Autor: Polkowski, W - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: EBSD Strain Analysis of CuZn10 Cast Alloy During Cavitational Wear
Autorzy:: Jasionowski, R.
Zasada, D.
Polkowski, W.
Tematy:: EBSD method
cavitation
cavitational erosion
strain analysis
metoda EBSD
kawitacja
erozja kawitacyjna
analiza odkształceń; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/380062.pdf Link otwiera się w nowym oknie
Opis:: Microstreams of liquid formed during the implosion of cavitation bubbles and the effects of pressure waves coming from disappearing bubbles are the main causes of damage of the washed surface, leading to loss of material (the cavitation erosion). Repeated cavitation implosions cause non-uniform stress state resulting in the strengthening of the surface layer, change of micro-geometry and surface cracks leading to detachment of the material particles. Course of cavitation erosion process depends on the effects of plastic deformation at the beginning of the destruction. The aim of this study was analysis of plastic deformation by EBSD method of CuZn10 cast alloy at the beginning of the cavitation destruction process.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Destruction Mechanism of Z10400 Zn-based Alloy Subjected to Cavitational Erosion
Autorzy:: Jasionowski, R.
Zasada, D.
Polkowski, W.
Tematy:: zinc alloy
cavitation wear
Electron Backscattered Diffraction (EBSD)
stop cynku
zużycie kawitacyjne
dyfrakcja elektronów wstecznie rozproszonych; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/380734.pdf Link otwiera się w nowym oknie
Opis:: Z10400 zinc-based alloy has a very good casting properties and high resistance to corrosion. These two advantages make that Z10400 zinc-based alloy is commonly used for cathodic protection of hulls of ships. Cathodic anodes made of Z10400 zinc-based alloy in the propeller and flap rudder areas are also additionally exposed to the cavitation erosion. The aim of this work was to determine the cavitation erosion resistance of Z10400 zinc-based alloy, which is applied as protectors in cathodic protection of hulls of ships. The examination of cavitational erosion was carried out on a jet-impact measuring device. Study of the mechanism of the destruction of Z10400 alloy based on analysis was performed with scanning electron microscope Quanta 3d FEG and electron back scattered diffraction (EBSD) method.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: EBSD Strain Analysis of CuZn10 Alloy in As-cast State and After Plastic Working and Annealing During Cavitational Wear
Autorzy:: Jasionowski, R.
Zasada, D.
Polkowski, W.
Tematy:: Electron Backscattered Diffraction (EBSD)
cavitation wear
strain analysis
dyfrakcja elektronów wstecznie rozproszonych
zużycie kawitacyjne
analiza odkształceń; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/381392.pdf Link otwiera się w nowym oknie
Opis:: Electron backscatter diffraction (EBSD) system in conjunction with scanning electron microscope (SEM) allows performing full material characterization which include analysis of individual grain orientations, crystal orientation, global and local texture, phase identification and distribution or microstrain mapping. EBSD technique may be also applied for assessing lattice strain introduced during local plastic deformation due to its close relationship with development of dislocation substructure. The aim of this study was analysis of surface deformation by EBSD method of CuZn10 alloy in as-cast state and after plastic working and annealing, with different grain size at the beginning of the cavitation destruction process. The local changes of plastic deformation inside each grain were expressed by Grain Orientation Spread (GOS) and Kernel Average Misorientation (KAM) parameters.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Destruction Mechanism of ZnAl4 as Cast Alloy Subjected to Cavitational Erosion Using Different Laboratory Stands
Autorzy:: Jasionowski, R.
Polkowski, W.
Zasada, D.
Tematy:: cavitation
cavitation wear
alloy ZnAl
cast alloy
destruction mechanism
kawitacja
zużycie
stop ZnAl
stop żeliwa
destrukcja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/381763.pdf Link otwiera się w nowym oknie
Opis:: The main reason of a cavitational destruction is the mechanical action of cavitation pulses onto the material’s surface. The course of cavitation destruction process is very complex and depends on the physicochemical and structural features of a material. A resistance to cavitation destruction of the material increases with the increase of its mechanical strength, fatigue resistance as well as hardness. Nevertheless, the effect of structural features on the material’s cavitational resistance has been not fully clarified. In the present paper, the cavitation destruction of ZnAl4 as cast alloy was investigated on three laboratory stands: vibration, jet-impact and flow stands. The destruction mechanism of ZnAl4 as cast alloy subjected to cavitational erosion using various laboratory stands is shown in the present paper.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Effect of Crystalographic Texture on Cavitation Wear Resistance of As-Cast CuZn10 Alloy
Autorzy:: Jasionowski, R.
Polkowski, W.
Zasada, D.
Tematy:: texture
cavitation
cavitation erosion
electron backscatter diffraction
EBSD
CuZn10 alloy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355595.pdf Link otwiera się w nowym oknie
Opis:: Analysis of a crystallographic texture (a preferred orientation) effect on cavitation wear resistance of the as-cast CuZn10 alloy, has been conducted in the present paper. The experiment was conducted on the CuZn10 alloy samples with <101>//ND or <111>//ND preferred orientations (where the ND denotes direction that is perpendicular to the exposed surface). The cavitation resistance examinations have been carried out on three different laboratory stands (namely, vibration, jet-impact and flow stands) that are characterized by a various intensity and a way of cavitation’s excitement. Obtained results point towards a higher cavitation resistance of the CuZn10 alloy with the <111>//ND preferred orientation.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Wyniki badań nad nową odmianą kostrzewy trzcinowej
Rezultaty ispytanijj novogo sorta ovsjanicy trostnikovidnojj
Results of tests of a new tall fescue variety
Autorzy:: Goral, S.
Sybilska, A.
Polkowski, W.
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/795064.pdf Link otwiera się w nowym oknie
Opis:: Испытания проведенные в Радзикове с сортом Рахеля показали возможность достижения урожая 13 т сухого вещества с гектара. Рассматриваемый сорт характеризуется очень ранним началом роста и равномерным распределением урожаев.
The tests carried out at Radzików on the Rahela variety have proved the possibility of getting the cut yield reaching 13 t of dry matter from hectare. This variety is characterized by a very early growth start and uniform distribution of yields.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: The effect of aluminum content on the microstructure and cavitation wear of feal intermetallic alloys
Autorzy:: Jasionowski, R.
Zasada, D.
Polkowski, W.
Tematy:: intermetallic alloys
cavitation
cavitation wear
Electron Backscattered Diffraction (EBSD)
stopy międzymetaliczne
kawitacja
EBSD; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/386821.pdf Link otwiera się w nowym oknie
Opis:: Intermetallic-based alloys (so called intermetallics) of the Fe-Al binary system are modern construction materials, which in re- cent decades have found application in many branches of the power, chemical and automotive industries. High resistance of FeAl based alloys to cavitational erosion results first of all from their high hardness in the as-cast state, large compressive stresses in the material, as well as homogeneous structure. In the present paper, the effect of aluminum content on the microstructure, texture and strain imple- mented upon cavitation wear of FeAl intermetallic alloys, have been analyzed by field emission gun scanning electron microscopy (FEG SEM) and electron backscatter diffraction (EBSD) analysis. Obtained results of structural characterization indicates that with increasing aluminium content effects of orientation randomization (weakening of <100>//ND casting texture), grain refinement and rising of mechani- cal strenght (and so cavitational resistance) take place.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by LENS Technique
Autorzy:: Łazińska, M.
Durejko, T.
Polkowski, W.
Tematy:: FeAl intermetallics
nano-Al2O3 addition
Laser Engineered Net Shaping; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356020.pdf Link otwiera się w nowym oknie
Opis:: Results of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl₂O₃ (n-Al₂O₃) particles by the LENS method and a subsequent characterization of the as received materials’ structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool. The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al₂O₃ content. Although, indirect methods revealed influence of n-Al₂O₃ addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al₂O₃ significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al₂O₃ causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al₂O₃ addition. Four times lower increase of samples mass was noticed for sample with the n-Al₂O₃ addition as compared to the pure Fe40Al intermetallic alloy.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: A comparison of various imaging modes in scanning electron microscopy during evaluation of selected Si/refractory sessile drop couples after wettability tests at ultra-high temperature
Autorzy:: Polkowska, A.
Warmuzek, M.
Kalarus, J.
Polkowski, W.
Sobczak, N.
Tematy:: scanning electron microscopy
sessile drop method
silicon
refractories
in-lens detectors; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Powiązania:: https://bibliotekanauki.pl/articles/391383.pdf Link otwiera się w nowym oknie
Opis:: In this work, FEI Scios^TM field emission gun scanning electron microscope (FEG SEM) equipped with a unique combination of analytical and imaging detectors was utilized to examine structure and chemistry of selected Si/ refractory couples. The couples were obtained in wettability tests performed by the sessile drop method coupled with contact heating of a refractory substrate (h-BN, SiC) at ultra-high temperature (up to 1750°C). The SEM observations were carried out on top-views of the couples, in order to evaluate surface and interfacial phenomena in Si/h-BN and Si/SiC systems. A full range of available detectors (e.g. classical Everhart-Thornley detector (ETD) or advanced in-lens detectors) working under various operation modes (secondary electrons (SE), backscattered electrons (BSE), a mixed mode), were used upon analyses in order to reveal specific features of obtained structures.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Bioimpedance vector pattern in women with breast cancer detected by bioelectric impedance vector analysis. Preliminary observations
Autorzy:: Malecka-Massalska, T.
Chara, K.
Smolen, A.
Kurylcio, A.
Polkowski, W.
Lupa-Zatwarnicka, K.
Wydawca:: Instytut Medycyny Wsi
Powiązania:: https://bibliotekanauki.pl/articles/50874.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "Polkowski, W" wg kryterium: Autor