Surface modification TRIP \ TWIP steels

Abstract

TRIP/TWIP steels have high tensile strength, plasticity, and much higher yield stress then other structural steels. Currently class of TRIP/TWIP steels with austenite-martensite structure is used in highly loaded parts, such as helicopter propeller torsion bars. TRIP steels are most in demand in the automotive industry. However, this steel has a problem with fatigue strength, because martensite of deformation (product of austenite-martensite transformation induced by plastic deformation) is stress concentrator. Surface modification will increase fatigue strength and ductility, as well as high corrosion resistance in aggressive environments. It is supposed to evaluate the effect of a particular chemical element or chemical compound in the interaction with steels with a high austenite content and make first steps towards to technology of Surface modification TRIP\TWIP steels.