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논문 기본 정보

자료유형
학술저널
저자정보
Yingbo Bai (Chinese Academy of Sciences) Rui Zhang (Chinese Academy of Sciences) Chuanyong Cui (Chinese Academy of Sciences) Yizhou Zhou (Chinese Academy of Sciences) Xiaofeng Sun (Chinese Academy of Sciences)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.2
발행연도
2024.2
수록면
333 - 347 (15page)
DOI
10.1007/s12540-023-01510-x

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초록· 키워드

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This study investigates the thermal stability of a GH4065A superalloy at intermediate temperatures by conducting long-termaging treatments for 100–6000 h at 700–800 °C. Secondary γ′-phase coarsening and intergranular M6Ccarbide precipitationoccurred during aging. The activation energy for secondary γ′-phase coarsening was 259.89 ± 25.45 kJ mol−1, suggestingthat this process was predominantly controlled by elemental diffusion. The tensile strength at a testing temperature of 700 °Cwas stably above 1200 MPa for the alloys aged at 700 °C but continuously declined as the aging temperature increased, witha direct correlation identified between the secondary γ′-phase coarsening and strength reduction upon aging. Increasing theaging temperature transitioned the deformation mechanism from Orowan bowing around the γ′ phase to dislocation slipthrough the broadened matrix channels, leading to decreased strength. Long-term aging effectively eliminated intermediatetemperatureintergranular brittle fracture. The elongation to failure at a testing temperature of 700 °C increased by approximately35% after aging at 800 °C for 6000 h, attributed to grain-boundary diffusion of W and Mo and intragranular softening,which improved the deformation coordination ability at the grain boundaries. Finally, the precipitation of intergranular M6Cparticles after prolonged aging promoted plastic deformation via micropore aggregation.

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