Effect of Precipitation of δ-Phase on the Strength of Grain Boundaries in Ni-Base Superalloy GH4169 at Elevated Temperatures

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  • NAKAYAMA Ayumi
    Department of Finemechanics, Graduate School of Engineering, Tohoku University
  • WANG Runzi
    School of Mechanical and Power Engineering, East China University of Science and Technology
  • SUZUKI Ken
    Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
  • MIURA Hideo
    Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University

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Other Title
  • Ni基超合金GH4169の高温粒界強度に及ぼすδ相析出の影響

Abstract

<p>In order to quantitatively clarify the effect of δ-phase precipitation on the strength of grain boundary in Ni-based superalloy GH4169 at elevated temperatures, which is expected to be used in aircraft engines, uniaxial tensile tests at 800°C were conducted on specimens with different amounts of δ-phase precipitation, and the microstructural changes were analyzed using laser microscopy and EBSD. The microstructural changes were analyzed by laser microscopy and EBSD. It was confirmed that the alloy with δ-phase precipitation (GH4169) fractured at 800°C with necking. EBSD analysis showed that the high-density dislocations occurred only in the region of a few μm near the grain boundary. Furthermore, the strength of the specimens with δ-phase precipitation was lower than that of the specimens without δ-phase precipitation, indicating that the δ-phase precipitation caused a decrease in the material strength. The amount of δ-phase precipitation increased with increasing heating time and the strength decreased accordingly, suggesting the possibility of using the amount of δ-phase precipitation near the grain boundary to evaluate the grain boundary strength.</p>

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