METHOD FOR MEASURING INTERNAL RESIDUAL STRESS IN INDUCTION HARDENING MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring internal residual stress in an induction hardening member capable of precisely measuring not only surface residual stress but also internal residual stress therein using a simple method having no harmful effect on residual stress measurement.SOLUTION: A method for measuring internal residual stress in an induction hardening member includes: a procedure for cutting out a measurement piece 30 from a metal member 10 subjected to induction hardening by wire cut electron discharge processing; a procedure for electrolytically polishing the measurement section 32 of the measurement piece 30; and a procedure for obtaining a crystal lattice interval by X-ray diffraction while radiating an X-ray onto the measurement section 32 of the electrolytically polished measurement piece 30.SELECTED DRAWING: Figure 1