METHOD FOR DETECTING SOLIDIFICATION STRUCTURE OF STEEL

摘要

PROBLEM TO BE SOLVED: To provide a method for detecting solidification structure of a type of steel which has relatively low differences in concentrations of solute elements due to segregation during solidification, particularly of a low-carbon steel which has a carbon concentration of 0.01 mass% or less.

SOLUTION: After a cross section of a sample of steel cast slab is polished, the cross section of the sample is corroded to cause solidification structure of the steel to appear while applying supersonic waves of 30 kHz to 3 MHz to a corrosive liquid 15 in which microbubble-containing water is used as a solvent to subject the corrosive liquid 15 to water resonance. The sample is then washed and dried, and corroded holes formed in the cross section of the sample are filled with polishing powder. After transparent adhesive tape is stuck on the cross section of the sample to adhere the polishing powder in the corroded holes to the transparent adhesive tape, the transparent adhesive tape is removed and then stuck on a white mount.

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