Abstract
• Nitriding treatment leads to a reduction in the volume of wear and the specific wear coefficient. • Nano nitrides phases formed on the surface of the material. • Microstructural parameters and the number of phases influence the micro-abrasive wear behavior. • The hard layer of nitrides increased the AISI 4140 steel hardness more than 2.5 twice. Plasma nitriding was performed on AISI 4140 steel for various times. Untreated and plasma nitrided AISI 4140 steel were microstructurally, mechanically and tribologically characterized. The nitrided compound layer, consisting of ε-Fe 2-3 N and λ-Fe 4 N phases, was approximately of 5.0 μm thick. Microhardness of treated steel for 3 h was significantly higher than that of the untreated. The ball cratering test revealed that abrasivity of the treated samples decreased with the nitriding time due to an increasing in micro-strain values, quantify of nitrided phases, and the formation of nanocrystalline size of nitrides.
Published Version
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