Wyniki wyszukiwania - BazTech

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Badania wpływu pełzania na niskocyklową trwałość zmęczeniową

Mroziński Stanisław, Lis Zbigniew

Energetyka

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2019

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nr 11

760--762

PL

W artykule przedstawiono wyniki badań próbek ze stali P91 w warunkach różnych sekwencji obciążenia zmiennego oraz pełzania w temperaturze T = 600°C. Analiza porównawcza wyników badań wykazała, że kolejność występowania obciążenia zmiennego oraz pełzania w programie ma wpływ na trwałość zmęczeniową.

EN

The paper presents results of the steel P91 latigue tests in variable load and creeping at T = 600°C. Comparative analysis of test showed that the order of variable loading and creeping program affect life of material.

2

Changes In Properties and Microstructure of High-Chromium 9-12%Cr Steels Due to Long-Term Exposure at Elevated Temperature

Zieliński A., Dobrzański J., Purzyńska H., Golański G.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 2B

957--964

EN

This paper presents the characteristics of the performance of P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-2) steels used for condition assessment of the pressure components of boilers with supercritical steam parameters. Studies on the mechanical properties, microstructure tests using scanning and transmission electron microscopy, and X-ray analysis of the phase composition of precipitates were performed for selected steels in the as-received condition and after long-term annealing. These steel characteristics are used for the evaluation of the microstructural changes and mechanical properties of the material of components after long-term service. The result of this study is the database of material characteristics representing the mechanical properties related to the microstructure analysis and it can be used for diagnosis of the components of pressure parts of power boilers.

3

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.

4

Badania nowych materiałów na elementy kotłów o nadkrytycznych parametrach pracy

Dobrzański J., Zieliński A., Purzyńska H., Dziuba-Kałuża M.

Prace Instytutu Metalurgii Żelaza

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2015

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T. 67, nr 2

106--111

PL

Celem pracy było przedstawienie wybranych charakterystyk materiałowych dotyczących zmian właściwości wytrzymałościowych odniesionych do zmian strukturalnych zachodzących w stali podczas długotrwałej eksploatacji w warunkach pełzania. W opracowaniu mającym charakter przeglądowy zawarte zostały dane dotyczące stali stosowanych do budowy kotłów nadkrytycznych. Przedstawiono wybrane wyniki badań stali T23 (7CrWVMoNb9-6), T24 (7CrMoVTiB10-10), P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) VM12 (X12CrCoWVNb12-2-)2 w stanie wyjściowym oraz po długotrwałej ekspozycji w warunkach pełzania.

EN

The purpose of the paper was to present selected material characteristics with regard to changes in strength properties related to structural changes occurring in steel during long-term service under creep conditions. This review includes data concerning steels used for construction of supercritical boilers. Selected test results are presented for T23 (7CrWVMoNb9-6), T24 (7CrMoVTiB10-10), P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-)2 steels in initial state and after long-term exposure under creep conditions.