INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON

Abstract

Abstract: The influence of laser surface melting and induction hardening on the surface structure,con- tact fatigue life and failure behaviour of the nodular cast iron has been investigated.The con- tact fatigue life can be improved by both laser treatment and induction hardening,but the fail- ure process and type are different from each other.The former is due to lumpy and deep spal- ling caused by crack propagation between the quenching zone and the substrate,and the latter is due to nubby and surface flaking caused by the oil wedged action into surface cracks.

Key words: surface hardening, contact fatigue life, laser melting, induction hardening

TAO Zengyi LUO Jiaming Huazhong University of Science and Technology,Wuhan,China TAO Zengyi,Faculty of Metallic Materials,Dept.of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan 430074,China. INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(3): 188-193.

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INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON

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