Study on fretting wear and tribo-chemical behavior of LZ50 axle steel in torsional fretting fatigue

The torsional fretting fatigue tests of LZ50 axle steel were carried out in a cylinder-on-cylinder contact configuration to investigate the influence of fretting wear and tribo-chemical action in the contact zone on the fretting fatigue life. The S-N curves of the torsional fretting fatigue were drawn. The results indicated that there was a competitive relationship between wear and fatigue in the fretting process. The tribo-chemical action in the fretting damage zone accelerated the wear of material. The Fe element in fretting damage zone existed in consist of Fe0+, Fe2+ and Fe3+.