The invention discloses a method for simultaneously displaying bearing steel
austenite grain boundary and transgranular
martensite, and belongs to the technical field of metallographic preparation. The method comprises the steps of firstly,
machining steel into block samples with the side length being 10 to 20 mm, raising the temperature of a
heating furnace to 1000 to 1100 DEG C, feeding the samples into the
heating furnace, keeping the temperature for 5 to 20 min, cooling the
heating furnace to 690 to 730 DEG C at the speed of 0.1 to 0.5 DEG C / s after heat preservation, and then performing
quenching treatment, secondly, performing rough
grinding, fine
grinding and
polishing treatment on the samples, and finally, preparing 2 to 4 percent
nitric acid alcohol solution at normal temperature, dipping polished surfaces of the samples into the
nitric acid alcohol solution for 10 to 20 s, washing the samples with water after surfaces of the samples becomes gray white, cleaning the water through
alcohol solution, and then
drying the surfaces of the samples through a blower. Clear network
carbide can be observed through a
microscope to be distributed in an initial
austenite grain boundary, and meanwhile,
martensite in the
austenite grain can also be clearly displayed. The method is simple in
corrosion process steps, easy to operate, high in stability and clear in eroded effect, and provides convenience for solving the relation between the size of the
austenite grain boundary and the transgranular
martensite.