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The term dual phase steels, or DP steels, refers to a
class of high strength steels which is composed of two phases;
normally a ferrite matrix and a dispersed second phase of
martensite, retained austenite and/or bainite. Martensite phase
fraction, morphology, and phase distribution play an important
role on mechanical properties and fracture behaviour of DP
steel. DP steels were developed in the 1970s. The development
was driven by the need for new high strength steels without
reducing the formability or increasing costs. In particular, the
automotive industry has demanded steel grades with a high
tensile elongation to ensure formability, high tensile strength to
establish fatigue and crash resistance, low alloy content to ensure
weldability without influencing production cost. For years later,
the demand for DP steels is still strong. Materials that can
combine high strength and good formability and thus reduce the
weight of vehicles and other products give an environmental and
economic advantage. In this study, plate shaped specimen was
used. The specimens were subjected to normalization annealing
at 850 °C for 1 hour and cooled in air at room temperature. The
specimens were inter-critical annealed at 740°C, 750 °C, 760°C
and 770°C for 1 hour and quenched in water at room
temperature. Light microscope and SEM were used for the
microstructural investigations. Changes of microstructure
properties and material hardness were investigated due to
different heat treatment conditions. The tensile test was applied
to the samples to determine mechanical properties and the
results were discussed.
International Iron & Steel Symposium
UDCS
Mustafa Çöl
Ersoy Erişir
Funda Gül Koç
Burak BARUTÇUOĞLU