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<p>The influence of V contents (0.6 wt%, 0.8 wt% and 1.0 wt%) on the microstructure and creep behavior of a Nickel-based superalloy was investigated. The results revealed that the V content exerted a significant impact on the morphology of carbide. Notably, in the alloy containing 0.8 wt% V, coarse blocky <i>M</i><sub>6</sub>C carbides formed adjacent to <i>M</i>C carbides, while in the 1.0 wt% V alloy, fine granular <i>M</i><sub>6</sub>C carbides exhibited a nearly continuous distribution along grain boundaries (GBs). The influence of V content on creep properties exhibited significant variations depending on temperature. At 650&#xa0;°C/1010&#xa0;MPa, the 1.0 wt% V alloy, containing a high density of granular <i>M</i><sub>6</sub>C carbides, demonstrated enhanced intergranular bonding strength, which contributed to prolonged creep life. In contrast, at higher temperatures (750&#xa0;°C/620&#xa0;MPa and 800&#xa0;°C/500&#xa0;MPa), GB mobility was activated, making GB slip the dominant creep mechanism. The near-continuous distribution of <i>M</i><sub>6</sub>C carbides in the 1.0 wt% V alloy restricted GB deformation compatibility, promoting stress localization and an increased density of micropores along GBs. As a result, the 0.8 wt% V alloy, with its discrete <i>M</i><sub>6</sub>C carbide distribution, exhibited superior creep resistance at elevated temperatures.</p>

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Effect of Vanadium Element on Creep Behavior and Microstructure Evolution of a High Strength Ni-Based Wrought Superalloy

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Yongchao Gai,
  • Rui Zhang,
  • Fuqiang Wang,
  • Zijian Zhou,
  • Xipeng Tao,
  • Shaomin Lyu,
  • Xingfei Xie,
  • Chuanyong Cui,
  • Jinglong Qu,
  • Tianyu Zhu

摘要

The influence of V contents (0.6 wt%, 0.8 wt% and 1.0 wt%) on the microstructure and creep behavior of a Nickel-based superalloy was investigated. The results revealed that the V content exerted a significant impact on the morphology of carbide. Notably, in the alloy containing 0.8 wt% V, coarse blocky M6C carbides formed adjacent to MC carbides, while in the 1.0 wt% V alloy, fine granular M6C carbides exhibited a nearly continuous distribution along grain boundaries (GBs). The influence of V content on creep properties exhibited significant variations depending on temperature. At 650 °C/1010 MPa, the 1.0 wt% V alloy, containing a high density of granular M6C carbides, demonstrated enhanced intergranular bonding strength, which contributed to prolonged creep life. In contrast, at higher temperatures (750 °C/620 MPa and 800 °C/500 MPa), GB mobility was activated, making GB slip the dominant creep mechanism. The near-continuous distribution of M6C carbides in the 1.0 wt% V alloy restricted GB deformation compatibility, promoting stress localization and an increased density of micropores along GBs. As a result, the 0.8 wt% V alloy, with its discrete M6C carbide distribution, exhibited superior creep resistance at elevated temperatures.