Dual Phase Steels Flashcards
What are characteristics and applications of dual phase steels?
Characteristics:
High tensile elongation to ensure formability
High tensile strength to establish fatigue and crash resistance
Low alloy content to ensure weldability
They generally do not show a yield point
Plastic strain occurs at relatively low stresses
The initial work hardening (strain hardening) is high
High UTS
Applications:
Automotive industry - bumpers, b-pillars and side impact beams
What do “high strength low alloy” steels contain?
Typically these steels will contain:
➢ 0.06 – 0.12wt% C; 0.4 – 2.5 wt% Mn
➢ Process called “Inter critical Annealing” produces the required
microstructure
➢ At about 720C – 780C, the austenite – ferrite structure is quenched
to form Ferrite and Martensite.
➢ Pearlite (a+Fe3C) and retained austenite, in the structure.