Investigation of Transformation Induced Plasticity in High Al–low Si TRIP Steel

This study was conducted in order to investigate the influence of plastic deformation on the transformation ofretained austenite in a trip steel with a high content of al and a low content of si. to the aim, appropriatetreatments were used to produce the starting material (trip steel). the microstructure of the obtained steel wascomposed of bainite and phases including ferrite and retained austenite. afterwards, 40 % plastic deformation wasapplied to the starting material using a rolling machine. microhardness test, microstructural investigations anddetermination of volume fraction of retained austenite by x-ray diffraction method before and after 40% cold workdemonstrated that the volume fraction of retained austenite in the starting material was decreased as the plasticdeformation was increased. during the plastic deformation, large grains of retained austenite were transformed tomartensite while the small ones tended to be stable.