Method for separating and visualizing austenite phase, martensite phase and bainite-ferrite matrix in bainitic steel and bainite steel piece for texture observation

摘要

To provide a method for separating and visualizing an austenite phase, a martensite phase and a bainite-ferrite matrix in bainitic steel, capable of discriminating austenite phase and martensite phase in bainitic steel on a nanoscale.The method of the present invention comprises: a) electropolishing a surface of a bainitic steel piece in an electrolyte solution containing a corrosive acid and an organic solvent to form a native oxide layer on the surface of the bainitic steel piece B) after completion of said electropolishing, said bainitic steel pieces are subsequently immersed in said electrolyte solution to form, on the region covering the martensite phase and the austenite phase of said native oxide layer, 1 and a second corrosion product layer, c) subjecting the surface of said bainitic steel piece to a scanning electron microscopic observation with a backscattering electron detector to measure said first and second corrosion By obtaining the contrast between the product layer and the remaining surface, the austenite phase is the darkest region, the bainite-ferrite matrix is the brightest region, and the martensite phase is It includes a step of visualizing, as the brightness of the region between the c) step is performed the incident energy of the primary electrons as follows 3 keV.BACKGROUND OF THE INVENTION