Abstract
Sulphide layers were produced on 1045 steel substrates of five different states: as quenched, quenched and tempered at different temperature, and annealed, respectively, by low temperature ion sulphurization technology. The effect of substrate hardness on the microstructure and tribological properties of sulphide layer was studied by SEM equipped with EDX, XRD and a reciprocating wear tester. Increasing defect density of substrate could probably result in thicker layer, but the surface morphology, composition, and structure of sulphide layer were unchanged greatly. No transition layer was found between the sulphide layer and substrate. The sulphide layer showed an obviously friction-reducing effect. The friction coefficient of sulphide layer was independent of the substrate, but its endurance life could be extended on a harder substrate. The wear-resistance of sulphurized surface was improved because the sulphide layer could effectively protect it from adhesion and strain fatigue. However, the decomposition and regeneration of iron sulphide due to friction heat in the friction process could have a certain corrosive effect on the surface. The wear volume of sulphurized surface was increased on the contrary if the sulphide layer was thicker and its endurance life was longer.
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