Surface Durability of Ion-Nitrided Rollers

Abstract

This paper presents a study on the surface durability of ion-nitrided rollers. The durability of S45C ion-nitrided rollers with different case depths was investigated by carrying out running tests. The results were compared with the results for normalized and tufftrided rollers. The contact fatigue strength of ion-nitrided and tufftrided rollers tend to increase with an increase of case depth. The contact fatigue strength of the ion-nitrided roller was found to be much larger than that of the normalized roller and to become larger than that of the tufftrided roller with an increase of case depth. The surface failure mode in this experiment for ion-nitrided and normalized rollers was pitting due to the surface cracking but that of tufftrided rollers was spalling due to the subsurface cracking. © 2001, The Japan Society of Mechanical Engineers. All rights reserved.