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    Wyświetlanie 1-6 z 6
    Tytuł:
    Comparison of Microstructure and Mechanical Properties of Cast Steel Carried out on Cast-on Samples and Samples Cast Separately
    Autorzy:
    Kalandyk, B. E.
    Zapała, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837717.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast steel
    cast-on samples
    heat treatment
    mechanical properties
    metallography
    staliwo
    próbki odlewu
    obróbka cieplna
    właściwości mechaniczne
    metalografia
    Opis:
    The results of microstructure examinations and UTS, YS, El, RA carried out on low-carbon cast steel containing 0.15% C. The tests were carried out on specimens cut out from samples cast on a large-size casting and from samples cast in separate foundry moulds. It has been shown that significant differences in grain size observed in the material of the separately cast samples and cast-on samples occur only in the as-cast. In the as-cast state, in materials from different tests, both pearlite percent content in the structure and mean true interlamellar spacing remain unchanged. On the other hand, these parameters undergo significant changes in the materials after heat treatment. The mechanical properties (after normalization) of the cast-on sample of the tested cast steel were slightly inferior to the values obtained for the sample cast in a separate foundry mould. The microscopic examinations of the fracture micro-relief carried out by SEM showed the presence of numerous, small non-metallic inclusions, composed mainly of oxide-sulphides containing Mn, S, Al, Ca and O, occurring individually and in clusters.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 81-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Vanadium Microaddition on the Strength of Low-Carbon Cast Steel at Elevated Temperatures
    Autorzy:
    Kalandyk, B. E.
    Zapała, R. E.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/946865.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-carbon cast steel
    microaddition elements
    mechanical properties
    temperature
    staliwo niskowęglowe
    elementy mikrododycji
    właściwości mechaniczne
    temperatura
    Opis:
    The effect of vanadium microaddition on the strength of low-carbon cast steel containing 0.19% C used, among others, for castings of slag ladles was discussed. The tested cast steel was melted under laboratory conditions in a 30 kg capacity induction furnace. Mechanical tests were carried out at 700, 800 and 900°C using an Instron 5566 machine equipped with a heating oven of ± 2°C stability. Non-standard 8- fold samples with a measuring length of 26 mm and a diameter of 3 mm were used for the tests. It has been shown that, compared to cast steel without vanadium microaddition, the introduction of vanadium in an amount of 0.12% to unalloyed, low carbon cast steel had a beneficial effect on the microstructure and properties of this steel not only at ambient temperature but also at elevated temperatures when it promoted an increase in UTS and YS. The highest strength values were obtained in the tested cast steel at 700°C with UTS and YS reaching the values of 193 MPa and 187.7 MPa, respectively, against 125 MPa and 82.8 MPa, respectively, obtained without the addition of vanadium. It was also found that with increasing test temperature, the values of UTS and YS were decreasing. The lowest values of UTS and YS obtained at 900°C were 72 MPa and 59.5 MPa, respectively, against 69 MPa and 32.5 MPa, respectively, obtained without the addition of vanadium.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 79-83
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat Treatment on the Microstructures 20%Cr-21%Ni-5%Si Cast Steel
    Autorzy:
    Kalandyk, B.
    Kasińska, J.
    Olejnik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381678.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic cast steel
    stainless steel
    cast steel microstructure
    heat treatment
    staliwo austenityczne
    stal nierdzewna
    mikrostruktura staliwa
    obróbka termiczna
    Opis:
    The study describes the effect of heat treatment on the microstructure of cast high-alloyed 20%Cr-21%Ni-5%Si steel. It has been found that the microstructure of the tested material in the initial state consists of an austenitic matrix and precipitates rich in Si, Cr, Ni and Mn, characterized by different morphology and distributed mainly along the grain boundaries. The conducted heat treatment (after solutioning at: 1060, 1100 and 1200ºC) has changed both morphology and chemical composition of the precipitates. Significant reduction in the Si and Ni content and slight increase in the Cr content, especially after solutioning at 1200°C, combined with a simultaneous decrease in the hardness of the precipitates was evidenced.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 39-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nurses’ generalized self-efficacy in relation to their workplace
    Autorzy:
    Kalandyk, H.
    Penar-Zadarko, B.
    Krajewska-Kułak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1917819.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Nurses
    work
    self-efficacy
    Opis:
    Introduction: Self-efficacy in nurses appears to be of great importance, and is one of the indicators of behaviour Purpose: Nurses’ self-assessment of their generalized self-efficacy in relation to their workplace. Material and methods: The study involved random sample of 570 nurses. A diagnostic survey was carried out using the standardized Generalized SelfEfficacy Scale (GSES). Results: The average value of self-efficacy amounted to 29.3±30. Among the respondents, 56.8% represented category of “high efficacy”, whereas others were of “average efficacy” (32.3%) and “low efficacy” (10.9%). The overall assessment of the nursing profession was higher in participants who presented higher values on GSES scale (R=0.12). The average general level of satisfaction in terms of 20 aspects of professional work was connected with self-efficacy which proved statistically significant. Analysis of self-efficacy score did not indicate statistically significant differences among workplaces. Conclusion: Over half of the participants represented the category of “high efficacy”. The group of nurses employed in district hospitals presented the least instances of low self-efficacy assessment. Individuals who were satisfied with their nursing professional development opportunities had a higher self-efficacy. The higher the perception of self-efficacy, the higher the workplace satisfaction. The average level of satisfaction resulting from various aspects of nursing profession depended on the perception of selfefficacy in the following areas of assessment: professional development opportunity, decisionmaking autonomy, sense of purpose at work, and, to a lesser extent, occupational safety, maintaining work-life balance, and the possibility of communicating with people.
    Źródło:
    Progress in Health Sciences; 2016, 6(2); 92-99
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perception of the psychosocial working conditions in a group of nurses working in hospitals and primary health care
    Autorzy:
    Kalandyk, H.
    Penar-Zadarko, B.
    Krajewska-Kułak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918303.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Nurse
    place of work
    psychosocial conditions
    Opis:
    Introduction: In the nurses group, it is required to have great psychosocial skills, guaranteeing the high quality of professional services. Purpose: To assess the psychosocial working conditions of nurses, depending on their place of employment. Material and methods: The study involved 570 randomly selected nurses. It was based on a diagnostic survey using a standardised questionnaire of Psychosocial Working Conditions (PWC). Results: Correlation factors between the overall and average level of satisfaction with the work were quite high – exceed 0.30 and even 0.40. The greater was the need for change, the lower was the job satisfaction. High sense of self-control at work, social support, or wellbeing was linked with better ratings. Psychophysical requirements were assessed as the worst, and the least frequent were the additional requirements resulting from the conflict nature of the job and overload. Nurses from voivodeship hospitals rated their work lower in the category of intellectual demands, and nurses from the Primary Health Care - in the category of requirements resulting from the conflict nature of the job and overload. Behavioural control and the need for change were different for PHC and the other two hospitals. Psychological wellbeing in district hospitals was worse than in the other two types of medical institutions. Conclusions: The larger was the sense of work control, or sense of social support, the higher was the job satisfaction. The higher the level of requirements and the need for change, the lower was the satisfaction of the assessed aspects of work. There were clear differences in the assessment of the psychosocial working conditions of nurses from hospitals and nurses from PHC.
    Źródło:
    Progress in Health Sciences; 2016, 6(2); 100-108
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Innovation technology for the production of massive slag ladles at the Krakodlew S.A. Foundry. Presentation of design works on research and development
    Autorzy:
    Paszkiewicz, M.
    Guzik, E.
    Kopyciński, D.
    Kalandyk, B.
    Burbelko, A.
    Gurgul, D.
    Sobula, S.
    Ziółko, A.
    Piotrowski, K.
    Bednarczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840919.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    slag ladles
    ductile cast iron
    cast steel
    large castings
    massive castings
    kadzie żużlowe
    żeliwo sferoidalne
    staliwo
    odlewy wielkogabarytowe
    Opis:
    This article is a description of the progress of research and development in the area of massive large-scale castings - slag ladles implemented in cooperation with the Faculty of Foundry Engineering of UST in Krakow. Slag ladles are the one of the major castings that has been developed by the Krakodlew (massive castings foundry) for many years. Quality requirements are constantly increasing in relation to the slag ladles. Slag ladles are an integral tool in the logistics of enterprises in the metallurgical industry in the process of well-organized slag management and other by-products and input materials. The need to increase the volume of slag ladles is still growing. Metallurgical production is expected to be achieved in Poland by 2022 at the level of 9.4 million Mg/year for the baseline scenario - 2016 - 9 million Mg/year. This article describes the research work carried out to date in the field of technology for the production of massive slag ladles of ductile cast iron and cast steel.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 67-71
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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