| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for predicting a lifetime of a metal mold having a base material as a molding alloy industrial tool steel, to which a nitriding process is applied. SOLUTION: The method for predicting the lifetime of the metal mold evaluates degradation on the surface of the metal mold from a differenceδ2θ, between diffraction angles obtained fromαphases at a surface region, to which the nitriding process is applied and a surface region to which the nitriding process is not applied, and determines the need for replacing the metal mold. Alternatively, the method for predicting the lifetime of the metal mold evaluates the metal mold from a difference between half widthsδW and replaces the metal mold. Additionally, the method for predicting the lifetime of the metal mold for evaluating the alloy industrial tool steel from a lattice constant of residual austenite and determines the necessity for replacing the metal mold. COPYRIGHT: (C)2006,JPO&NCIPI
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