The formation of bainite was observed by using a hot stage microscope, directly and dynamicaly, and the mechanism of bainite formation was qualitatively studied. The results areas follows:-(1) During bainite transformation,surface relief effects were observed on polished specimens. It indicates that bainite is coherent with matrix austenite and so its mechanism of formation differs from that of pearlite. (2) The surface relief due to bainite transformation grows slowly and so the bainite transformation differs from martensite transformation. (3) The growth rate, the tilt (Hmax) and the shape of the surface relief due to bainite transformation change continuously as the temperature of transformation changes.
(4) From the experimental results, it is concluded that the bainitic transformation is another mode of transformation, distinguishable from pearlitic and martensitic tranformations.
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