Yazar "Gurun, Hakan" seçeneğine göre listele

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    Microstructure based modelling of stress-strain relationship on dual phase steels
    (Taylor & Francis Ltd, 2019) Cavusoglu, Onur; Toros, Serkan; Gurun, Hakan
    The deformation in microstructures of DP600, DP800 and DP1000 commercial advanced high strength steels have been researched through using the representative volume element method. For this purpose, deformation analyses have been carried out by transferring geometrical models and mechanical properties of phases of each material to the finite element software. Deformation relation between ferrite and martensite phases was determined. According to the loading direction, Shear bands have been observed to occur in the range of approximately 40 degrees-45 degrees. It has been understood that the failure mode is shear for DP600, DP800 and DP1000 steels. Crack propagation has been observed to occur in the ferrite phase trapped at the martensite grain boundary.
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    Öğe
    Warm deformation and fracture behaviour of DP1000 advanced high strength steel
    (Taylor & Francis Ltd, 2018) Cavusoglu, Onur; Toros, Serkan; Gurun, Hakan; Gural, Ahmet
    The effect of temperature has been investigated on the mechanical properties and fracture behaviour of DP1000 advanced high-strength steel. The variation of the mechanical properties depending on temperature has been determined by performing uniaxial tensile tests at the temperatures of 25, 100, 200, 300 degrees C at the rolling directions of 0 degrees (rolling), 45 degrees (diagonal), and 90 degrees (transverse) at the strain rate of 0.0083 s(-1). The yield strength and tensile strength have showed a slight decrease tendency between 25 and 200 degrees C, but the highest value has been reached by showing an increase at 300 degrees C temperature. The amount of elongation has not been affected significantly with the increase of the temperature. While hardening coefficient has increased due to the rising temperature, no effect has been observed on strength coefficient between 25 and 100 degrees C, but an increase has occurred at higher temperature values.