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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Correlation of Microstructure and Abrasive and Sliding Wear Resistance of (TiC,SiC)/Ti-6Al-4V Surface Composites Fabricated by High-Energy Electron-Beam Irradiation
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Correlation of Microstructure and Abrasive and Sliding Wear Resistance of (TiC,SiC)/Ti-6Al-4V Surface Composites Fabricated by High-Energy Electron-Beam Irradiation

机译：高能电子束辐照制备的（TiC，SiC）/ Ti-6Al-4V表面复合材料的组织与耐磨性和滑动耐磨性的相关性

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摘要

This study is concerned with the correlation of microstructure and abrasive and sliding wear resistance of (TiC,SiC)/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation. The mixtures of TiC, SiC, Ti + SiC, or TiC + SiC powders and CaF_2 flux were deposited on a Ti-6Al-4V substrate, and then an electron beam was irradiated on these mixtures. The surface composite layers of 1.2 to 2.1 mm in thickness were homogeneously formed without defects and contained a large amount (30 to 66 vol pct) of hard precipitates such as TiC and Ti_5Si_3 in the martensitic matrix. This microstructural modification, including the formation of hard precipitates in the surface composite layer, improved the hardness and abrasive wear resistance. Particularly in the surface composite fabricated with TiC + SiC powders, the abrasive wear resistance was greatly enhanced to a level 25 times higher than that of the Ti alloy substrate because of the precipitation of 66 vol pct of TiC and Ti_5Si_3 in the hardened martensitic matrix. During the sliding wear process, hard and coarse TiC and Ti_5Si_3 precipitates fell off from the matrix, and their wear debris worked as abrasive particles, thereby reducing the sliding wear resistance. On the other hand, needle-shaped Ti_5Si_3 particles, which did not play a significant role in enhancing abrasive wear resistance, lowered the friction coefficient and, accordingly, decelerated the sliding wear, because they played more of the role of solid lubricants than as abrasive particles after they fell off from the matrix. These findings indicated that high-energy electron-beam irradiation was useful for the development of Ti-based surface composites with improved abrasive and sliding wear resistance, although the abrasive and sliding-wear data should be interpreted by different wear mechanisms.
机译：本研究涉及高能电子束辐照制备的（TiC，SiC）/ Ti-6Al-4V表面复合材料的微观结构与耐磨性和滑动耐磨性的相关性。将TiC，SiC，Ti + SiC或TiC + SiC粉末的混合物和CaF_2焊剂沉积在Ti-6Al-4V基板上，然后在这些混合物上照射电子束。均匀地形成厚度为1.2至2.1mm的表面复合层而没有缺陷，并且在马氏体基体中包含大量（30至66vol pct）的硬质沉淀物，例如TiC和Ti_5Si_3。这种微观结构的改变，包括在表面复合层中形成硬质沉淀物，提高了硬度和耐磨性。特别是在用TiC + SiC粉末制成的表面复合材料中，由于在硬化的马氏体基体中析出了66 vol％的TiC和Ti_5Si_3，因此耐磨性大大提高到了Ti合金基材的25倍。在滑动磨损过程中，硬而粗的TiC和Ti_5Si_3沉淀物从基体上脱落，它们的磨损碎屑充当磨料颗粒，从而降低了滑动耐磨性。另一方面，针状的Ti_5Si_3颗粒在提高耐磨性方面没有起到重要作用，但降低了摩擦系数并因此降低了滑动磨损，因为它们比起磨蚀性起着更多的固体润滑剂作用从基体上脱落下来的颗粒。这些发现表明，高能电子束辐照可用于开发具有改善的耐磨性和滑动耐磨性的Ti基表面复合材料，尽管应通过不同的磨损机理来解释磨料和滑动磨损数据。

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