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Microstructure and properties of gradient nitrided layer on Ti6Al4V alloys

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Abstract

The vacuum electromagnetic induction nitriding technology was applied to prepare a gradient nitrided layer on the surface of a Ti6Al4V alloy, which possesses TiN and α-Ti (N) phases. Moreover, transmission electron microscopy was conducted to confirm the presence of numerous high-density stacking faults caused by TiN and Ti2N phases distributed on the surface of the alloy, along with a large number of basal stacking faults inside. A high-density stacking fault led to serious distortion of lattice fringes. Lattice and numerous edge dislocations caused by defects were observed in the subsurface layer. For the surface layer, the Vickers hardness reached HV0.25 1211.30 and the residual compressive stress increased, while the nano-hardness increased to 14.07 from 5.31 GPa in the substrate. The micrometre scratch test results indicated that the plasticity and hardness of the nitrided layer changed in a gradient. The 50-μm effective hardened layer depth and surface compressive stress of the Ti6Al4V alloy were enhanced by the stacking faults.

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摘要

采用真空电磁感应渗氮技术(VEINT), 在Ti6Al4V 合金表面制备具有梯度结构的氮化层, 该渗氮层由TiN 相和α-Ti(N)相组成, TEM 观测到表层分布有大量由TiN 和Ti2N 相所引起高密度层错, 其内部可看见大量的基面层错, 高密度的层错引起晶格条纹发生严重的扭曲；次表层观察到缺陷造成的晶格错排和大量的刃位错。表层维氏硬度达到HV0.25 1211.30, 且表面残余压应力增大, 纳米硬度从基体5.31 GPa 呈渐增至表层14.07 GPa, 微米划痕测试发现氮化层塑性和硬度呈梯度变化, 有效硬化层深度约为50 μm, 层错能提高了Ti6Al4V 合金表面压应力。

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Acknowledgements

This study was financially supported by the Science and Technology Foundation of Guizhou Province (No. [2020]1Z041).

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    Authors and Affiliations

    1. College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials, Xiamen University, Xiamen, 361005, China

      Feng Yang, Xing-Jun Liu & Cui-Ping Wang

    2. School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang, 550001, China

      Feng Yang & Kun-Mao Li

    3. Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan

      Hong Sun

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    Yang, F., Li, KM., Liu, XJ. et al. Microstructure and properties of gradient nitrided layer on Ti6Al4V alloys. Rare Met. 42, 651–663 (2023). https://doi.org/10.1007/s12598-022-02122-x

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