Improved fatigue crack propagation performance of Q355B steel with cold-sprayed A5052 and Al coatings

Abstract

Abstract Cold spraying has been widely used in engineering to improve the performance of metal materials by depositing particles and forming metallic coatings on the surface of the substrate. The fatigue performance of Q355B steel under cyclic stress was improved by depositing cold-sprayed coatings on its surface. The bonding strength of a steel substrate cold-sprayed with A5052 Al alloy was higher than that of a substrate sprayed with a pure Al coating. Three-point bending tests under the same load cycle showed that the fatigue crack length and propagation rate were reduced by both the coatings, thus prolonging the fatigue lifetime of the substrate. These results, combined with those of post-testing scanning electron microscopy analysis, showed that A5052 Al alloy coating is more effective than pure Al coating for improving the fatigue cracking performance of Q355B steel.