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AssigneeNippon Steel Corporation
InventorsTomonori Tominaga, Kazumi Matsuoka, Tadashi Ishikawa, Tadashi Kasuya, Koji Homma
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A novel treatment method, for improving fatigue life, is provided that aims to resolve problems associated with conventional treatment methods for improving fatigue life of metal by reduction of stress concentration and conventional treatment methods for improving fatigue life of metal by introduction of compressive stress, that is, problems of poor efficiency in work execution, required level of skill of workers, and the impossibility of quality control due to lack of means for measuring the effect after treatment, characterized in that, for locations in metal for which fatigue is a problem, after pre-treatment is performed, ultrasonic impact treatment is performed, and thereafter, a quality assurance test is performed so as to improve the fatigue life of the metal.
A treatment method for improving fatigue life, characterized in that, for the portion of metal material for which fatigue may become a problem, after pre-treatment is performed, ultrasonic impact treatment is performed, and thereafter quality assurance test is performed, to thereby improve fatigue life of the metal material.
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