铸钢表面电火花沉积层摩擦磨损性能

发布时间：2018-05-25 10:25

本文选题：电火花沉积 + WC-Co硬质合金　；参考：《材料热处理学报》2015年01期

【摘要】：采用新型电火花沉积设备,把WC-4Co陶瓷硬质合金材料沉积在铸钢材料上,制备了电火花沉积合金涂层,用SEM、XRD等技术研究了沉积层的物相、微观组织结构、元素分布、显微硬度及室温高温耐磨性能及磨损机理。结果表明:沉积层主要由Fe3W3C、Co3W3C和Fe2C等相组成;沉积层与基体呈冶金结合,过渡层出现一些柱状晶和树枝状晶组织结构,沉积层中细小的Fe3W3C和Co3W3C等硬质相颗粒弥散分布于Fe2C基体上。沉积层的平均显微硬度为1803.2 HV;室温下沉积层的耐磨性和300℃高温条件下沉积的耐磨性分别比同样条件下铸钢材料的磨损性能提高了2.5倍和3.4倍;不论室温还是300℃高温条件下沉积层的磨损机理主要是粘着磨损、疲劳磨损、氧化磨损和磨粒磨损的综合作用,细小的弥散分布的硬质相是沉积层硬度及耐磨性提高的主要因素。
[Abstract]:A new type of electrospark deposition equipment was used to deposit the WC-4Co ceramic cemented carbide material on the cast steel material. The electrospark deposition alloy coating was prepared. The phase, microstructure, element distribution, microhardness, wear resistance and wear mechanism at room temperature, temperature and temperature were studied by SEM and XRD. The results showed that the deposition layer was mainly from Fe3W3. The composition of C, Co3W3C and Fe2C, the deposition layer is metallurgical bonding with the matrix, and some columnar and dendritic structure structure appears in the transition layer. The fine particles of Fe3W3C and Co3W3C in the deposition layer are dispersed on the Fe2C matrix. The average microhardness of the sedimentary layer is 1803.2 HV; the wear resistance of the deposition layer at room temperature and the high temperature condition at 300 C The wear resistance of the deposited steel is 2.5 times and 3.4 times higher than that of the cast steel under the same condition. The wear mechanism of the deposited layer at room temperature or at 300 C is mainly the combination of adhesion wear, fatigue wear, oxidation wear and abrasive wear. The hard phase of the fine dispersion distribution is the hardness and wear resistance of the deposition layer. The main factor in the improvement of sex.
【作者单位】：华北水利水电大学机械学院;
【基金】：水利部948推广项目(201048)
【分类号】：TG174.4

【共引文献】