The laboratory simulation of strip casting of dual phase (DP) and transformation-induced
plasticity (TRIP) steels was carried out using heat treatments of dip-cast samples in a dilatometer. The
microstructure of DP steel (0.08C-0.81Si-1.47Mn-0.03Al wt. %) consisted of ~80 % ferrite and
remaining martensite with little of bainite, whereas the microstructure of TRIP steel
(0.17C-1.52Si-1.61 Mn-0.03Al wt. %) consisted of ~65 % ferrite, 4% retained austenite and remaining
bainite and martensite. Small amount of Widmiinstatten ferrite was also observed in both steels. The
uniaxial tensile tests were carried out on sub-sized specimens. DP steel had the ultimate tensile
strength (UTS) of 446 MPa at uniform elongation (e11 ) of 0.17 while TRIP steel had the UTS of 495
MPa at e11 of 0.20, which are lower than those in hot rolled steels. This can be a consequence of cast
microstructure (absence of deformation), large grain size, and presence of some Widmanstiitten ferrite.
In both steels the predominant fracture mode was ductile, with presence of some isolated cleavage
facets associated with the second phase. TRIP steel had a more sustainable increase in strain hardening
exponent than DP steel. Crussard-Jaoul model analysis has shown very weak TRIP effect, probably
because of low amount of retained austenite ( 4% ).