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High ductility of bainite-based microstructure of middle carbon steel 42SiMn

Citace:
KUČEROVÁ, L., BYSTRIANSKÝ, M., JENÍČEK, Š. High ductility of bainite-based microstructure of middle carbon steel 42SiMn. In IOP Conference Series-Materials Science and Engineering. Bristol: IOP PUBLISHING LTD, 2017. s. 1-6. ISBN: neuvedeno , ISSN: 1757-8981
Druh: STAŤ VE SBORNÍKU
Jazyk publikace: eng
Anglický název: High ductility of bainite-based microstructure of middle carbon steel 42SiMn
Rok vydání: 2017
Místo konání: Bristol
Název zdroje: IOP PUBLISHING LTD
Autoři: Doc. Ing. Ludmila Kučerová Ph.D. , Ing. Martin Bystrianský , Ing. Štěpán Jeníček
Abstrakt EN: Heat and thermo-mechanical treatments with various processing parameters were applied to middle carbon low alloyed 42SiMn steel. The aim of the treatment was to obtain multiphase microstructure typical for TRIP (Transformation induced plasticity) steel and to achieve the best combination of ultimate tensile strength and ductility. TRIP steels typically possess about 5-15% of metastable retained austenite, which can transform to martensite during plastic deformation. The gradual phase transformation during loading postpones the onset of necking, thus increasing ultimate tensile strength and ductility at the same time. Manganese and silicon, used as the main alloying elements of the experimental steel, are employed to increase austenite stability and to hinder cementite precipitation during the treatment. All proposed methods of heat and thermo-mechanical treatment contain bainitic hold at 400 °C or 425 °C. The final microstructures were very complex, consisting of bainite, ferrite, very small areas of extremely fine perlite lamellas, about 10% of retained austenite and M-A constituent (austenitic islands partially transformed to martensite). Even though pearlite and martensite are undesirable microstructure in TRIP steel, the tensile strength ranged from 850 to 1065 MPa and ductility A5mm from 26 to 47 %.
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