INFLUENCE OF RECOATING ON THE MECHANICAL AND TRIBOLOGICAL PERFORMANCEOF TIN-COATED HSS

In the manufacturing industry, there is a pronounced economic interest in the recoating of used tools. The influence of recoating on the mec hanical (composite hardness, scratch test response and residual stress ) and tribological (intrinsic abrasive wear resistance) properties of TiN-coated high speed steel has been studied for two different deposit ion techniques. The overall mechanical and tribological performance of recoated specimens was found to be as good as single-coated TiN. For are-evaporated coatings, the residual stress was found to decrease wit h increasing number of recoatings, whereas no influence was found for ion-plated coatings. In both cases, the coating abrasive wear resistan ce was found to increase with decreasing coating residual stress.