Study on Fretting Dry Friction and Wear Properties of Spray-formed High Alloy Tool Steel

The fretting dry friction and wear tests of spray formed(SF) and electro-slag remelting(ESR) high alloy tool steels against silicon nitride(Si3 N4) ceramic ball were carried on SRV IV fretting friction and wear tester. The wear scar surface morphology was observed by SEM and the wear mechanism was analyzed. The results show that the wear resistance of spray-formed material improves by 47% compared with electro-slag remelting material. The friction coefficient first increases and then decreases with the increase of velocity under the load of 100 N. The wear mass loss of the material increases with increasing load and friction velocity. The wear mechanism of spray-formed material is abrasive wear at lower load, and then the wear becomes seriously with increasing the load and the wear mechanism changes into abrasive wear and adhesive wear. The wear mechanism transforms into serious oxidation fatigue and abrasive wear at heavier load.