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1

Forecasting in the presence of microstructural changes for the case of P91 steel after long-term ageing

Zieliński A., Miczka M., Boryczko B., Sroka M.

Archives of Civil and Mechanical Engineering

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2016

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Vol. 16, no. 4

813--824

EN

The statistical analysis of experimental data was presented and the precipitate diameter forecast for selected steel grade was developed in this paper. The investigations of changes in the material microstructure were carried out under high-temperature conditions. Therefore, this material was characterised by increasing instability over time. Long-term ageing tests were carried on P91 steel for 103, 104, 3 × 104 and 7 × 104 h at 600 and 650 °C. The recorded microstructure images allowed the quantitative analysis of precipitates that occur mainly at the former austenite grain boundaries and martensite laths. The statistical distribution forecast was developed for the ageing time of 105 h. The forecasting under the conditions of material structure changes requires repealing classic assumptions adopted in the theory of prediction. Such methodology was proposed in this article. This article is the basis for the development of further research in this field. The proposed methodology can be used for diagnostic purposes and in the equipment failure risk assessment.

2

Determining Ultraviolet Degradation of High-Visibility Warning Clothing With Photochromic Indicators

Pościk A.

International Journal of Occupational Safety and Ergonomics

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2013

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Vol. 19, No. 1

79--86

EN

The main purpose of this study was to select an appropriate photochromic dye and to develop a series of photochromic indicators showing ultraviolet (UV) degradation of selected background materials made from different polymers. The photochemistry of a series of photochromic compounds of oxazine and diarylethenes in thin polystyrene films were studied with spectroscopic methods. This paper also discusses the design and results of tests of UV photochromic indicators for high-visibility clothing.

3

Estimation of safety of straight segments of pipelines for heat and power generating plants according to SINTAP procedures.

Dzioba I.

Archive of Mechanical Engineering

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2004

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Vol. LI, nr 3

317-333

EN

In the paper the assessment of safety of the pipelines elements from the heat and power generating plants of Ukraine made of 12Kh1MF steel has been presented. The SINTAP procedures for failure assessment have been performed assuming two shapes of hypothetical cracks along the straight segments of pipeline. The thermal stresses during the cooling process have been taken into account in the analysis. The analysis has been performed at the first level of SINTAP procedures. Two stages: a) before pipeline operation, and b) after 156000 hours of service work have been analyzed. The comparison of results obtained by other assessment method has been made.

PL

W pracy przeprowadzono ocenę bezpieczeństwa prostoliniowych elementów rurociągów ciepłowniczych wykonanych ze stali 12Kh1MF. Obliczenia wykonano według metodyki SINTAP dla prostoliniowych odcinków rurociągów, zawierających hipotetyczne szczeliny powierzchniowe półeliptyczne i o nieskończonej długości, ulokowane na wewnętrznej ściance rury oraz szczeliny przechodzące na wskroś przez ściankę rury. W artykule analizowano sytuacje podczas stacjonarnego okresu eksploatacji, a także dla przypadku niestacjonarnej eksploatacji - rozgrzewania oraz chłodzenia rurociągu. Analizę przeprowadzono dla materiału w stanie nie eksploatowanym i dla materiału po 156000 godzinach pracy rurociągu. Pokazano, że rezultaty obliczeń dobrze zgadzają się z wynikami uzyskanymi wg innej wcześniej zaproponowanej metodyki.

4

In neutron flucs of steel STN 41 2020

Bella V., Chrapan J., Puskar A.

Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica

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1998

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T. 17, z. 1

23-27

EN

The authors present preliminary results of the interaction of steel STN 41 2020 with the neutron radiation. They introduce unstable nuclides created by nuclear reactions as well as the influence of their gama and beta radiation, and radiation of protons and alpha particles on possible formation of disturbances.

PL

Autorzy przedstawili wstępne rezultaty eksperymentu, którego celem jest określenie sił wzajemnego oddziatywania międzycząsteczkowego w stali STN 41 2020 w warunkach promieniowania neutronowego. Eksperyment taki może służyć określeniu niektórych własności mechanicznych w warunkach np. starzenia się materiału.