Abstract
The purpose of the present study is to mitigate the effect of heat-affected zone (HAZ) softening on laser welded dual-phase (DP) steel by modifying the steel microstructure. It was shown that DP steels composed of ferrite, martensite, and blocky retained austenite provide enhanced joint toughness, which could match that of the un-welded base metal. Conversely, a DP steel containing only ferrite and martensite phases exhibited severe reduction in ductility due to HAZ softening. The underlining mechanism relates to the presence of retained austenite to maintain high joint strength and ductility was revealed by investigating the work hardening behaviour under tensile deformation and microhardness distributions across the welds as well as by examining the microstructure using scanning and transmission electron microscopy.
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.
