IMPROVEMENT OF FATIGUE STRENGTH OF METALLIC MEMBER, AND METALLIC MEMBER IMPROVED IN FATIGUE STRENGTH

摘要

PROBLEM TO BE SOLVED: To provide a method for improving the fatigue strength of a metallic member, and also to provide a metallic member improved in fatigue strength. ;SOLUTION: A metallic material, causing volume expansion by transformation, is used, and this metallic material is thermally sprayed to laminate a thermally sprayed layer on the surface of a metallic member, and the volume expansion due to transformation is regulated so that it is greater than the contraction due to cooling of the thermally sprayed layer, by which a part where residual compressive stress is present is formed in the thermally sprayed layer. By this method, the fatigue strength of the metallic member can be improved. An Fe-C type metallic material, having 0.3 to 2.0 wt.% carbon content, can be used as the metallic material.;COPYRIGHT: (C)1998,JPO