Fatigue Strength Restoration and Frictional Behavior Improvement of Cladding

A mesh of gear which is locally worn out by pitting, scoring, etc. could be restored its original shape by additive manufacturing process such as cladding with similar materials and proper machining process, but it’s original fatigue and wear characteristics cannot be obtained. The UNSM (Ultrasonic Nanocrystal surface modification) has been applied to restore its original rolling contact strength and to improve the wear resistance and friction characteristics. Friction and wear test specimens and rolling contact test specimens made of cladding are prepared and treated by UNSM technology. Ball-on-disc and ball rolling contact fatigue (RCF) tests in progress in order to show how much percent of rolling contact strength could be restored and friction and wear resistance could be improved. Microstructural and mechanical analysis will be added to explain their behavior.