METHOD OF DETERMINING OCCURRENCE OF MOLTEN METAL EMBRITTLEMENT CRACK IN HOT-STAMPED MOLDING, AND HOT-STAMPED MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a method of determining easily the presence/absence of a molten metal embrittlement crack in a galvanized steel material for hot stamping.SOLUTION: A method of determining the occurrence of a molten metal embrittlement crack in a hot-stamped molding produced by hot stamping of a galvanized steel material includes a step of heating the galvanized steel material according to heating conditions for the hot-stamped molding, a step of hardening the galvanized steel material after the heating, a step of applying X-ray diffraction to the surface of the galvanized steel material after the hardening and a step of determining occurrence of a molten metal embrittlement crack on the basis of diffraction intensities of an Fe-Zn-based intermetallic compound, among diffraction intensities measured by X-ray diffraction.