Jun Wang, Bo He, Caiyan Liu, Liang Lan, Shuang Gao, Yonghua Rong
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引用次数: 0
摘要
本研究的重点是等离子氮化（PN）工艺对 Ti-6Al-4 V（Ti64）钛合金表面纳米晶热稳定性的影响，该钛合金由选择性激光熔化（SLM）打印而成，随后经激光冲击强化（LSP）处理。通过 X 射线衍射、差示扫描量热仪、扫描电子显微镜和透射电子显微镜观察了 SLM-Ti64 钛合金在不同退火温度下依次经 LSP 和 PN 处理后的微观结构演变。结果表明，经 LSP 处理的 SLM-Ti64 合金的平均尺寸为 49.7 nm，即使在 600 °C 下纳米晶体仍能保持热稳定性，这归因于高密度位错对晶界迁移的强烈阻碍作用。显微结构表征表明，600 ℃ 时氮化层主要由 PN 纳米结构 TiN 相组成，与未氮化相比，纳米晶体的热稳定性进一步提高到 700 ℃，这归因于分散的纳米级 TiN 沉淀通过齐纳针销效应阻碍了晶界迁移。我们的工作提供了一种通过 PN 防止 Ti64 合金中纳米晶粗化的方法。
Thermal Stability of Nanocrystals in SLM-printed Ti64 Alloy Treated by Laser Shock Peening and Plasma Nitriding
This study focuses on the effect of a plasma nitriding (PN) process on the thermal stability of nanocrystalline on the surface of Ti-6Al-4 V (Ti64) titanium alloy, which is printed by selective laser melting (SLM) and subsequently treated by laser shock peening (LSP). The microstructure evolution of SLM-Ti64 titanium alloy treated sequentially by LSP and PN at different annealing temperatures was observed by X-ray diffraction, differential scanning calorimeter, scanning electron microscope, and transmission electron microscope. The results show that the average size of SLM-Ti64 alloy treated by LSP is 49.7 nm, even at 600 °C nanocrystals maintain thermal stability, which is attributed to the strong hinder effect of high-density dislocations on grain boundary migration. The microstructural characterization indicates that the nitrided layer is mainly composed of nanostructured TiN phase by PN at 600 °C, and the thermal stability of nanocrystals was further increased to 700 °C compared without nitriding, which is attributed to dispersed nanoscale TiN precipitates hindering the migration of grain boundaries by Zener pinning effect. Our work provides a method of preventing nanocrystalline coarsening in Ti64 alloy by PN.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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