Effect of laser treatment on wear behavior of 4Cr3Mo2NiVNb steel

The characteristics(including width,depth,area ratio and volume) of non-smooth units processed on the surface of 4Cr3Mo2NiVNb steel using different parameters and the microstructure and hardness of the units were studied.And the wear-resistance of the material with non-smooth surface was measured.The results show that within the rated power the width,volume of the non-smooth unit increase with the increasing of current intensity and pulse duration at the same frequency,and the microstructure become coarser,the hardness decreases and the wear-resistance is improved.But there is little difference in the improving extent of wear-resistance of the materials with non-smouth surface when current intensity and pulse duration increase to 200A and 15ms,respectively.The wear-resistance of the steel with non-smooth surface processed with intensity 300A and duration 20ms is better in the experiment.The improving extent of wear-resistance is based on the combination of characteristics,microstructure and hardness of the non-smooth unit.