Effect of retained austenite characteristics on V-bending in ultrahigh-strength TRIP-aided steel sheets with bainitic ferrite matrix (TBF steel) was investigated for automotive applications. tests were performed a servohydraulic testing machine at processing speed 1 mm/min using 88-degree V-punch (2.0 mm punch radius), V-die (12 die gap, 0.8 shoulder and rectangular specimen (50 length, 5 width...

A novel double annealing process was applied to a Mn-TRIP steel. As result, great combination of yield strength 829MPa, tensile 1132MPa and total elongation 42.1% obtained. The improvement mechanical property contributed microstructure evolution. By process, ferrite grains were refined VC could effectively precipitate instead cementite, which the enhancement strength. Austenite fraction increas...

A medium Mn steel has been designed to achieve an excellent combination of strength and ductility based on the TRIP (Transformation Induced Plasticity) concept for automotive applications. Following six passes of hot rolling at 850 °C, the Fe-7.9Mn-0.14Si-0.05Al-0.07C (wt.%) steel was warm-rolled at 630 °C for seven passes and subsequently air cooled to room temperature. The sample was subseque...

The combination of strength transformation-induced plasticity (TRIP) steel and ductility twinning-induced (TWIP) can be achieved by manufacturing laminated composites via cold roll bonding (CRB). Work hardening the surface before CRB produces deformation lenses (DLs), which play significant role in bonding, but are reported rarely literature. present work aimed to study DLs at interface composi...