Wyniki wyszukiwania - BazTech

1

Description of Residual Stress Distribution in the Surface Layer After Heat Treatment and Shot Peening

Skalski Konstanty, Mońka Grzegorz, Filipowski Ryszard

Transactions on Aerospace Research

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2023

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Nr 3 (272)

28--39

EN

The stress distribution function in the surface layer is created as a result of using stress measurements on the surfaces of C45 steel samples after shot peening. Stresses were measured by X-ray diffraction with the use of the PSF-3M device from the Rigaku Company. For measuring residual stresses, subsequent layers of the top surface of the material were used as a basis, and these were obtained through electrochemical etching. The test results i.e. distance into the material, sample hardness, shot type, stress) were entered into the stepwise multiple regression program. A record of residual stresses was obtained in the form of the second-degree regression function of three independent variables with interactions. The obtained analytical form of the residual stress function was used in the FUNVAL3.EXE program to calculate the tabular values of stresses permeating into the material. For the analytical description of the stress distribution, the REGPOLY.EXE regression program was used, which creates a polynomial functional form of the residual stress distribution. The plot form of the residual stress distribution was obtained using the EXCEL Microsoft Office 2000 program.

2

Effect of calcination temperature on the structural, optical and magnetic properties of pure and Fe-doped ZnO nanoparticles

Singh R. P. P., Hudiara I. S., Rana S. B.

Materials Science Poland

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2016

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Vol. 34, No. 2

451--459

EN

In the present study, pure ZnO and Fe-doped ZnO (Zn0.97Fe0.03O) nanoparticles were synthesized by simple coprecipitation method with zinc acetate, ferric nitrate and sodium hydroxide precursors. Pure ZnO and Fe-doped ZnO were further calcined at 450 ºC, 600 ºC and 750 ºC for 2 h. The structural, morphological and optical properties of the samples were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and UV-Vis absorption spectroscopy. The X-ray diffraction studies revealed that the as-synthesized pure and doped ZnO nanoparticles have hexagonal wurtzite structure. The average crystallite size was calculated using Debye-Scherrer’s formula. The particle size was found to be in nano range and increased with an increase in calcination temperature. SEM micrographs confirmed the formation of spherical nanoparticles. Elemental compositions of various elements in pure and doped ZnO nanoparticles were determined by EDX spectroscopy. UV-Vis absorption spectra showed red shift (decrease in band gap) with increasing calcination temperature. Effect of calcination on the magnetic properties of Fe-doped ZnO sample was also studied using vibrating sample magnetometer (VSM). M-H curves at room temperature revealed that coercivity and remanent polarization increase with an increase in calcination temperature from 450 ºC to 750 ºC, whereas reverse effect was observed for magnetization saturation.

3

Characteristics of ZnO thin films deposited by atomic layer deposition

Boryło P., Lukaszkowicz K., Szindler M., Basiaga M.

Journal of Achievements in Materials and Manufacturing Engineering

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2015

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Vol. 73, nr 2

86--91

EN

Purpose:The aim of this article was to examine the adhesion of ZnO thin films and the influence of temperature deposition process on their morphology. ZnO thin films have been deposited by atomic layer deposition. Design/methodology/approach: Adhesion of ZnO thin films was investigated using the scratch test method. Changes in the surface morphology were observed by scanning electron microscope (SEM). In order to confirm the chemical composition and phase investigated of thin films was carried out Energy-dispersive X-ray spectroscopy EDS and X-ray analysis. Findings: Results and their analysis have shown that the ZnO thin films deposited by ALD are uniform and homogenous. Significant impact on their morphology has the temperature of the deposition process. In the case of the adhesion temperature is negligible. Practical implications: Knowledge about the ALD ZnO thin films are possibility to obtaining a uniform thin films show that material has a big potential in optoelectronics and photovoltaic application. Originality/value: The article presents the original research results of the structure and properties of ZnO thin films deposited by ALD method, that can replace a commonly used transparent conductive layer.

4

Qualitative and numerical analysis of chemical composition of selected iron alloys technique wave dispersive spectrometry (WDS) by calibration curves

Pawlyta M., Krzysteczko J., Nieradka B.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 66, nr 1

20--30

EN

Purpose: Purpose of the dissertation was accomplish qualitative and quantitative analysis of chemical composition of selected iron alloys using wavelength-dispersive spectroscopy (WDS) by calibration curve method. In this dissertation information about X-ray microanalysis physical basis and about X-ray detection in scanning electron microscope were presented. Design/methodology/approach: Research was execute on scanning electron microscope, on the X-ray diffraction instrument, on energy and wavelength-dispersive spectrometer. Carbon content and confidence interval at unknown steel sample were determined. Findings: Method of calibration curves allowed the designation of the carbon content of the steel samples of unknown chemical composition, depending on a reflection intensities derived from coal. Performed tests have confirmed the possibility of using this method, even in case of depositing the carbon layer. Originality/value: The paper presents qualitative and numerical analysis of chemical composition of selected iron alloys technique wave dispersive spectrometry (WDS) by calibration curves. Carbon content and confidence interval at unknown steel sample were determined.

5

Badania struktury stopów na bazie magnezu i litu o strukturze dwufazowej α-β i jednofazowej β

Białobrzeski A., Lech-Grega M., Żelechowski J.

Prace Instytutu Odlewnictwa

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2010

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T. 50, z. 1

17-28

PL

W pracy przedstawiono wyniki badań ultralekkich stopów magnezu i litu o strukturze dwufazowej α-β i jednofazowej β z zastosowaniem skaningowej mikroskopii elektronowej z analizą chemiczną w mikroobszarach (SEM + EDX - Philips XL30 + EDAX) i rentgenowskiej analizy fazowej (XRD - dyfraktometr rentgenowski D8 Advance, Bruker). Refleksy dyfrakcyjne zinterpretowano na podstawie katalogu PDF-2. Stwierdzono, że dodatek pierwiastków stopowych, takich jak wapń czy aluminium wyraźnie zmienia strukturę stopu jednofazowego Mg-Li α bądź β. Dodatek wapnia w odlewanym stopie podwójnym Mg-Li-Ca powoduje powstanie struktury dwufazowej składającej się z dendrytów fazy β oraz płytkowej eutektyki CaMg2 i prawdopodobnie fazy α. Dodatek aluminium w odlewanym stopie podwójnym Mg-Li-AI powoduje powstanie materiału dwufazowego α i β. Stop Mg-18,4%Li-1,2%Zn jest stopem jednofazowym β z cynkiem rozpuszczonym w osnowie.

EN

The study presents the results of examinations carried out on ultra-light magnesium- and lithium- based alloys of two-phase α-β structure and monophase β structure using scanning electron microscopy with chemical analysis in microregions (SEM + EDX - Philips XL30 + EDAX) and X-ray phase analysis (XRD - X-ray diffractometer model D8 Advance, Bruker). The diffraction reflexes were interpreted from a PDF-2 catalogue. It was observed that the addition of alloying elements (calcium or aluminium) definitely changes the structure of monophase Mg-Li α or β alloys. Calcium addition to a cast binary Mg-Li-Ca alloy results in the formation of two-phase structure composed of β phase dendrites, lamellar CaMg2 eutectic, and probably α phase. The addition of aluminium to a cast binary alloy from the Mg-Li-AI system results in the formation of a two-phase α and β system. The Mg-18,4%Li-1,2%Zn alloy is a monophase β structure material with zinc dissolved in alloy matrix.

6

Physical and structural characterization of mismatched welded joints by dynamic fracture toughness test.

Ranatowski E., Sadowski J.

Inżynieria Materiałowa

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2001

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R. XXII, nr 5

753-756

EN

An assessment of dynamic fracture parameters such as KId, JId, total failure energy K and their parts Kz, Kr for the experimented conventional and pre-cracked specimens tested by dynamic fracture test were made. The additional investigations by X-ray diffractometer and scanning electron microscope were made to reveal the structural sources of scatter of the results in the Charpy test.

PL

Wykonano ocenę dynamicznych parametrów procesu pękania, takich jak KId, JId, energię zniszczenia K oraz jej składowe Kz, Kr poprzez dynamiczne badania konwencjonalnych próbek oraz z karbem zakończonym pęknięciem. Ponadto wykonano dodatkowe badania na dyfraktometrze rentgenowskim oraz mikroskopie skaningowym w celu ujawnienia strukturalnych źródeł rozrzutu badań obserwowanych w próbce Charpy V.