Abstract
By using optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), electron back scattered diffraction (EBSD) and tensile test, the effect of annealing temperature on microstructure and mechanical properties of a high Al-low Si TRIP steel was investigated. The results show that TRIP effect can be obtained when annealing temperature is above A c 3 due to the existence of δ-ferrite in this high Al-low Si TRIP steel. That is to say, the microstructure consisting of ferrite, bainite and retained austenite can be obtained when annealing temperature is above A c 3 . Furthermore, the tensile strength and the product of strength and elongation decrease with increasing annealing temperature when annealing temperature is above A c 3 .
Highlights
Reduction in the weight of automobile bodies has been continuously needed in order to improve the fuel efficiency and to reduce the amount of emission gas for better environmental preservation [1]
The tensile strength and the product of strength and elongation decrease with increasing annealing temperature when annealing temperature is above Ac3
Due to the existence of -ferrite in high aluminum transformation induced plasticity (TRIP) steel, ferrite can be obtained when annealing temperature is above Ac3
Summary
Reduction in the weight of automobile bodies has been continuously needed in order to improve the fuel efficiency and to reduce the amount of emission gas for better environmental preservation [1] This led to huge demands for high strength steels with excellent formability. Enhanced formability and energy absorption behavior can be attributed to the TRIP effect, which is the transformation of the retained austenite phase in the microstructure to martensite upon straining [3].
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