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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Plastic behaviour and microstructure characterization high manganese aluminium alloyed steel for the automotive industry

Kuc D., Cebulski J.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 51, nr 1

14--21

Purpose: Automotive industry constantly demands high-strength steels which are characterized by the energy absorption possibilities during a collision. Such materials may, in the future, replace the currently used conventional steels. The groups of steels which meet these criteria are the austenitic steels and austenitic-ferritic steels with high manganese content (15-30%) and high aluminium content (1-9%). Design/methodology/approach: Susceptibility of steel to cracking at high temperatures was tested on Gleeble 3800 simulator: zero resistance temperature was determined (TZW), zero plasticity temperature was determined (TZP), plasticity reversal temperature was determined (TNP). Research was completed by determination of steel plasticity and stress applying in next stage the deformation of samples in temperature from 850 to 1175°C. This temperature range corresponding with the field of parameters of plastic processing. For samples after tension the ultimate tensile strength was determined (Rm) together with contraction (Z). Character of fractures of stretched samples was tested with the use of scanning microscope Hitachi S-4200. Findings: The tests show that the tested steel is characterised by relatively lower temperatures in comparison with low-alloyed steels. Tested steel has high plasticity in temperature wear to temperature of plastic processing 1150-800°C. Practical implications: The obtained steel is characterised by beneficial properties which outbalance the austenitic steels type TWIP and may be applied in vehicle construction on elements connected with safety. Originality/value: Conducted simulation will be helpful by elaboration of technology of continuous casting and the choice of the right parameters for plastic processing of high-manganese steel with aluminium.