The diagnostics and ways heat treatment optimization of a railway wheels steel

• Autorzy: Vira Volodymyr , Kulyk Volodymyr , Chepil Roman , Kharchenko Yevhen , Duriagina Zoia

Identyfikatory

DOI

10.29354/diag/109605

Warianty tytułu

PL

Diagnostyka i kierunki optymalizacji obróbki ciepłnej stali kół kolejowych

• Języki publikacji: EN

Abstrakty

EN

A high resolution sensor of linear displacements has been elaborated for diagnosing the size of the crack tip opening in standard test specimens. Based on the data measured during fatigue crack growth resistance tests of a wheel steel heat treated after various modes, calculations of the strain and energy parameters of local fracture were performed for the corresponding variants of treatment, and fatigue crack growth rate diagrams were constructed using different approaches of fatigue fracture mechanics. It was established that the diagrams obtained using the strain and energy approaches are more sensitive to material microstructure and its mechanical properties than the traditional diagrams obtained using the stress approach. Based on the parameters of the fatigue crack growth resistance estimated using the strain and energy approaches, the effective diagnostics and the best heat treatment mode for the wheel steel was developed. It comprises the stages of isothermal quenching and tempering at a temperature of 500 °С, providing the highest fatigue fracture toughness of the steel.

PL

Opracowano czujnik przemieszczeń liniowych o podwyższonej czułości dla diagnozowania rozwartości szczeliny na podstawie określenia odkształceń i energetycznych parametrów uszkodzenia lokalnego. W oparciu o różne podejścia mechaniki zniszczenia zmęczeniowego zostały skonstruowane diagramy prędkości propagacji pęknięć zmęczeniowych w stali koła kolejowego po różnych rodzajach obróbki cieplnej. Ustalono, że diagramy odporności na pękanie, otrzymane według odkształceniowego lub energetycznego podejścia, są bardziej wrażliwe do strukturalnych i mechanicznych własności materiałów w porównaniu z tradycyjnymi diagramami otrzymanymi według podejścia siłowego. Pokazano zalety odkształceniowego i energetycznego podejścia w porównaniu z podejściem siłowym w zakresie optymalizacji charakterystyk odporności materiałów na pękanie. Dokonano skutecznej diagnostyki stanu technicznego materiału oraz optymalizacji obróbki cieplnej stali kół kolejowych. Ustalono, że hartowanie izotermiczne z odpuszczaniem przy temperaturze 500°C zapewnia najwyższą odporność stali na pękanie.

Słowa kluczowe

EN

railway wheel steel; local stress; local strain; strain energy; fatigue crack growth

PL

stal kół kolejowych; naprężenia lokalne; odkształcenia lokalne; propagacja pęknięcia zmęczeniowego

• Wydawca: Polskie Towarzystwo Diagnostyki Technicznej
• Czasopismo: Diagnostyka
• Rocznik: 2019
• Tom: Vol. 20, No. 2
• Strony: 105--111
• Opis fizyczny: Bibliogr. 25 poz., rys., tab.

Twórcy

autor

Vira Volodymyr

• Lviv Polytechnic National University, S. Bandery Str. 12, 79013 Lviv, Ukraine

autor

Kulyk Volodymyr

• Lviv Polytechnic National University, S. Bandery Str. 12, 79013 Lviv, Ukraine

autor

Chepil Roman

• Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Naukova Str. 5, 79060 Lviv, Ukraine

autor

Kharchenko Yevhen

• Lviv Polytechnic National University, S. Bandery Str. 12, 79013 Lviv, Ukraine
• University of Warmia and Mazury in Olsztyn, Faculty of Technical Science, Oczapowskiego str. 11, 10-736 Olsztyn, Poland

autor

Duriagina Zoia

• Lviv Polytechnic National University, S. Bandery Str. 12, 79013 Lviv, Ukraine
• The John Paul II Katholic Uniwersity of Lublin, Faculty of Physical Chemistry and Physicochemical Fundamentals of Environmental Engineering, Racławickie Al. 14, 20-950 Lublin, Poland

Bibliografia

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• 3. JIS E5402-1:2005. Railway rolling stock-Solid wheel - Part 1: Quality requirements.
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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).