Press formability of hot-rolled 1.4mm thin gauge advanced dual phase steel sheet with tensile strength of 590MPa

摘要

The press formability of hot-rolled 1.4mm thin gauge advanced dual phase steel sheet with tensile strength of 59OMPa for automobile panels and parts was investigated. Hot-rolled thin gauge dual phase steel sheet with excellent mechanicalproperties has been developed by controlling secondary phase optimum. In punch stretching the limit dome height of advanced dual phase steel sheet consisting of ferrite phase and martensite phase was almost same as that of transformation inducedplasticity (TRIP) steel sheet consisting of ferrite phase, bainite phase and retained austenite phase. Both advanced dual phase steel sheet and TRIP steel sheet showed superior formability compared with precipitation hardened steel sheet, especially instretch forming and plain strain deformation.