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The ion nitrocarburized layer was prepared on the surface of 42MnCr52 steel sample by using the ion nitrocarburizing process. The nitrocarbonide grains and holes all in smaller scale distribute equably. The nitrocarbonide surface layer is about 18 μm in thickness. The ion nitrocarburized layer is composed mainly of Fe3N that is the key composition of ε phase, which can insure the excellent hardness and toughness of the ion nitrocarburized layer. The bonding strength and stress analysis show that the nitrocarbonide surface layer and its diffusing layer of ion nitrocarburized layer all possess higher bonding strength, which may avoid the ion nitrocarburized layer to flake off during friction process. Introduction 42MnCr52 steel is often used to produce engine cylinder. Now the intermediate frequency quenched technology is used to prove the wear resistance and scuffing resistance of the cylinder wall, but the effect is not good. Ion nitrocarburizing is the technics that carries through adding the carbonaceous medium on the base of ion nitriding technics. N atom and C atom form the nitrocarbonide layer that the key phase is ε phase and possesses high hardness and excellent wear resistance and scuffing resistance, which may prove obviously the fatigue intensity and carrying capacity of the materials.[1-3] Ion nitrocarburizing technics is the same with treat with alloy steel, stainless steel, alloy cast iron and so on.[4-10] The paper studied the mechanics capability, mophology and structure of ion nitrocarburized layer of 42MnCr52 steel, which is propitious to study ulteriorly the tribological performance of ion nitrocarburized layer of 42MnCr52 steel.

Mechanics Capability and Structure of Ion Nitrocarburized Layer of 42MnCr52 Steel