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    Wyświetlanie 1-4 z 4
    Tytuł:
    Analysis the Influence of Steel Sheet Production Technology on the Quality Products in Steel Service Polska
    Autorzy:
    Sitko, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2064650.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    production
    material
    steel
    quality
    defects
    Opis:
    The process of production and processing and preparation for distribution of steel products is associated with the requirements of maintaining appropriate procedures. They allow, in accordance with industry standards to avoid unforeseen problems associated with the preparation, implementation and finalization of activities aimed at achieving the intended purpose, which is a finished product of adequate quality and customer satisfaction. It is not always possible in the production process to meet all the requirements and technological, organizational and human factor recommendations. The analysis of selected problems, which includes the content of the article allows to significantly determine the factors and parameters associated with the preparation and technical implementation affecting the implementation of the intended objectives of the company, i.e. achieving an appropriate level of quality and minimizing the defects in the process of steel sheet preparation. Analysis of selected parameters was made on the basis of data obtained in the company operating on the international market Company Steel Service Poland. At the request of company representatives, the name has been changed due to the production data used in the article, which may be considered as sensitive. The article contains data based on research carried out in Steel Service Poland. Selected problems are the subject of analysis of steel sheets cutting processes with the analysis of causes of customer complaints with reference to the produced steel products. Selected steel grades and factors affecting the efficiency of the technological process are presented. The analysed set of factors translates into the level of product quality and reduction of arising defects.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 301--308
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of cavitation erosion on austenitic-ferritic steel
    Autorzy:
    Krawczyk, J.
    Jasionowski, R.
    Ura, D.
    Goły, M.
    Frocisz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/135269.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    cavitation
    austenite destabilization
    duplex steel
    erosion wear
    plastic deformation
    material
    Opis:
    Cavitation is a one of many wear mechanisms which are related to the flow of liquid. It is one of the most destructive wear methods for stainless materials. The local changes in the pressure of the liquid stream related to the flow across the metal component cause straightening of the surface area, as well as its erosion and the formation of pits on the surface layer. The erosion value of cavitation is related to the material’s microstructure, the geometry of the element, the phase composition of the material and the surface roughness. In this paper the investigation of the cavitation process for duplex stainless steel has been performed. Samples examined in the first stages of the experiments were not significantly changed, but after a long time the hardness increase was very visible. The result of the cavitation was also cracking along the interphase boundaries, which resulted in the chipping of the material. One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time. At first plastic micro deformation of the material’s surface occurred, then the plastic deformation increased significantly and after some time this resulted in erosion of the material and interfacial boundary decohesion; these two effects increased simultaneously. The last of the mechanisms was mechanical destabilization of the austenite, but the clear result of the mechanical destabilization of the austenite was only observed in the last sample. Martensitic transformation of the material changed the material’s mechanical properties, but for the stainless steels this resulted in electrochemical corrosion of the material, especially through the formation of an electrochemical potential between austenite and martensite.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 30-35
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The causes of the damage to the bearing rope – failure analysis
    Autorzy:
    Peterka, Pavel
    Krešák, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/101967.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    steel wire rope
    cargo cable ways
    quality
    material
    failure analysis
    lina stalowa
    sposoby przewozu ładunków
    jakość
    materiał
    analiza awarii
    Opis:
    In our laboratory we quite often experience problems with the operation of steel ropes. There is a range of causes related to lifetime problems of ropes. These problems are related to poor quality of input material used for wire production, mixing of different wire strengths in the rope construction, improper roping of the rope into the hoist system, improper rope operation, improper rope design for a particular type of operation as well as unfair practices of vendors. The subject of the article is the analysis of the rope showing the combination of a large number of the above factors leading to the damage of the rope. During the operation of the cargo cableway, the hauling ropes were damaged in a very short time. The Z wires from the surface layer of the rope started to release from the rope. Subsequently, the wires were unwinding from the layer, they created visible protuberant waves, they were braking and dropping out from the rope. The hauling rope had to be replaced. Than the samples were taken from the rope in order to find out the cause of the rope damage. Mechanical, metallographic and fractographic measurements were performed on the rope. The metallographic and fractographic measurements revealed the material defects of the wires of the rope caused during manufacturing of the Z wires from the surface layer of the hauling rope. The mechanical tests revealed differences in the tensile strength grade the operator required compering to the tensile strength grade the vendor declared. The above mentioned problems unambiguously show that it is appropriate to introduce a mechanical control of the rope properties in advance to its deployment. Checks must be performed by an independent testing laboratory. This procedure overprices inputs needed for the rope replacement. On the other hand, it can reduce the costs when a poor quality rope is deployed. Some of our customers have already adopted this approach. It helped to the increase in the safety of the operation of the mechanisms and it eliminated the problems with exchange and climes on bad quality ropes.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 231-236
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza właściwości materiałów metalicznych stosowanych w prowadnikach elektrod dosercowych
    Analysis of the properties of metal materials used in stymulation electrodes guides
    Autorzy:
    Dobosiewicz, B.
    Jakubas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/268974.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    prowadnik elektrody dosercowej
    elektroda dosercowa
    stymulator serca
    defibrylator serca
    stal nierdzewna
    właściwości materiałowe
    właściwości elektryczne
    cardiac lead guide
    stimulation
    electrodes for cardiac devices
    implanted devices
    alloy steel
    material
    properties
    electrical properties
    Opis:
    Tematem pracy jest analiza materiałowa, analiza właściwości elektrycznych prowadników elektrod dosercowych stosowanych w stymulatorach. Różne elementy prowadników przebadano za pomocą mikroskopu skaningowego oraz mostka RLC. Autorzy wykonali analizę składu chemicznego prowadników elektrod oraz wykreślili charakterystykę impedancji próbek w zakresie częstotliwości kilohercowych. Otrzymane wyniki badań mają na celu zweryfikować przydatność tego typu materiałów do konstrukcji elementów matryc wieloelektrodowych pobudzających komórki nerwowe lub fotoreceptory.
    The subject of the presented studies were material and electrical properties of the components of the electrodes. In the paper presents results of measurements using a scanning microscope and RLC bridge. The authors have analyzed the electrochemical composition of the electrodes and have characterized the impedance characteristics of the samples in the kilohertz frequency range. Basic use of these types of electrodes is found in pacemakers and heart defibrillators, where their task is to impulse the implanted device. The results of the study indicate a similar quality composition of various electrode specimens, typical of surgical steel. Due to the biocompatibility of the materials used and their good electrical conductivity, the authors point to the possibility of using this type of specialist products for the construction of other medicine devices. One application that will be the further direction of research will be the use of cardiac electrodes to develop biosensors and sensory matrices placed inside the body.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 54; 31-34
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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