Comparison the effect of Q-P and TRIP heat-treatments on the microstructure and mechanical properties of a high strength steel containing Ti micro-alloy

TRIP and Q-P are the main methods to produce advanced high-strength steels (AHSS). These heat treatment methods are based on the penetration of carbon from martensite to retained austenite (γR) and therefore stabilization of γR. In the present study, a high strength steel containing Ti micro-alloy element heat treated by Q-P, TRIP and direct quenching (Q-T) followed by comparison of their microstructure and mechanical properties. The effect of these treatments on the microstructure and mechanical properties of the steel was studied and compared by by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness and metallography. The results showed that the sample performed by Q-P treatment has a good combination of ductility and strength compared to the sample treated by TRIP. The strength and ductility of the Q-P sample were reported to be 1070 MPa and 24%, respectively. The strength and ductility of the sample obtained from TRIP were reported 1160 MPa and 19%, respectively.