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Wpływ procesu ciągnienia na własności mechaniczne stali TWIP

100%

Muskalski Z. , Stradomski Z. , Pilarczyk J. , Suliga M. , Herian J.

tom Vol. 72, nr 2

107-109

W pracy przedstawiono wyniki badań procesu ciągnienia drutu ze stali TWIP. Określono podatność tej stali na odkształcenie plastyczne w procesie ciągnienia oraz określono jego własności mechaniczne, sposób umacniania się oraz strukturę. Stwierdzono, że struktura wysokomanganowego austenitu mimo szybkiego umacniania się stali umożliwia odkształcanie go w procesie ciągnienia do około 76 %, a otrzymany w tym procesie drut odznacza się wysokimi własnościami mechanicznymi i dużą twardością.

The investigation of drawing process of TWIP steel wires was shown in this paper. It was defined the susceptibility TWIP steel on plastic strain and described its mechanical properties, work hardening and structure. It was found that in spite fast hardening TWIP steel because of high contain of manganese, it is possible to drawing this steel with total draft 76 % and received in this process wire shows high mechanical properties and high hardness.

TWIP mechanism in processing of high-manganese austenitic steel

80%

Dobrzański L. A. , Borek W. , Mazurkiewicz J.

tom Vol. 71, nr 1

22--27

Purpose: The aim of this paper is to determine the high-manganese austenite propensity to twinning induced by the cold working and its effect on structure and mechanical properties, and especially the strain energy per unit volume of new developed high-manganese Fe-Mn-(Al,Si) high-manganese austenitic TWIP (TWinning Induced Plasticity) steel containing about 25% Mn, 1% Si, 3% Al. Design/methodology/approach: The essence of the research concerns the analysis of the influence of microstructure evolution during cold plastic deformation. The microstructure of investigated steel was determined in metallographic investigations using light, scanning and high- resolution transmission electron microscopies (HRTEM). Findings: The activation of intensive mechanical twinning mechanisms in high-manganese austenitic steels, in order to increase strain energy, allows the formation of technological components of complex shape or permits the discharge of energy during cold plastic deformation. According to currently presented views, it is believed that the new austenitic steels with the A1 crystallographic structure containing Mn more than 25 mass.%, Si and Al can provide a significant advance, particularly in automotive applications, because practically there are no more possibilities to improve at the same time the strength and ductility of the steel with A2 crystallographic structure. Research limitations/implications: Results obtained in static conditions for new developed high-manganese austenitic steel indicate the possibility and purposefulness of their employment for constructional elements of vehicles, especially of the passenger cars to take advantage of the significant growth of their strain energy per unit volume which guarantee reserve of plasticity in the zones of controlled energy absorption during possible collision resulting from activation of twinning induced by cold working, which may lead to significant growth of the passive safety of these vehicles' passengers. Originality/value: TWIP steels show not only excellent strength, but also have excellent formability due to twinning, thereby leading to an excellent combination of strength, ductility, and formability over conventional dual-phase steels.