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The aim of our project:
This project aims to set optimum processing parameters (e.g., cooling rate, isothermal holding temperature, holding time, chemical composition) for the production of bainitic dual phase steels through both isothermal holding and continuous cooling processing techniques.
Further details about the experimental work is covered later in this presentation.
Bainite is named after Edgar C. Bain
Carbon in bainite:
Why bainite ?
The temperature range for transformation to bainite (250–550 °C).
The range of Bainitic alloys available commercially includes
Ultra-low carbon bainitic steels for high weldablity.
Ultra-high strength bainitic steels competing with the quenched and tempered martensitic alloys.
Creep resistant steels which have now been used for decades in the power generation industries.
Forging steels which are better than martensitic alloys because they require muؤh less processing.
Inoculated steels in which the bainite is induced to nucleate intragranularly on particles to produce a chaotic microstructure which resists the propagation of cracks.
Modifications of Bainitic steels:
Micro-structural investigations :
A) Metallographic Preparations
B) Optical microscopy
Estimation of (Ms) and (Bs)
Isothermally treated samples
Continuously cooled samples
tensile test results
tensile test results
The results show the following conclusions:
treated samples; within the limit of the present treatment conditions, the volume fraction of bainite phase was not observed to change.
cooled samples; minimum cooling time of 8 mins with (2º/S) cooling rate is a necessary condition to start bainitic transformation.
rates resulted in an almost constant volume fraction of bainite phase. However,Different bainite morphology is obtained during continuous cooling treatment even at constant cooling rate
also different cooling rates samples did not show similar
mainly in the slow cooling rate condition.
Lowering the cooling rate leads to a significant drop in the
ultimate tensile strength
with continuous stress-strain curve.
Further lowering the cooling rate, leads to a
stress-strain curve .