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1

The effect of aluminum content on the microstructure and cavitation wear of feal intermetallic alloys

Jasionowski R., Zasada D., Polkowski W.

Acta Mechanica et Automatica

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2014

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Vol. 8, no. 1

49--52

EN

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.

2

EBSD Strain Analysis of CuZn10 Alloy in As-cast State and After Plastic Working and Annealing During Cavitational Wear

Jasionowski R., Zasada D., Polkowski W.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 2 spec.

53--60

EN

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.

3

Destruction Mechanism of Z10400 Zn-based Alloy Subjected to Cavitational Erosion

Jasionowski R., Zasada D., Polkowski W.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 2 spec.

48--52

EN

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.

4

Microstructure evolution of CP titanium during high temperature deformation

Tan M. J., Zhu X. J.

Archives of Materials Science and Engineering

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2007

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Vol. 28, nr 1

5-11

EN

Purpose: To investigate the superplasticity of commercially pure titanium alloy and microstructure evolution of the alloy during high temperature deformation. Design/methodology/approach: Uniaxial tensile tests were carried out at 600, 750 and 800°C with an initial strain rate from 10 -1 s -1 10 -4 s -1. EBSD technology was used to evaluate the microstructure of the commercially pure titanium alloy deformed at high temperature. Findings: It is found that this titanium alloy does not show good superplasticity at 600-800°C due to the rapid grain growth. Studies also show that the dynamic recrystallization took place at high temperatures. The optimum dynamic recrystallization conditions were found to be at 600°C with an initial strain rate of 0.001/s, attaining the highest volume fraction of fine grains whose average grain size is ≈ 9.7 µm at strain of 80%. This process not only decreases the average grain size of the alloy but also increase the misorientation angle of the grain boundary. Practical implications: The investigations of microstructure of the commercially pure titanium alloy as well as related phenomena during high temperature deformation are important for achieving desired mechanical behavior of the material. Originality/value: The dynamic recrystallization phenomenon of commercially pure titanium alloy as well as related mechanism is investigated.

5

Nowe możliwości badania struktury materiałów metodą dyfrakcji elektronów wstecznie rozproszonych

Piątkowski A.

LAB Laboratoria, Aparatura, Badania

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2005

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R. 10, nr 4

21-24

6

Wybrane aspekty zastosowania identyfikacji faz metodą dyfrakcji elektronów wstecznie rozproszonych w inżynierii powierzchni na przykładzie warstw azotonasiarczanych.

Klimek L.

Inżynieria Materiałowa

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2002

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R. XXIII, nr 5

658-661

PL

Poznanie zjawisk zachodzących podczas obróbek cieplno-chemicznych a w szczególności procesów zarodkowania, wzrostu oraz transformacji faz ma istotne znaczenie dla późniejszego projektowania tych procesów dla konkretnych zastosowań. Aby to zrealizować konieczne jest zidentyfikowanie faz powstających na każdym etapie tych procesów. W niniejszej pracy została pokazana, na przykładzie warstw azotonasiarczanych gazowo na wysokostopowych stalach chromowych, możliwość wykorzystania identyfikacji faz metodą dyfrakcji elektronów wstecznie rozproszonych do badania warstw dyfuzyjnych. Badania przeprowadzono na wysokochromowej stali nierdzewnej 4H13 w stanie wyżarzonym poddanej azotonasiarczaniu gazowemu. Na tak otrzymanych warstwach przeprowadzono analizę składu chemicznego metodą rentgenowską oraz identyfikację, metodą dyfrakcji elektronów wstecznie rozproszonych (EBSD), wybranych faz. Przeprowadzone badania wykazały, że dyfrakcja elektronów wstecznie rozproszonych może być cennym narzędziem służącym do określania faz występujących w badanych materiałach. Dzięki niej możemy śledzić procesy zarodkowania i wzrostu faz w procesach obróbek powierzchniowych, a także transformację faz zachodzących podczas tych obróbek. Daje możliwość dość szybkiej identyfikacji fazy na stosunkowo dużych obszarach zarówno na powierzchniach zewnętrznych, jak i na przekrojach badanych preparatów.

EN

A comprehension of the phenomena taking place during thermochemical treatment of steel and during processes of phases' nucleation, growth and transformation in particular, has an essential significance for later design of such processes for specific use. In order to accomplish it, it is necessary to identify phases formed during each stage of these processes. In the present paper, a possibility of utlilization an identification of phases by electron back scattered diffraction (EBSD) method to investigate diffusion of layers is shown on the example of gas sulphonitriding highly alloyed chromium steels. The study was performed on high chromium content stainless steel 4H13 after the process of its gas sulphonitriding. An analysis of chemical composition and an identification of selected phases by electron back scattered diffraction method were carried out on layers obtained in this way. The results show the usefulness of the EBSD method for the phase identification of investigated materials. Thus it is possible to observe processes of phase nucleation and growth taking place in the course of surface treatment as well as those of phase transformations that occur during that treatment, both on external surfaces and on an intersection of sample.