Unravelling the mechanical behaviour of advanced multiphase steels isothermally obtained below Ms

摘要: Abstract The initial formation of athermal martensite was proven to accelerate the subsequent bainite kinetics during isothermal holdings below martensite-start temperature (Ms). presence prior (PAM) within phase mixture is expected modify overall mechanical response these newly-designed multiphase steels. Differences stem not only from balance product phases, but also effect tempering PAM with variations in applied holding time. This work investigates time on behaviour and, as consequence, microstructures. Results show that, for short times (several minutes), yields similar as-quenched while, longer times, its yielding becomes comparable one exhibited by typical tempered martensite. Furthermore, use Kocks-Mecking curves analysis performance confirms bainitic character isothermally formed Ms. Tailoring bainitic-martensitic microstructure Ms enables obtain advanced steels properties those conventional steels, shorter processing due acceleration formation.