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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.10
- 수록면
- 2,305 - 2,317 (13page)
- DOI
- 10.1007/s12540-021-01136-x
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The β-NiAl phase, which may exacerbate the high-temperature mechanical properties of Ni-based superalloy, was observedin a designed Re-containing single crystal superalloy. The solidification mechanism of β-NiAl phase and its evolutionafter solution treatment as well as long-term aging at 1120 °C were systematically investigated. The β-NiAl phase wasconfirmed by the analyses of XRD and TEM in as-cast specimen. Combined the analyses of TEM, DSC, phase diagramsand chemical segregation behaviors obtained via EPMA, the solidification path in interdendritic region was determined asL → (β-NiAl + Cr) eutectic, L → β + δ, L + β → γ′, L → γ′. The β-NiAl phase could be diminished by solution treatment and/or long-term aging treatment. After the solution treatment at 1330 °C for 30 min, the β-NiAl phase split into small bulks andthe δ phase dissolved, contributing to the formation of the γ + γ′ structure and large blocky δ phase. During the long-termaging at the 1120 °C, the β-NiAl phase transformed into γ and γ′ phase. With aging time prolonging, the Cr-rich phase dissolved,which promoted the precipitation of TCP confirmed as μ phase with three morphologies.
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