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Study on the influence of sheet straightening process on residual stress distribution, mechanical properties and structure of deep-drawing steel sheets

Radwański Krzysztof, Adamiec Andrzej, Kuziak Roman, Zaława Dariusz, Sozańska-Jędrasik Liwia

Journal of Metallic Materials

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2021

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Vol. 73, no. 4

3--10

EN

The article describes the impact of the stretch levelling process of DC03 and DC04 steel sheets on their quality in terms of further application for products formed in technologies used in the automotive industry. The straightening process was carried out in a demonstration line developed as part of a project carried out by DAR STAL Dariusz Zaława together with the Łukasiewicz Research Network - Institute for Ferrous Metallurgy. The study examined the influence of stretch levelling on waviness and the state of internal stresses of the sheets. It was found that the use of stretch levelling with a controlled elongation value results in obtaining a favourable and stable state of stress in the sheets. No significant influence of the straightening process on the structure and mechanical properties of the sheets was found.

PL

W ramach artykułu opisano wpływ procesu prostowania naciągowego blach ze stali DC03 i DC04 na ich jakość pod kątem dalszego przeznaczenia na wyroby kształtowane w technologiach stosowanych w przemyśle motoryzacyjnym. Proces prostowania prowadzono w linii demonstracyjnej opracowanej w ramach projektu realizowanego przez firmę DAR STAL Dariusz Zaława wspólnie z Sieć Badawcza Łukasiewicz - Instytutem Metalurgii Żelaza. W ramach pracy badano wpływ prostowania naciągowego na falistość i stan naprężeń własnych blach. Stwierdzono, że zastosowanie prostowania naciągowego, z kontrolowaną wartością wydłużenia, powoduje uzyskanie korzystnego i stabilnego stanu naprężenia w blachach. Nie stwierdzono znaczącego wpływu procesu prostowania na strukturę oraz właściwości mechaniczne blach.

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Mechanisms of plastic deformation in light high-manganese steel of TRIPLEX type

Sozańska-Jędrasik Liwia, Borek Wojciech, Mazurkiewicz Janusz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 5

art. no. e137412

EN

In this scientific publication, research results of two newly developed hot-rolled Fe-Mn-Al-C (X105) and Fe-Mn-Al-Nb-Ti-C (X98) types of steel were compared. These types of steel are characterized by an average density of 6.68 g/cm³, a value 15% lower compared to conventional structural steel. Hot rolling was carried out on a semi-industrial line to evaluate the effect of hot plastic deformation conditions with different cooling variants on the structure. The detailed analysis of phase composition as well as microstructure allows us to state that the investigated steel is characterized by an austenitic-ferritic structure with carbides precipitates. The results of the transmission electron microscopy (TEM) tests of both types of steel after hot rolling showed the occurrence of various deformation effects such as shear bands, micro bands, and lens twins in the microstructure. Based on the research undertaken with the use of transmission electron microscopy, it was found that the hardening mechanism of the X98 and X105 steel is deformation-induced plasticity by the formation of shear bands (SIP) and micro shear bands (MBIP).

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Zastosowanie skaningowej mikroskopii elektronowej w badaniach materiałów inżynierskich

Boryło Paulina, Sozańska-Jędrasik Liwia, Gołombek Klaudiusz

LAB Laboratoria, Aparatura, Badania

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2019

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R. 24, nr 2

6--13