Prediction of the properties of PVD/CVD coatings with the use of FEM analysis

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 tool’s 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.

Section: Resultsmentioning

confidence: 99%

“…The finite element method makes it possible to understand the relationships among various factors better and makes it possible to select the optimum solution [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Internal Stresses in PVD Coated Tool Composites

Śliwa

Mikuła

Gołombek

et al. 2016

“…At present, the time of operation of the majority of Polish power stations and heat and power generating plants, frequently beyond 200,000 h, results in aiming the main efforts to maintain the level of electric energy production in Poland at the extension of operation much beyond the design work time with simultaneous modernisation of boilers and turbines in order to improve their technical and economic indicators (by increasing the power and improving the efficiency and availability), extend their service life, and, above all, reduce the emission of harmful pollutants to the atmosphere, water and soil [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The Service Life of the Repair Welded Joint of Cr-Mo / Cr-Mo-V

Sroka¹,

Zieliński²,

Mikuła³

2016

This paper presents the evaluation of the service life of dissimilar repair welded joint from Cr-Mo/Cr-Mo-V steel after 200,000 h service under creep condition. The investigations of microstructure using scanning electron microscopy, investigations of mechanical properties at room and elevated temperature as well as creep tests of the basic material from Cr-Mo and Cr-Mo-V steel and welded joint from these steels were carried out. The investigations allowed the time of further safe operation of the repair welded joint in relation to the residual life of the materials to be determined. The evaluation of residual life and disposable residual life, and thus the estimation or determination of possible time of further safe operation, is crucial when the elements are operated much beyond the design work time.

“…Sintered high-speed steels are important group of engineer materials. They are in use in production of cutting tools for hard-treatment materials [11][12][13][14][15].These steels work with large efficiency at required high working coefficients of reliability. Numerous scientific investigations showed, that influence on considerable improvement of tools exploitation persistence has the covering of tools with thin layer with the help of physical of-settling from gas-phases PVD (physical vapor deposition) techniques [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation of the Relationship between Selected Properties of PVD Coatings

Śliwa

Kwaśny

Sitek

et al. 2016

The possibility to apply the Finite Element Method to calculate internal stresses which occur in Ti+TiN, Ti+Ti(CxN1-x) and Ti+TiC coatings obtained in the magnetron PVD process on the sintered high-speed steel of the PM HS6-5-3-8 type. For the purpose of computer simulation of internal stresses in coatings with the use of MES, the correct model of analyzed specimens was worked out and then it was experimentally verified by comparison of calculation results with the results of computer simulation. Accurate analysis of correlations indicated especially strong dependence between internal stresses and microhardness and between microhardness and erosion resistance what created conditions for establishing the dependence between internal stresses obtained in the result of computer simulation and erosion resistance as basic functional quality of coating. It has essential practical meaning because it allows to estimate predictable erosion resistance of coating exclusively on the base of the results of computer simulation for used parameters in the process of coating manufacturing.