Abstract
Dual-phase steel has received much attention as a candidate for non-heat treated steel due to its high strain hardening capability. Present study was performed to examine the optimum microstructure and corresponding heat treatment path revealing excellent cold formability of drawn dual-phase steel. Microstructures were varied by three different heat treatments (or quenching paths), namely intercritical quenching (IcQ), intermediate quenching (ImQ), and step quenching. Resulting microstructures consisted of ferrite and martensite phases, but the volume fraction and morphology were largely varied by the quenching paths. Tensile and compression tests for all three microstructures showed continuous yielding curves with high strain hardening exponent. However, after imposing some amounts of drawing strain, all the specimens were significantly strengthened losing strain hardening capability. Cold formability was studied by estimating both the forming limit and the deformation resistance. The IcQ microstructure showed excellent forming limit and deformation resistance as compared to other two microstructures. It was attributed to the beneficial morphology of the IcQ microstructure, which effectively suppressed crack propagation.
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.
