Cr12钢电火花沉积超细涂层的摩擦磨损性能

Wear Properties of Ultra-fine Coating on Surface of Cr12 Steel Use Electro-spark Deposition

采用电火花沉积技术,在Cr12模具钢表面沉积了WC-12Co超细硬质合金涂层;并考察了涂层的显微组织及摩擦磨损性能。结果表明:沉积层组织均匀,与基体呈冶金结合,超细的硬质相弥散分布于沉积层中,其中部分区域硬质相达到了纳米颗粒尺寸。沉积层的平均显微硬度为1474.8HV0.1,约是基体硬度的3倍,沉积层的耐磨性能是基体的3.3倍。沉积层的磨损机制主要是磨粒磨损和疲劳磨损。弥散分布的细小硬质相是沉积层硬度及耐磨性能提高的主要因素。

The surface of Cr12 substrate is strengthened with the electrode of WC-12Co cemented alloy using the electro-spark deposition（ESD）technique.The microstructures and wear properties of the coating were investigated.The results show that the coating is homogeneous and metallurgically bonded with the substrate.The nanosized particles dispersedly distribute in the coating.The average hardness of the coating is about 3 times of the substrate,and its wear resistance is 3.3 times of the substrate.The wear mechanism includes abrasive and fatigue wear.Superfine hard phases which distribute dispersedly in coating are the main factors leading to high hardness and wear resistance of the coating.