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Mechanical Properties of High-Mn Austenitic Steel Tested under Static and Dynamic Conditions

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

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 2A

725--730

The purpose of the paper is to investigate X73MnSiAlNbTi25-1-3 high manganese austenitic steel containing 0.73% C to determine structural mechanisms decisive for increasing a reserve of cold deformation energy of such steel. The influence of a strain rate on the structure of the investigated steels and on the structural mechanisms decisive for their properties was analysed. Specialist research instrumentation was used for this purpose such as Scanning Transmission Microscopy (including EBSD examinations), conventional and high-resolution transmission electron microscopy together with diffraction examinations and metallographic examinations. It was found that the principal cause of an increased reserve of cold deformation energy of the investigated steels in dynamic conditions is the activation of mechanical twinning in the mutually intersecting systems in austenite grains and annealing twins, which are densifying when a cold deformation rate is growing, thereby confirming the basic mechanism of TWIP (TWinning Induced Plasticity).

TWIP mechanism in processing of high-manganese austenitic steel

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

Journal of Achievements in Materials and Manufacturing Engineering

2015

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.