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Advanced High Strength Steels (AHSS) grades are currently the fastest growing materials in the
automotive industry. AHSS offer a great potential for the development of automobile bodies with their
mechanical properties of high formability and strength. Dual phase (DP) steels are increasingly
popular AHSS grade in the automotive industry due to the excellent combination of high strength
and good formability. The intercritical annealing of DP steel is generally two-stage heat treatment.
DP steel sheet is annealed in the intercritical temperature range to produce ferrite and
austenite and followed by accelerated cooling to transform the austenite phase to martensite. This
study aims to examine effect of a cyclic intercritical annealing below and above A1 temperature on
DP steel microstructure with comparison to the conventional intercritical annealing. The
specimens were conventional intercritically annealed at different temperatures between 720 °C and
760°C. In cyclic intercritical annealing experiments, the temperature is cycled between 630 °C and an
intercritical annealing temperature without any isothermal holding. After the conventional and
cyclic intercritical annealing, the samples were investigated using light microscope and scanning
electron microscope. Experimental results showed that a refinement of martensite and ferrite dual phase
microstructure compare to conventional intercritical annealing.
International Iron & Steel Symposium
UDCS
Ayşe Kavruk
Oğuz Gürkan Bilir
Özge Ararat
Ahmet Efe Gezmişoğlu