and Surface Engineering

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2009

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Vol. 1, nr 3

183-188

EN

Purpose: The general topic of this paper is the computer simulation with the use of finite element method for determining the internal stresses in coatings Ti+TiN, Ti+Ti(CxN1-x) i Ti+TiC obtained in the magnetron PVD process on the sintered high-speed steel of the ASP 30 in different temperatures of 460, 500 and 540°C Design/methodology/approach: Modelling of stresses was performed with the help of finite element method in ANSYS environment, and the experimental values of stresses were determined basing on the X-ray diffraction patterns. Findings: The presented model meets the initial criteria, which gives ground to the assumption about its usability for determining the stresses in coatings, employing the finite element method using the ANSYS program. The computer simulation results correlate with the experimental results. Research limitations/implications: To evaluate with more detail the possibility of applying these coatings in tools, further computer simulation should be concentrated on the determination of other properties of the coatings for example-microhardness. Originality/value: Nowadays the computer simulation is very popular and it is based on the finite element method, which allows to better understand the interdependence between parameters of process and choosing optimal solution. The possibility of application faster and faster calculation machines and coming into being many software make possible the creation of more precise models and more adequate ones to reality.

6

The computer simulation of stresses in the Ti+TiC coatings obtained in the PVD process

Dobrzański L. A., Śliwa A., Kwaśny W., Sitek W.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

241--244

EN

Purpose: The aim of the research is the computer simulation of the internal stresses in bilayer coatings Ti+TiC obtained in the magnetron PVD process on the ASP 30 sintered high-speed steel. Design/methodology/approach: Computer simulation of stresses was carried out in ANSYS environment, using the FEM method and the experimental values of stresses were determined basing on the X-ray diffraction patterns. Findings: The computer simulation results correlate with the experimental results. The presented model meets the initial criteria, which gives ground to the assumption about its usability for determining the stresses in coatings, employing the finite element method using the ANSYS program. Research limitations/implications: In order to evaluate with more detail the possibility of applying these coatings in tools, further computer simulation should be concentrated on the determination of other properties of the coatings for example- microhardness. Originality/value: Presently the computer simulation is very popular and it is based on the finite element method, which allows to better understand the interdependence between parameters of process and choosing optimal solution. The possibility of application faster and faster calculation machines and coming into being many software make possible the creation of more precise models and more adequate ones to reality.

7

Prognozowanie mikrotwardości powłok PVD na podstawie symulowanych odkształceń plastycznych

Śliwa A., Dobrzański L.A., Kwaśny W.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

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2005

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Z. 82

155-159

PL

W artykule przedstawiono możliwość zastosowania metody elementów skończonych do prognozowania mikrotwardości powłok Ti+TiN uzyskanych w magnetronowym procesie PVD na spiekanej stali szybkotnącej typu ASP30. Porównano wyniki symulacji komputerowej z wynikami eksperymentalnymi mikrotwardości powłok Ti+TiN. Symulację komputerową odkształceń plastycznych, na podstawie których wyznaczono mikrotwardość, przeprowadzono w środowisku ANSYS, przy wykorzystaniu metody elementów skończonych.

EN

In the paper the possibility of using Finite Element Method (FEM) to forecast microhardnesses of the Ti+TiN coating obtained in the PVD process of the ASP 30 sintered high steel specimen has been presented. The results of the calculated hardness have been compared to experimental results. The computer simulation of plasticity deformations on the basis which microhardness has been pointed out has been carried out in ANSYS 6.1 programme by the use of the Finite Element Method.