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2 2024

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Innovative acoustic emission method for monitoring the quality and integrity of ferritic steel gas pipelines

Świt Grzegorz, Ulewicz Małgorzata, Pała Robert, Adamczak-Bugno Anna, Lipiec Sebastian, Krampikowska Aleksandra, Dzioba Ihor

Production Engineering Archives

2024

Vol. 30, Iss. 2

233--240

This article presents a comprehensive improvement in the experimental analysis of cracking processes in smooth and sharp V-notched samples taken from gas transport pipelines, utilizing the acoustic emission (AE) method. The research aimed to establish a robust correlation between the failure mechanisms of uniaxially tensile samples and the distinct characteristics of AE signals for enhanced quality management in pipeline integrity. The study encompassed materials from two different straight pipe sections, encompassing both long-term used materials and new, unused materials. Through the application of the k-means grouping method to AE signal analysis, we achieved the identification of AE signal parameters characteristic of various stages of the material destruction process. This advancement introduces a significant improvement in monitoring and managing the operational safety of pipeline networks, offering a methodology that leverages advanced acoustic emission signal analysis. The outcomes present significant implications for the pipeline industry by proposing methods to enhance safety systems and more effectively manage the integrity and quality of gas infrastructure.

Mikrostruktura i charakterystyki mechaniczne staliwa G17CrMo5-5

Pała Robert, Dzioba Ihor, Furmańczyk Piotr

Energetyka

2024

nr 11

467--468

W artykule przedstawiono wyniki badań przeprowadzonych w celu wyznaczenia charakterystyk wytrzymałościowych i odporności na pękanie na próbkach ze staliwa G17CrMo5-5. Badania wykonano w zakresie temperatur od –80ºC do 20ºC. Testowano staliwo w stanie wyjściowym i po modyfikacji metalami ziem rzadkich. Uzyskane rezultaty wskazują na wzrost charakterystyk mechanicznych staliwa w wyniku zastosowanej modyfikacji. Najbardziej istotny wzrost zanotowano dla odporności na pękanie. Powodem są zmiany mikrostruktury oraz kształtu cząstek wtrąceń w staliwie po modyfikowaniu.

The article presents the results of tests carried out on the specimens of G17CrMo5-5 cast steel to determine the strength characteristics and fracture toughness. The tests were performed in the temperature range from –80ºC to 20ºC. The steel was tested in its original state and after modification of rare earth metals. The results obtained indicate an increase in the mechanical characteristics of the steel as a result of the applied modification. The most significant increase was noted for fracture toughness. The reason for this are changes in the microstructure and shape of the inclusion particles in the steel after modification.