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article
Structure and properties of composite layers of nitrided layers with surface zone of manganese phosphate type produced on 32CDV13 steel
Abstract
Due to its high mechanical properties the 32CDV13 steel is widely used in the industry for the production of highly loaded parts of machines and equipment. The increase in the durability and the reliability of elements is currently being achieved by using conventional methods of surface treatments: carburizing processes, burnishing and surface hardening. Hybrid processes constitute an alternative to these solutions, leading to obtaining of composite layers. They combine two or more techniques during surface treatments, enabling the formation of surface layers with unique and complementary properties. This paper presents the structure (light microscopy, SEM) and the results of friction wear resistance (“ball on disc” method) of composite layers produced on heat treated 32CDV13 steel after it was (hardness 36 HRC) subjected to the hybrid process which combined the glow discharge nitriding process and phosphating method. The results show improvement of tribological properties, especially reduction of friction coefficient in comparison to nitrided layer.