Abstract
In the study described here, rapid heating was adopted to obtain ferrite/martensite dual-phase (DP) steels. An understanding of structure-property relationship was obtained through electron microscopy. The average ferrite grain size of steel with heating rate of 300 °C/s (HRA) was refined from 10.2 µm to 4.3 µm as compared to the conventional heating rate of 5 °C/s (CA) during continuous annealing. The morphology of martensite was changed from network-type along the ferrite grain boundaries to uniform distribution in the final DP microstructure. The HRA steel exhibited excellent mechanical properties, Rm = 712 MPa, Rp0.2 = 438 MPa, UEL = 15.7% and TEL = 23.3% and the product of strength and ductility (Rm × TEL) is 17,650 MPa %. In comparison to the conventional continuous annealed steel (CA), there was 8.4% increase in ultimate tensile strength and 10.4% increase in total elongation. The variations of strength, elongation, strain hardening behavior and fracture mechanism for steel subject to different heating route are discussed in relation to the microstructure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
