碳化钒含量对Fe_(50)Mn_(30)Cr_(10)Co_(10)高熵合金涂层蠕变性能的影响

Effect of Different VC Content on the Creep Properties of Fe_(50)Mn_(30)Cr_(10)Co_(10) High-Entropy Alloy Coating

制备各类涂层对材料表面进行强化处理是提高材料服役性能的重要途径,而通过添加不同含量硬质相有利于进一步改善涂层性能。通过选区激光熔覆工艺制备添加不同VC(碳化钒)含量的Fe_(50)Mn_(30)Cr_(10)Co_(10)高熵合金涂层材料,采用扫描电镜、X射线衍射仪、纳米压痕仪等研究VC含量对涂层显微组织、相结构、硬度和蠕变性能的影响。结果表明,随着VC含量的增加,涂层组织明显细化;因VC原子固溶在FCC(面心立方)晶格中,对涂层相结构不产生影响;因增大了固溶强化效应,故增加了涂层的硬度。特别是,随着VC含量的增加,涂层的蠕变量减小,这十分有利于改善涂层材料的蠕变性能。这为通过添加VC硬质相强化高熵合金涂层性能提供了重要的依据。

Preparing various types of coatings to strengthen the surface of materials is a significant technique to increase the materials' service performance, and the addition of different content of hard phase is conducive to further improve the properties of coatings. The Fe_(50)Mn_(30)Cr_(10)Co_(10) high-entropy alloy coating with different VC content were prepared through selective laser cladding process, and the effects of VC content on the microstructure, the phase structure, the hardness and the creep properties of the coatings were researched by scanning electron microscope, X-ray diffractometer, nano indentation instrument, etc. Results showed that the coating structure was obviously refined with the increase of VC content. There was no effect on the phase structure of the coating, because of VC being dissolved in FCC lattice. The hardness of the coating increased, owing to the increase of solid solution strengthening effect. Particularly, with the increase of VC content, the creep value of the coating decreased, which was very beneficial to improve the creep performance of the coating material. This provided an important basis for strengthening the properties of the coating of high-entropy alloy by adding VC hard phase.