Autor: Pakula, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of heat treatment on micro structural changes in aluminium bronze
Autorzy:: Hájek, J.
Křiž, A.
Chocholaty, O.
Pakuła, D.
Powiązania:: https://bibliotekanauki.pl/articles/356861.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium bronzes
heat treatment
microstructure
EDS
corrosion resistance
Opis:: Effect of heat treatment on micro structural changes in aluminium bronze This paper attempts to summarise the niicrostructural changes which take place in aluniiniuni bronzes during heat treatment. Another objective of this study was to map the potential of a certain type of aluminium bronzes for undergoing martensitic transformation. The methods, which were chosen for assessing the results of heat treatment with regard to their availability, included measurement of hardness and observation of inicrostructure using light and scanning electron microscopy. Additional tools for evaluation of microstructure comprised measurement of microhardness and chemical analysis by EDS. An important part of the experiment is observation of microstructural changes in the Joniiny bar during the end-quench test. Upon completing experiments of this kind, one can define the heat treatment conditions necessary for obtaining optimum properties. In addition, the paper presents important findings on how to improve the corrosion resistance of aluminium bronzes by special heat treatment sequences.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1271-1276
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Structure and properties of the tool ceramics with hard wear resistant coatings
Autorzy:: Pakuła, D.
Staszuk, M.
Gołombek, K.
Śliwa, A.
Mikuła, J.
Powiązania:: https://bibliotekanauki.pl/articles/351856.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PVD coatings
Nitride Tool Ceramics
Sialon Tool Ceramics
Opis:: This work presents studies of the structure and functional properties of coatings deposited onto indexable inserts made of nitride and sialon tool ceramics with the required properties, i.e. high adhesion, niicrohardness. high resistance to abrasive and diffusion wear in working conditions of high-performance cuttings tools. In the present paper the results of the investigations of the structure, texture, mechanical and functional properties of the Ti(C,N), (Ti.Al)N, Ti(C.N)+(Ti,Al)N coatings were presented. The 80% increase in the hardness of the coatings in comparison to the substrate material was reported. Test coatings are characterized by good adhesion to the substrate. The maximum Lc load of (Ti A1)N coat applied to the substrate from the nitride ceramics is equal to 42 N. In the studied coatings compressive stresses were found. The results of mechanical properties investigations, especially tribological ones correlate with the results of exploitation tests carried out during the cutting test.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1265-1270
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Internal stresses in PVD coated tool composites
Autorzy:: Śliwa, A.
Mikuła, J.
Gołombek, K.
Kwaśny, W.
Pakuła, D.
Powiązania:: https://bibliotekanauki.pl/articles/355303.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: analysis and modelling
computational materials science
finite element method
stresses
coatings PVD
Opis:: 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.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1371-1378
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Finite Element Prediction for the Internal Stresses of (Ti,Al)N Coatings
Autorzy:: Żukowska, L. W.
Śliwa, A.
Mikuła, J.
Bonek, M.
Kwaśny, W.
Sroka, M.
Pakuła, D.
Powiązania:: https://bibliotekanauki.pl/articles/354118.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: analysing and modelling
PVD coatings
gradient coatings
internal stresses
Opis:: The general topic of this paper is the computer simulation with use of finite element method (FEM) for determining the internal stresses of selected gradient and single-layer PVD coatings deposited on the sintered tool materials, including cemented carbides, cermets and Al₂O₃+TiC type oxide tool ceramics by cathodic arc evaporation CAE-PVD method. Developing an appropriate model allows the prediction of properties of PVD coatings, which are also the criterion of their selection for specific items, based on the parameters of technological processes. In addition, developed model can to a large extent eliminate the need for expensive and time-consuming experimental studies for the computer simulation. Developed models of internal stresses were performed with use of finite element method in ANSYS environment. The experimental values of stresses were calculated using the X-ray sin2ψ technique. The computer simulation results were compared with the experimental results. Microhardness and adhesion as well as wear range were measured to investigate the influence of stress distribution on the mechanical and functional properties of coatings. It was stated that occurrence of compressive stresses on the surface of gradient coating has advantageous influence on their mechanical properties, especially on microhardness. Absolute value reduction of internal stresses in the connection zone in case of the gradient coatings takes profitably effects on improvement the adhesion of coatings. It can be one of the most important reasons of increase the wear resistance of gradient coatings in comparison to single-layer coatings.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 149-152
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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