Influence of rhenium and cooling rate on the solidification of Ni base superalloys, inconel 718

Nader El-Bagoury; Kaoru Yamamoto; Hirofumi Miyahara; Keisaku Ogi

doi:10.2320/matertrans.46.909

Influence of rhenium and cooling rate on the solidification of Ni base superalloys, inconel 718

Nader El-Bagoury, Kaoru Yamamoto, Hirofumi Miyahara, Keisaku Ogi

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Influence of 2-6% Re additions has been investigated on the solidification phenomenon of a Ni base superalloy, In718. The solidification of each alloy proceeds in the order of primary γ, eutectic (γ+NbC) and eutectic (γ+Ni₂Nb). Higher additions of Re increase the volume fraction of primary γ and enlarge the secondary dendrite arm spacing. The influence of cooling rates at 1, 10 and 100K/min has also been studied on the solidification process of the alloy containing 3.5% Re. With increasing cooling rate, the crystallization start temperatures of primary γ and eutectic phases decrease and the volume fraction of NbC and Ni₂Nb increase. EPMA analysis revealed that the distribution of alloy elements in microstructure also changed depending on cooling rate. The redistribution of alloy elements during solidification was evaluated by Clyne-Kurz and Ohnaka theories.

Original language	English
Pages (from-to)	909-915
Number of pages	7
Journal	Materials Transactions
Volume	46
Issue number	5
DOIs	https://doi.org/10.2320/matertrans.46.909
Publication status	Published - May 2005

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.2320/matertrans.46.909

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abstract = "Influence of 2-6% Re additions has been investigated on the solidification phenomenon of a Ni base superalloy, In718. The solidification of each alloy proceeds in the order of primary γ, eutectic (γ+NbC) and eutectic (γ+Ni2Nb). Higher additions of Re increase the volume fraction of primary γ and enlarge the secondary dendrite arm spacing. The influence of cooling rates at 1, 10 and 100K/min has also been studied on the solidification process of the alloy containing 3.5% Re. With increasing cooling rate, the crystallization start temperatures of primary γ and eutectic phases decrease and the volume fraction of NbC and Ni2Nb increase. EPMA analysis revealed that the distribution of alloy elements in microstructure also changed depending on cooling rate. The redistribution of alloy elements during solidification was evaluated by Clyne-Kurz and Ohnaka theories.",

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AU - Ogi, Keisaku

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Influence of rhenium and cooling rate on the solidification of Ni base superalloys, inconel 718

Abstract

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