Physical simulation and dilatometric study of double-step heat treatment of medium-Mn steel

• Autorzy: Skowronek A. , Morawiec M. , Ruiz-Jimenez V. , Garcia-Mateo C. , Grajcar A.

Identyfikatory

DOI

10.1007/s43452-020-00144-9

• Języki publikacji: EN

Abstrakty

EN

The work addresses physical simulation and dilatometric study of one-step and double-step heat treatments of medium-Mn steel designed for automotive sheets. The conventional one-step isothermal bainitic transformation was applied as the reference heat treatment. The newly implemented heat treatment consisted of isothermal holding in a bainitic region followed by additional holding of the material at reduced temperature also in the bainitic range. This step was added to refine the microstructure, which led to the stabilization of the retained austenite. Calculations of equilibrium state and non-equilibrium cooling and simulations of the developed thermal cycles were performed using the thermodynamic JMatPro software. The physical simulations of the heat treatment were performed in the dilatometer. The obtained samples were subjected to microscopic observations using light and SEM microscopy. One- and two-step heat treatments allowed to obtain bainitic structures with high contents of retained austenite. Lowering the temperature of one-step isothermal holding resulted in the bainite refinement and adjacent retained austenite. The increased Mn content in steel increased its susceptibility to form coalesced bainite resulting in the partial formation of thicker plates despite a decrease in a process temperature.

Słowa kluczowe

EN

dilatometric study; medium-Mn sheet steel; complex microstructure; bainitic transformation; retained austenite

PL

blacha stalowa; mikrostruktura; austenit

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 4
• Strony: 578--588
• Opis fizyczny: Bibliogr. 49 poz., rys., wykr.

Twórcy

autor

Skowronek A.

• Department of Engineering Materials and Biomaterials, Silesian University of Technology, Konarkiego 18a St., 44-100 Gliwice, Poland

autor

Morawiec M.

• Department of Engineering Materials and Biomaterials, Silesian University of Technology, Konarkiego 18a St., 44-100 Gliwice, Poland

autor

Ruiz-Jimenez V.

• National Center for Metallurgical Research, Av. de Gregorio del Amo 8, 28040 Madrid, Spain

autor

Garcia-Mateo C.

• National Center for Metallurgical Research, Av. de Gregorio del Amo 8, 28040 Madrid, Spain

autor

Grajcar A.

• Department of Engineering Materials and Biomaterials, Silesian University of Technology, Konarkiego 18a St., 44-100 Gliwice, Poland

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)