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<p>Turbine blades, due to their intricate geometry, are exposed to multiaxial stresses during operation. Consequently, it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenarios, particularly under high-temperature conditions. Stress-rupture behavior of a Ni-based single crystal superalloy was investigated under a load varying from 100 MPa to 137 MPa at 1,100 °C for both [001]- and [111]-orientated specimens. Results demonstrate that the rupture behavior of [111]-orientated specimens exhibits obviously higher sensitive to applied stress compared to [001]-orientated specimens. This difference is primarily attributed to the orientation dependent γ′ coarsening behavior and distinct dislocation interactions at γ/γ′ interfaces. In [001]-oriented specimens, plate-like γ/γ′ rafts rapidly form alongside well-developed interfacial dislocation networks, where the γ/γ′ misfit stress dominates the microstructural evolution. In contrast, the [111]-orientated specimens exhibit retained, coarsened γ′ precipitates embedded within the γ matrix, accompanied by poorly developed interfacial dislocation networks.</p>

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Stress-rupture behavior of a Ni-based Re-containing single crystal superalloy in [001] and [111] orientations at 1100 °C

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Guang-lei Wang,
  • Dong-qing Qi,
  • Jin-lai Liu,
  • Ji-de Liu

摘要

Turbine blades, due to their intricate geometry, are exposed to multiaxial stresses during operation. Consequently, it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenarios, particularly under high-temperature conditions. Stress-rupture behavior of a Ni-based single crystal superalloy was investigated under a load varying from 100 MPa to 137 MPa at 1,100 °C for both [001]- and [111]-orientated specimens. Results demonstrate that the rupture behavior of [111]-orientated specimens exhibits obviously higher sensitive to applied stress compared to [001]-orientated specimens. This difference is primarily attributed to the orientation dependent γ′ coarsening behavior and distinct dislocation interactions at γ/γ′ interfaces. In [001]-oriented specimens, plate-like γ/γ′ rafts rapidly form alongside well-developed interfacial dislocation networks, where the γ/γ′ misfit stress dominates the microstructural evolution. In contrast, the [111]-orientated specimens exhibit retained, coarsened γ′ precipitates embedded within the γ matrix, accompanied by poorly developed interfacial dislocation networks.