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1
Content available Possibility of Using the Hydrostatic Burnishing Process in Marine Conditions
Labuda Wojciech, Wieczorska Agata
Advances in Science and Technology. Research Journal
|
2024
|
Vol. 18, no 6
189--205
EN
The publication presents the results of research on the influence of hydrostatic burnishing process on the value of selected parameters of surface roughness, material ratio and surface hardness. The process was carried out on shafts made of X5CrNi18-10 stainless steel. The prepared samples were subjected to a finishing turning process with constant cutting parameters, and then hydrostatic burnishing was performed on the surface. The tests determined the influence of the variable pressure exerted by the ball on the shaft surface. The evaluation of the research results showed a significant increase in hardness in the surface layer and an improvement in surface roughness parameters and material ratio. The machining process was carried out on a conventional lathe.
2
Content available The influence of TIG welding technology on the properties and quality of joints made of dissimilar steels
Wieczorska Agata, Dyl Tomasz
Scientific Journal of Gdynia Maritime University
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2022
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nr 124
20--30
EN
The paper presents a new technology for welding dissimilar steels using the TIG method. Following the welding, the joint was subjected to non-destructive testing, and subsequently a Vickers hardness measurement. The tests were intended to determine whether the newly developed welding technology was properly prepared and if such joints were feasible. This particularly applies to dissimilar materials joined by welding.
3
Content available Influence of graphite as a filler on selected mechanical and structural properties of layered composites with polyester-glass recyclate
Wieczorska Agata, Panasiuk Katarzyna, Bazychowska Sylwia
Journal of KONBiN
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2022
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Vol, 52, iss. 2
1--22
EN
The search for recycling methods of composite materials indicated the possibility of using composites with polyester-glass recyclate as structural elements. The main aim of the article was to analyse the influence of the graphite percentage content on the mechanical and structural properties of such composites. Composite materials were made by hand laminating with 10% polyester-glass recyclate and graphite nano-additive. Samples for the static tensile test were prepared, which was carried out in accordance with the applicable standard on a universal testing machine. The obtained results showed that with the increase in the amount of graphite, the properties of the composite decrease; however, dispropor-tionately to the % of its content.
PL
W ramach poszukiwania metod recyklingu materiałów kompozytowych zauważono możliwość zastosowania kompozytów z recyklatem poliestrowo-szklanym jako elementów konstrukcyjnych. Celem zasadniczym artykułu była analiza wpływu zawartości procentowej grafitu na właściwości mechaniczne i strukturalne takich kompozytów. Wykonano materiały kompozytowe metodą laminowania ręcznego z recyklatem poliestrowo-szklanym w ilości 10%, a także nanododatkiem grafitu. Przygotowano próbki do statycznej próby rozciągania, którą przeprowadzono zgodnie z obowiązującą normą na uniwersalnej maszynie wytrzymałościowej. Uzyskane wyniki wykazały, iż wraz ze wzrostem ilości grafitu właściwości kompozytu maleją, jednakże nieproporcjonalnie do jego procentowej zawartości.
4
Content available Developing technology for the welding of steam turbine steering diaphragms using the submerged arc welding method
Wieczorska Agata, Abramczyk Norbert
Journal of KONBiN
|
2022
|
Vol. 52, iss. 3
233--258
EN
The production process of steam turbine steering disks requires many welded joints of high quality parameters. The article presents the test results obtained in the welding process of elements made of martensitic steel X11CrMo12-1 with a thickness of 160 mm. During the tested process, a weld was made with a welding wire filling with 1% and 9% chromium in the K geometry, a groove height of 65 mm and without full penetration. The research was carried out on a butt joint in a downward position. The joint was subjected to destructive and non-destructive tests, including macroscopic tests. This work was aimed at determining the optimal welding parameters, influencing the improvement of the properties and quality of the joint..
PL
Proces wytwarzania tarcz kierowniczych turbin parowych wymaga wykonania wielu połączeń spawanych o wysokich parametrach jakościowych. W artykule przedstawiono wyniki badań otrzymane w procesie spawania elementów wykonanych ze stali martenzytycznej X11CrMo12-1 o grubości 160 mm. W trakcie badanego procesu wykonano spoinę z wypełnieniem drutem spawalniczym o zawartości 1% i 9% chromu w geometrii K, wysokości rowka 65 mm i bez pełnego przetopu. Badania zostały przeprowadzone na połączeniu doczołowych w pozycji podolnej. Złącze poddano badaniom niszczącym i nieniszczącym, w tym badaniom makroskopowym. Praca miała na celu określenie optymalnych parametrów spawania, wpływających na podniesienie właściwości i jakości wykonanego złącza.
5
Content available Worn-out steam turbine body overhaul technology
Wieczorska Agata
Scientific Journal of Gdynia Maritime University
|
2020
|
nr 113
54--65
EN
The article presents the technology of overhauling a steam turbine body after prolonged operation at high temperatures. Before any repairs are made to such a body, preliminary material tests must be carried out, which will qualify it for scrapping or a revitalisation process, because the material undergoes degradation at creep temperatures. The purpose of the overhaul was to restore the steam turbine body (material grade L20HM) to operational condition.
6
Content available The process of regenerative heat treatment of the valve chamber of the steam turbine
Wieczorska Agata
Journal of KONES
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2019
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Vol. 26, No. 3
243--248
EN
Steel castings are often used in the construction of valve chambers of steam turbines. Stringent requirements are set due to the continuous operation of the material at elevated temperatures, in the order of 300ºC to 600ºC. The material of the valve chamber must be resistant to fatigue-creep changes as well as corrosion. This material must be also resistant to dynamic damage which occures when the turbine is starting and stopping. Dynamic damage is induced by a short-lasting but intense accumulation of localized stresses. The castings of the valve chambers of the steam turbine are usually made from the “three-component” type CrMoV-cast steel. Mentioned castings of the valve chamber are continuously subjected to high temperatures, either constant and periodically variable stresses. Due to this, the degradation process of material of the castings is taking place. It is caused by physicochemical processes such as: creep, relaxation, thermal fatigue, corrosion, erosion and changes in material properties, e.g. displacement of the critical point of brittleness. Finally, first cracks and deformations can be observed in the material during the operation. The art presents the process of revitalization technology of the steam turbine valve chamber which was subjected to long-term operation at high temperatures. The revitalization process is aimed at improving the plastic properties of the material and, as the result, extending its service life. The research presented in the article show that impact strength of the chamber material after revitalization is very high. Also the strength properties of the valve chamber, after revitalization, are high and in line with the requirements. The study show that the revitalization of the valve chamber was carried out correctly and restored the material to plastic deformation.
7
Content available Analysis of possibility of repairing welding of selected of the steam turbines
Wieczorska Agata, Bujko Adrian
Journal of KONES
|
2019
|
Vol. 26, No. 4
265--271
EN
The article presents the results of the study on the possibilities of repair by welding methods of exploitation steam turbine bodies. Two hull were investigation after a lifetime of more than 200.000 hours. Repair welding study were carried out on the L17HMF cast steel body in the immediately after exploitation condition, whereas the L21HMF cast steel body underwent a revitalization after the exploitation, and then the welding repair research were performed. On the material taken from the L17HMF cast steel hull, welding repairs were made by welding the previously cut four grooves measuring 200 mm 50 mm 50 mm, which were simulations of material defected. All samples were made in areas where maximum steam temperatures were operating. Welds were tested with destructive and non-destructive methods to determine their quality and define non-compliances detected. The L21HMF cast steel was subjected to a revitalization process, which consisted the hull in subjecting heat treatment in order to obtain favourable structural changes and improve the strength properties. Non-destructive examinations and hardness tests were carried out on the remedial weld, indicating the required quality of repairing remedial weld. Comparative study is aimed at demonstrating the main welding problems during the repair welding of exploitation steam turbine hulls.
8
Content available remote The possibility of extending the life of cast steel hulls of the steam turbine
Charchalis Adam, Dyl Tomasz, Wieczorska Agata
Journal of KONBiN
|
2019
|
Vol. 49, iss. 3
17--32
EN
The paper presents the analyze the lifetime of the HP steam turbine hull for the EC Gdynia TG1 combined heat and power plant as part of the renovation. The impact of exploitation on changes in mechanical properties of the steam turbine hulls was determined. At the preliminary material tests were carried out, qualifying the hull of the steam turbine to undertake the revitalization process. Then, after non-destructive testing, trepanation samples were taken from the cold zone and the hot hull, which were subjected to mechanical properties tests. The next stage of work was the revitalization process including hardening and tempering. The mechanical properties and metallographic were carried out testing. In the next stage of work, non-destructive testing was performed to detect cracks and a decision was made to repair these areas by welding. The last stage of the work includes an analysis of the vitality of the steam turbine hull after revitalization.
PL
W pracy przedstawiono analizę żywotności kadłuba turbiny parowej WP w elektrociepłowni EC Gdynia TG1 w ramach remontu. Określono wpływ eksploatacji na zmiany własności mechaniczne metalu kadłubów turbiny parowej. Przeprowadzono wstępne testy materiałowe, kwalifikujące kadłub turbiny parowej do podjęcia procesu rewitalizacji. Następnie po badaniach nieniszczących pobrano próbki trepanacyjne ze strefy zimnej i gorącej kadłuba, które poddano badaniom mechanicznym. Kolejnym etapem pracy był proces rewitalizacji, w tym hartowanie i odpuszczanie. Następnie przeprowadzono badania metalograficzne i wytrzymałościowe, a w dalszej kolejności badania nieniszczące w celu wykrycia pęknięć i podjęto decyzję o naprawie tych obszarów przez spawanie. Ostatni etap prac obejmuje analizę żywotności kadłuba turbiny parowej po rewitalizacji.
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