Cyclic shear behavior of austenitic stainless

• Autorzy: Geijselaers B. , Bor T. , Van Den Boogaard T..

Warianty tytułu

PL

Zachowanie się blach z austenitycznej stali nierdzewnej poddawanych cyklicznym obciążeniom ścinającym

• Języki publikacji: EN

Abstrakty

EN

An austenitic stainless steel has been subjected to large amplitude strain paths containing a strain reversal. During the tests, apart from the stress and the strain also magnetic induction was measured to monitor the transformation of austenitc to martensite. From the in-situ magnetic induction measurements an estimate of the stress partitioning among the phases is determined. When the strain path reversal is applied at low strains, a classical Bauschinger effect is observed. When the strain reversal is applied at higher strains, a higher flow stress is measured after the reversal compared to the flow stress before reversal. Also a stagnation of the transformation is observed, meaning that a higher strain as well as a higher stress than before the strain path change is required to restart the transformation after reversal. The observed behavior can be explained by a model in which for the martensitic transformation a stress induced transformation model is used. The constitutive behavior of both the austenite phase and the martensite is described by a Chaboche model to account for the Bauschinger effect. In the model mean-field homogenization of the material behavior of the individual phases is employed to obtain a constitutive behavior of the two-phase composite. The overall applied stress, the stress in the martensite phase and the observed transformation behavior during cyclic shear are very well reproduced by the model simulations.

PL

Próbki z austenitycznej stali nierdzewnej poddawano od-kształceniom o dużej amplitudzie i przeciwnych zwrotach. W przeprowadzonych doświadczeniach, poza pomiarem naprężenia i odkształcenia, mierzono również indukcję magnetyczną do monitorowania przemiany austenitu w martenzyt. Dzięki bezpośrednim pomiarom indukcji magnetycznej możliwe było oszacowanie wielkości naprężenia w poszczególnych fazach materiału. Przy małych odkształceniach, dla przeciwnego zwrotu, obserwowany jest klasyczny efekt Bauschingera. Gdy dokonywana jest zmiana zwrotu przy większych odkształceniach, mierzone naprężenie jest większe niż przed zmianą. Obserwowana jest również stagnacja przemiany fazowej, to znaczy, że potrzebne jest wyższe odkształcenie i naprężenie niż przed zmianą ścieżki odkształcania aby ponownie zaczęła się przemiana po zmianie. Zaobserwowane zachowanie można opisać modelem, w którym dla przemiany martenzytycznej ma zastosowanie model naprężenia indukowanego przemianą. Zachowanie konstytutywne austenitu i martenzytu zostało opisane modelem Chaboche'a uwzględniającym efekt Bauschingera. W modelu wykorzystano metodę homogenizacji dla opisu materiału i faz, otrzymując konstytutywny model zachowania się dwu-fazowego kompozytu. Przyłożone naprężenie, naprężenie w fazie martenzytu i obserwowane zachowanie się podczas przemiany w trakcie cyklicznego ścinania zostało bardzo dobrze odtworzone w symulacjach modelu.

Słowa kluczowe

EN

metastable austenite; deformation induced martensite; constitutive model

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2015
• Tom: Vol. 15, No.1
• Strony: 13--22
• Opis fizyczny: Bibliogr. 33 poz., rys.

Twórcy

autor

Geijselaers B.

• Universiteit Twente, Engineering Technology, POBox 217, 7500AE Enschede, Netherlands

autor

Bor T.

• Universiteit Twente, Engineering Technology, POBox 217, 7500AE Enschede, Netherlands

autor

Van Den Boogaard T..

• Universiteit Twente, Engineering Technology, POBox 217, 7500AE Enschede, Netherlands

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