Physical simulation of thermomechanical processing of new generation advanced high strength steels

• Autorzy: Grajcar A. , Kuziak R , Ozgowicz W. , Gołombek K.

Warianty tytułu

PL

Symulacja fizyczna obróbki cieplno - plastycznj nowej generacji stali wysokowytrzymałych

• Języki publikacji: EN

Abstrakty

EN

The scientific aim of the paper is the comparative analysis of the hot-working behaviour and microstructure evolution of thermomechanically processed and controlled cooled three advanced high-strength steels (AHSS) used in the automotive industry. The hot workability of three selected steel grades with a various content of Mn and C being major austenite-forming elements was compared. Evaluation of the resistance for hot deformation was carried out on a basis of continuous compression, double-hit compression, four-step compression and seven-step compression experiments simulating conditions similar to industrial processes. It was found that the hot workability of the new generation of AHSS is very challenging due to high values of flow stresses required. However, it is possible to obtain fine-grained transformation products of supercooled austenite with a high volume fraction of retained austenite for low-alloyed steels or single-phase austenitic microstructure in the high-manganese steel. Thermally activated processes of microstructure restoration which enable for successive grain refinement and affecting final flow stress values were identified. Finally, the comparison of the microstructures characterizing the first, second and third generation of AHSS was carried out. Some similarities and differences concerning the hot deformation behaviour and microstructure detailes are indicated.

PL

Celem naukowym pracy jest analiza porównawcza obróbki plastycznej na gorąco i rozwoju mikrostruktury obrobionych cieplno-plastycznie oraz chłodzonych w kontrolowanych warunkach trzech wysokowytrzymałych stali stosowanych w motoryzacji (AHSS). Przedstawiono porównanie odkształcalności na gorąco 3 wybranych gatunków stali o zróżnicowanej zawartości Mn i C, będących głównymi pierwiastkami austenitotwórczymi. Oceny oporu kształtowania plastycznego dokonano na podstawie prób ściskania ciągłego, ściskania dwuetapowego, cztero-etapowego oraz siedmioetapowego symulującego warunki zbliżone do procesów przemysłowych. Stwierdzono, że odkształcalność na gorąco nowej generacji stali AHSS wymaga zastosowania dużej wartości naprężeń uplastyczniających. Możliwe jest jednak uzyskanie drobnoziarnistych produktów przemiany austenitu przechłodzonego o dużym udziale austenitu szczątkowego w stalach niskostopowych lub jednorodnej strukturze austenitycznej w stali wysokomanganowej. Dokonano identyfikacji aktywowanych cieplnie procesów odbudowy mikrostruktury austenitu pozwalających na sukcesywne jego rozdrobnienie oraz decydujących o końcowej wartości naprężenia płynięcia. Porównano uzyskane mikrostruktury stali charakteryzujące pierwszą, drugą i trzecią generację stali AHSS. Wskazano podobieństwa i różnice dotyczące odkształcalności stali na gorąco oraz szczegółów mikrostrukturalnych.

Słowa kluczowe

EN

physical simulation; thermomechanical processing; AHSS steel; TRIP steel; bainitic steel; high-Mn steel; multiphase steel; retained austenite

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2012
• Tom: Vol. 12, No. 3
• Strony: 115--129
• Opis fizyczny: Bibliogr. 40 poz., rys.

Twórcy

autor

Grajcar A.

• Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Gliwice, Poland

autor

Kuziak R

• Institute for Ferrous Metallurgy, Gliwice, Poland

autor

Ozgowicz W.

• Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Gliwice, Poland

autor

Gołombek K.

• Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Gliwice, Poland

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