Analysis of phase transformations during continuous cooling by the first derivative of dilatation in low carbon steels

► The analysis of transformation behaviors during cooling by the first derivatives of dilatations. ► Elimination of experimental noise by Fast Fourier Transformation and Wavelet Transformation. ► Detection of a small fraction phase by the overlapping of the first derivatives of dilatations. ► Confirmation of the transformation of bainite and martensite by color tint etching technique.