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<p>A novel Sm-doped nickel-based superalloy, NVSm, has been heat-treated by solutioning and aging treatments. The samples were observed for changes in microstructure and hardness values. The solutioning is followed by cooling in two different routes, viz. furnace cooling and liquid metal cooling. The solutioned samples were later subjected to aging treatment at three different temperatures, followed by furnace cooling. After successive heat treatments, the heat-treated samples were studied for phase stability of the L1<sub>2</sub> (γ′, or Ni<sub>3</sub>Al) phase and hardness values. The samples aged in the LMC route showed optimum hardness and are considered for the secondary aging process at 850&#xa0;°C. The samples subjected to complete treatment are subjected to compression testing at different temperatures. The NVSm alloy has an anomalous increase in yield strength with increasing test temperature. The NVSm alloy, although not in its single crystal form, offers a maximum yield strength of around 1155&#xa0;MPa at a temperature of 750&#xa0;°C, a value comparable to that of alloys like DD407, which offers a maximum yield strength of 1000&#xa0;MPa at 827&#xa0;°C, in its single crystal form.</p>

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On Phase Stability and Strength Stability of Kinetically Heat-Treated Novel Sm-Doped Nickel-Based Superalloy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Giridhar Gudivada,
  • Ajoy Kumar Pandey

摘要

A novel Sm-doped nickel-based superalloy, NVSm, has been heat-treated by solutioning and aging treatments. The samples were observed for changes in microstructure and hardness values. The solutioning is followed by cooling in two different routes, viz. furnace cooling and liquid metal cooling. The solutioned samples were later subjected to aging treatment at three different temperatures, followed by furnace cooling. After successive heat treatments, the heat-treated samples were studied for phase stability of the L12 (γ′, or Ni3Al) phase and hardness values. The samples aged in the LMC route showed optimum hardness and are considered for the secondary aging process at 850 °C. The samples subjected to complete treatment are subjected to compression testing at different temperatures. The NVSm alloy has an anomalous increase in yield strength with increasing test temperature. The NVSm alloy, although not in its single crystal form, offers a maximum yield strength of around 1155 MPa at a temperature of 750 °C, a value comparable to that of alloys like DD407, which offers a maximum yield strength of 1000 MPa at 827 °C, in its single crystal form.