FATIGUE STRENGTH OF ELECTROLYTICALLY BORATED STEEL IN RELATION TO THE CHARACTER OF DISTRIBUTION OF INTERNAL STRESSES,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Electrolytic coating of steel with boron, which is accompanied by the formation of high-hardness borides in the surface layer of steel, is employed to enhance the wear resistance of machine parts performing under conditions of abrasive wear. Since such machine parts often are exposed to cyclic loads, it was of interest to elucidate the effect of electrolytic boronizing on the fatigue strength of steels. Accordingly, the results of fatigue tests of electrolytically boronized specimens of 38KhS steel are presented. The decrease in fatigue strength after boronizing is due to the boronizing-induced compressive stresses in the boronized layer these are balanced by high tensile stresses which are chiefly located in an extremely thin layer directly underneath the boronized layer.
- Metallurgy and Metallography