NONDESTRUCTIVE HARDNESS EVALUATION METHOD, NONDESTRUCTIVE HARDNESS EVALUATING APPARATUS AND HARDNESS-MEASURING DEVICE USED FOR NONDESTRUCTIVE HARDNESS EVALUATION

摘要

PPROBLEM TO BE SOLVED: To provide a method capable of nondestructively evaluating the hardness state of the surface layer of an object, using X-ray diffraction. PSOLUTION: A master component is subjected to X-ray diffraction analysis, and diffraction line widths based on diffracted X-rays are measured, thereby a database which prescribes the relation among the diffraction line widths and the hardness of the surface with respect to a master component is obtained, and a master curve which prescribes the relation between the hardness and the depth of a hardened layer. Next, a mass-produced hardened component which is a test body, is subjected to X-ray diffraction analysis similar to before, and diffraction line widths are acquired; and the hardness and the hardened layer depth of the surface layer of the test substance are estimated, by using the database, the master curve and the diffraction line widths related to the test substance; and then the hardness state of the surface layer of the mass-produced hardened components are evaluated, based on the estimated value. PCOPYRIGHT: (C)2008,JPO&INPIT