Method of predicting remaining lifetime of metal material

摘要

Disclosed is a method of predicting the remaining lifetime of a metal material, wherein the shapes of grains of the metal material are quantitatively measured to obtain variations in the shapes of the grains, and the remaining lifetime of the metal material is predicted on the basis of the variations. In accordance with the present invention, it is possible to statistically arrange the variations in the shapes of the grains by measuring such variations sequentially in time.