OS1008 Suppression of Fatigue Crack Growth in Hydrogen-Charged SCM435 by Cavitation Peening

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  • OS1008 水素チャージしたSCM435材のキャビテーションピーニングによる亀裂進展の抑止

Abstract

In order to investigate suppression of fatigue crack growth in hydrogen-charged chrome molybdenum steel SCM 435 by cavitation peening employing a cavitating jet in water, a load controlled plate bending fatigue tests were conducted with load stress of 400 MPa after cathodic hydrogen charging with and without cavitation peening. The obtained results show crack growth rate were significantly accelerated by hydrogen charging. Number of cycle to failure from crack initiation of hydrogen-charged specimen increase 2.66 times by cavitation peening compared to an untreated one. It might be due to introducing compressive residual stress by cavitation peening.

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