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    Wyświetlanie 1-6 z 6
    Tytuł:
    Changes of stainless steels surface morphology as a result of interaction with intense pulsed plasma beams containing ions of rare earth elements
    Autorzy:
    Sartowska, B.
    Piekoszewski, J.
    Waliś, L.
    Składnik-Sadowska, E.
    Barlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146323.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intense plasma pulses
    stainless steel
    surface modification
    REE addition
    Opis:
    Among different methods used in surface engineering such as CVD, PVD, ion implantation etc., the techniques using high intensity ion or plasma beams are relatively new ones. The results reported thus far show that the treatment of steel surface with high intensity plasma pulses can lead to changes of its morphology and mechanical properties. Stainless steels have very good corrosion resistance, but they have low hardness and poor tribological properties. The intense pulsed plasma beams were used for modification of alloyed steels especially austenitic (1.4301 and 1.4401) and ferritic (1.4016) stainless steels with various content of alloying elements. Samples were irradiated with 2, 5 or 10 short (μs scale) intense (density of energy was about 5 J/cm2) pulses. Heating and cooling processes were of non-equilibrium type. In all samples the near surface layer of the thickness in μm range was melted and simultaneously doped with cerium and lanthanum. The aim of this work was to investigate the changes of stainless steel surface morphology after melting, rare earth elements (REE) addition and rapid solidification after interaction with intense pulsed plasma beams. The surface morphology was analyzed using a scanning electron microscopy (SEM) technique. Changes of surface roughness were determined by profilometric measurements. The efficiency of REE addition process was also determined.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 43-48
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C
    Autorzy:
    Sartowska, B.
    Piekoszewski, J.
    Waliś, L.
    Barlak, M.
    Starosta, W.
    Pochrybniak, C.
    Bocheńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503944.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.-j
    72.15.Eb
    81.65.Mq
    Opis:
    It is well documented that the high oxygen affinity elements such as Y, Ce, La, Er and other rare earth elements added to steel in small amounts can improve their high temperature oxidation resistance. Rare earth elements can be either alloyed during the steel making process or introduced through surface treatment techniques. Improvement of high temperature oxidation resistance of AISI 316 L steel by incorporation Ce and La elements into its near surface region using high intensity pulsed plasma beams in so-called deposition by the pulse erosion mode was investigated in the present work. The samples were irradiated with 3 short (μs scale) intense (energy density $3 J//cm^2$) plasma pulses. Heating and cooling processes occur under non-equilibrium conditions. In all samples the near surface layer of the thickness in μm range was melted and simultaneously doped with cerium and lanthanum. The modified samples were oxidized at 1000°C for 100 h in air. The obtained effects were: oxide scales formed on the treated samples were more fine-grained, compact and adhering better that those formed on the un-treated samples.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 83-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of nuclear techniques for characterization of materials surfaces : own investigations examples
    Autorzy:
    Sartowska, B.
    Piekoszewski, J.
    Waliś, L.
    Starosta, W.
    Barlak, M.
    Nowicki, L.
    Ratajczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146726.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    conversion electron Mössbauer spectroscopy (CEMS)
    nuclear reaction analysis (NRA)
    nuclear techniques
    surface characterization
    surface modification
    Opis:
    Different methods and techniques for material characterization are often used as a standard procedure for the determination of material properties. Nuclear techniques provide new and more detailed information about the investigated materials. The main goal of the carried out experiments was to improve surface properties including wear, corrosion and high temperature oxidation resistance. Modification processes were carried out using high intensity pulsed plasma beams - HIPPB (106-108 W.cm-2) generated in a rod plasma injector (RPI). In most solid materials such treatment leads to a fast transient melting of the surface layer of the substrate followed by rapid crystallization. Heating and cooling processes are of non-equilibrium type. Initial and modified materials were characterized using different investigation methods including nuclear techniques. Results of the used nuclear techniques such as nuclear reaction analysis (NRA), Rutherford backscattered spectroscopy (RBS) and conversion electron Mössbauer spectroscopy (CEMS) are presented in the paper.
    Źródło:
    Nukleonika; 2012, 57, 4; 521-528
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wettability of carbon and silicon carbide ceramics induced by their surface alloying with Zr and Cu elements using high intensity pulsed plasma beams
    Autorzy:
    Barlak, M.
    Piekoszewski, J.
    Sartowska, B.
    Waliś, L.
    Starosta, W.
    Kierzek, J.
    Pochrybniak, C.
    Kowalska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146789.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    wettability
    ceramic-metal joints
    high intensity pulsed plasma beams (HIPPB)
    Opis:
    Joining of metals with ceramics is very difficult, because properties of these materials are very different. One of the methods of improving mechanical strength of the obtained joints is the introduction of an additional interlayer to the joining area. This paper presents the Zr and Cu-rich layers in C and SiC substrates obtained using the high intensity pulsed plasma beams method. The results of Zr plasma modifications were beneficial and similar to the results obtained in previous works with Ti. The measured contact angles were below 90 centigrade. The results with Cu plasma were unfavourable with contact angles close to 180 centigrade. Apart from the sessile-drop test and to extend the range of analysis, the investigated samples were examined by stereoscopic optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS), grazing angle X-ray diffraction (GXRD), and Rutherford back scattering (RBS) measurements.
    Źródło:
    Nukleonika; 2012, 57, 4; 477-483
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of nitrogen atoms in expanded austenite formed in pure iron by intense nitrogen plasma pulses
    Autorzy:
    Piekoszewski, J.
    Sartowska, B.
    Waliś, L.
    Werner, Z.
    Kopcewicz, M.
    Prokert, F.
    Stanisławski, J.
    Kalinowska, J.
    Szymczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147989.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alfa-to-gamma phase transformation in iron
    expanded austenite
    intense nitrogen plasma pulses
    Opis:
    The paper presents the results of experiments on modification of pure iron by high-intensity nitrogen pulsed-plasma treatment. The duration of nitrogen plasma pulses is approximately 1 mi s, and the energy density amounts to about 5 J/cm2. Such pulses are capable to melt the surface layer of the substrate (1- 2 mi m) and to introduce a significant concentration of nitrogen into the molten layer. Nuclear reaction analysis (NRA), X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS) were used for characterisation of the treated samples. The main results of the data analysis are as follows: it has been stated that such treatment leads to gradual transformation of initial alfa-phase into austenitic gamma structure in which expanded austenite gammaN is present. Treatment with 20 pulses results in almost complete transformation and introduces a retained dose of nitrogen estimated as 5.5 × 1017 N/cm2. The susceptibility for expansion of the lattice transformed to austenite in this way is smaller than in the case when the steel subjected to conventional nitriding is originally of austenite type. The analysis of the ratio of alfa to gammaN as a function of the nitrogen content provides a firm evidence that strong repulsion forces act between the first and the second nearest-neighbour nitrogen atoms in the fcc austenitic structure formed as a result of nitriding of pure iron by intense nitrogen plasma pulses.
    Źródło:
    Nukleonika; 2004, 49, 2; 57-60
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High - temperature oxidation resistance in yttrium implanted stainless steel
    Autorzy:
    Barlak, M.
    Piekoszewski, J.
    Werner, Z.
    Sartowska, B.
    Waliś, L.
    Starosta, W.
    Kierzek, J.
    Kowalska, E.
    Wilhelm, R. A.
    Pochrybniak, C.
    Woźnica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146785.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    high-temperature oxidation resistance
    ion implantation
    yttrium
    Opis:
    Austenitic AISI 304, 316L and ferritic 430 stainless steels were implanted with yttrium to fluences ranging between 1 x 1015 and 5 x 1017 ions/cm2. The samples were subjected to oxidation in air at a temperature of 1000 centigrade for a period of 100 h and next examined by stereoscopic optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) and Rutherford back scattering spectrometry (RBS). The results obtained with the use of ion implantation are discussed.
    Źródło:
    Nukleonika; 2012, 57, 4; 473-476
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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