CARBON CONCENTRATION DISTRIBUTION MEASURING METHOD, AND MANUFACTURING METHOD OF CARBURIZED MEMBER USING IT

摘要

PROBLEM TO BE SOLVED: To provide a carbon concentration distribution measuring method capable of determining simply a carbon concentration distribution in a steel after carburization by nondestructive inspection, and a manufacturing method of a carburized member using it. SOLUTION: In the measuring method, a regression curve showing in a dimensionless way a relation between the depth from the surface of the steel after carburization and the carbon concentration at the depth is assumed, and a carbon concentration axial direction of the regression curve is multiplied by (Q-P) and P is added thereto, and the depth axial direction of the regression curve is multiplied by (B-A)/äρ×S×(Q-P)}, to thereby determine the carbon concentration distribution in the steel after carburization. In this case, Q is a surface carbon concentration (wt.%) in the steel after carburization; P is a surface carbon concentration (wt.%) in the steel before carburization; B is a steel weight (g) after carburization; A is a steel weight (g) before carburization;ρis a density (g/m3) of the steel; and S is a surface area (m2) of the steel. The manufacturing method has an inspection process for determining the depth from the surface at which a constant carbon concentration is acquired by using the measuring method, and performing nondestructive inspection of the carburized member. COPYRIGHT: (C)2008,JPO&INPIT