Autor: Topolska, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Environmental Degradation of Dissimilar Austenitic 316L and Duplex 2205 Stainless Steels Welded Joints
Autorzy:: Topolska, S.
Łabanowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/356004.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: duplex steel 2205
austenitic steel 316L
welded joints
stress corrosion cracking (SCC)
hydrogen embrittlement
Opis:: The paper describes structure and properties of dissimilar stainless steels welded joints between duplex 2205 and austenitic 316L steels. Investigations were focused on environmentally assisted cracking of welded joints. The susceptibility to stress corrosion cracking (SCC) and hydrogen embrittlement was determined in slow strain rate tests (SSRT) with the strain rate of 2.2 × 10⁻⁶ s⁻¹. Chloride-inducted SCC was determined in the 35% boiling water solution of MgCl₂ environment at 125°C. Hydrogen assisted SCC tests were performed in synthetic sea water under cathodic polarization condition. It was shown that place of the lowest resistance to chloride stress corrosion cracking is heat affected zone at duplex steel side of dissimilar joins. That phenomenon was connected with undesirable structure of HAZ comprising of large fractions of ferrite grains with acicular austenite phase. Hydrogen assisted SCC tests showed significant reduction in ductility of duplex 2205 steel while austenitic 316L steel remains almost immune to degradation processes. SSR tests of dissimilar welded joints revealed a fracture in the area of austenitic steel.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 2107-2112
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The effect of gluconic acid secretion by phosphate-solubilizing Pseudomonas putida bacteria on dissolution of pyromorphite Pb5(PO4)3Cl and Pb remobilization
Autorzy:: Topolska, J.
Borowicz, P.
Manecki, M.
Bajda, T.
Kaschabek, S.
Merkel, B. J.
Powiązania:: https://bibliotekanauki.pl/articles/191216.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: pyromorphite
pseudomonas putida
gluconic acid
Pb remobilization
P-induced method
Opis:: The purpose of this study was to investigate the effect of bacterially produced gluconic acid on the dissolution of pyromorphite and Pb remobilization. Pyromorphite Pb5(PO4)3Cl is formed as a product of the phosphate-induced treatment of Pb-contaminated sites. This very stable mineral greatly decreases the bioavailability of Pb. In this study, bacterial and abiotic batch experiments on the dissolution of pyromorphite were carried out. In the microbial experiments, the mineral was dissolved in the presence of the phosphate–solubilizing soil bacterium, Pseudomonas putida. The bacterial growth medium was supplemented with glucose, which under natural condi- tions can be supplied to microbes via symbiosis with plants. P. putida acquired P from pyromorphite and enhanced its dissolution. Elevated Pb concentrations were observed in the suspensions with bacteria. The bacterial secretion of 16.5 mM gluconic acid played a significant role in Pb remobilization; the pH of the solution dropped down from an initial 7.4 to 3.5. In the abiotic experiments, pyromorphite was dissolved at several concentrations of gluconic acid and at an acidic to neutral pH range. Both acidification and formation of stable Pb-gluconate ligands enhanced the dissolution of pyromorphite and caused Pb remobilization.
Źródło:: Annales Societatis Geologorum Poloniae; 2013, 83, 4; 343-351
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of microstructure on mechanical properties and corrosion resistance of 2205 duplex stainless steel
Autorzy:: Łabanowski, J.
Świerczyńska, A.
Topolska, S.
Powiązania:: https://bibliotekanauki.pl/articles/258492.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: duplex stainless steel
stress corrosion cracking
microstructure
ageing
Opis:: This paper presents results of the research on impact of microstructure of austenitic-ferritic steel of duplex type on its mechanical properties and susceptibility to stress corrosion cracking. As showed, improper processing technologies more and more often used in shipbuilding industry for plates and other half-finished products made of duplex steel may cause significant lowering their properties, which frequently makes their replacing necessary. Results of the tests on stress corrosion under tension with low strain rate (SSRT) conducted in an inert and corrosion (boiling magnesium chloride) environment , are presented. It was proved that even minor structural transformations taking place in 500ºC ageing temperature lower corrosion resistance of the steel. Structural transformations occurring in 700ºC temperature to a smaller extent influence susceptibility to stress corrosion of the steel, however they cause drastic drop in its plasticity.
Źródło:: Polish Maritime Research; 2014, 4; 108-112
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Nosema ceranae [Eukaryota: Fungi: Microsporea] - nowy pasozyt pszczoly miodnej Apis mellifera L.
Nosema ceranae [Eukaryota: Fungi: Microsporea] - a new parasite of Western honey bee Apis mellifera L.
Autorzy:: Kasprzak, S
Topolska, G.
Powiązania:: https://bibliotekanauki.pl/articles/840434.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Parazytologiczne
Tematy:: grzyby pasozytnicze
pasozyty zwierzat
Nosema apis
pszczola miodna
parazytologia
Nosema ceranae
Apis mellifera
patogennosc
Źródło:: Annals of Parasitology; 2007, 53, 4; 281-284
0043-5163
Pojawia się w:: Annals of Parasitology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Nosema ceranae [Eukaryota: Fungi: Microsporea] - nowy pasożyt pszczoły miodnej Apis mellifera L.
Nosema ceranae [Eukaryota: Fungi: Microsporea] - a new parasite of Western honey bee Apis mellifera L.
Autorzy:: Kasprzak, S.
Topolska, G.
Powiązania:: https://bibliotekanauki.pl/articles/2144074.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Parazytologiczne
Tematy:: grzyby pasozytnicze
pasozyty zwierzat
Nosema apis
pszczola miodna
parazytologia
Nosema ceranae
Apis mellifera
patogennosc
Opis:: Nosema ceranae was discovered in Apis cerana, Eastern honeybee first. Until recently A. cerana has been considered the only host to this parasite. A few years ago N. ceranae was recorded in honey bee Apis mellifera. It appeared that N. ceranae is more pathogenic for A. mellifera than Nosema apis. This parasite can cause significant losses in bee colonies. Bees die without symptoms observed in nosemosis caused by N. apis such as diarrhea.
Źródło:: Wiadomości Parazytologiczne; 2007, 53, 4; 281-284
0043-5163
Pojawia się w:: Wiadomości Parazytologiczne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Assessment of gold with titanium alloy weldability in conditions of a dental technique laboratory
Autorzy:: Jania, G.
Żmudzki, J.
Topolska, S.
Powiązania:: https://bibliotekanauki.pl/articles/24200598.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: titanium alloy
gold
laser welding
prosthetic
implant denture
microstructure
stop tytanu
złoto
spawanie laserowe
protetyka
proteza implantu
mikrostruktura
Opis:: Purpose: In dental practice, there is necessary to weld gold with titanium under the conditions of a dental technique laboratory, which is difficult. The aim was to assess the weldability of pure gold with the titanium alloy Ti6Al4V using a prosthetic laser welding machine. Design/methodology/approach: Gold wire in a diameter of 0.4 mm made with the use of a jewellery drawbar (GOLDPORT, Szczecin, Poland) was welded to a titanium alloy Ti6Al4V substrate of dental implant abutment screw (MegaGen). Dental laser welding parameters (Bego Laser Star T plus) were 230 V; 6.5 ms; 2.5 Hz; laser spot 0.3 mm, and argon blow. Samples were included in resin, ground (500-4000 SiC), polished (Al2O3 suspension) and etched (Kroll solution) per 20 s before observation under a light microscope. Findings: There were well-welded and poorly joined zones. The discontinuities and voids there were not visible or sparse next to the initial weld point. Dendritic structure at well-welded remelting zones and two-phase microstructure of titanium and Ti3Au phase were found. The heat-affected zone was about of 20 microns. Research limitations/implications: Light microscopy was used, and precise phase identification required further investigations. Weld strength assessment requires further micro-hardness and load-bearing ability tests. Weldability concerns the model system with pure gold. Practical implications: In the case of elements with dimensions below 0.4 mm, the use of a laser with a smaller spot should be considered for better control of the remelting zone and mechanical positioning of the elements in order to stabilize and avoid discontinuities and voids. Originality/value: Prosthetic laser welding with a laser spot about of 0.3 mm allows to obtain well-welded parts of 0.3 mm in diameter under stable stitching conditions and higher than 0.4 mm in dimensions.
Źródło:: Archives of Materials Science and Engineering; 2022, 118, 1; 36--41
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki