Directional Solidification of Ren&amp;eacute; 80

Nakagawa, Y. G.; Ohtomo, Akira; Saiga, Yoshinori

doi:10.2320/matertrans1960.17.323

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…5a,b,c . The creep rupture life of HESA at 982 °C is about 114 h, which is similar to those of several first-generation Ni-based superalloys under similar test conditions, e.g., the creep life of NX-188 DS under 982 °C/138 MPa test is 58 h 35 , and that of Rene′ 80 under 982 °C/145 MPa test is 118 h 36 . The 982 °C creep curve of HESA is clearly shown in Fig.…”

Section: Resultssupporting

confidence: 76%

The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Tsao

Yeh

Kuo

et al. 2017

Sci Rep

162

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This article presents the high temperature tensile and creep behaviors of a novel high entropy alloy (HEA). The microstructure of this HEA resembles that of advanced superalloys with a high entropy FCC matrix and L12 ordered precipitates, so it is also named as “high entropy superalloy (HESA)”. The tensile yield strengths of HESA surpass those of the reported HEAs from room temperature to elevated temperatures; furthermore, its creep resistance at 982 °C can be compared to those of some Ni-based superalloys. Analysis on experimental results indicate that HESA could be strengthened by the low stacking-fault energy of the matrix, high anti-phase boundary energy of the strengthening precipitate, and thermally stable microstructure. Positive misfit between FCC matrix and precipitate has yielded parallel raft microstructure during creep at 982 °C, and the creep curves of HESA were dominated by tertiary creep behavior. To the best of authors’ knowledge, this article is the first to present the elevated temperature tensile creep study on full scale specimens of a high entropy alloy, and the potential of HESA for high temperature structural application is discussed.

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Section: Resultssupporting

confidence: 76%

The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Tsao

Yeh

Kuo

et al. 2017

Sci Rep

162

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“…Directional solidification processing of the alloy results in a further improvement in its high-temperature properties and hotcorrosion resistance and also permits the use of higher service temperatures, which is very important for enhancing the thermal efficiency of turbines. [2][3][4][5] It has been reported that the tensile strength of directionally solidified Rene´80 (DS Rene´80) is approximately 10 to 15 pct greater, and its creep rupture life is extended by 2 to 4 times, as compared to the conventionally cast material. [5] During service, the hot-section components of the turbines generally experience very severe thermal and mechanical stresses for extended periods, which can cause cracking or material loss.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] It has been reported that the tensile strength of directionally solidified Rene´80 (DS Rene´80) is approximately 10 to 15 pct greater, and its creep rupture life is extended by 2 to 4 times, as compared to the conventionally cast material. [5] During service, the hot-section components of the turbines generally experience very severe thermal and mechanical stresses for extended periods, which can cause cracking or material loss. For cost effectiveness, it is often advantageous to repair the damaged components rather than replace them, and fusion welding is a commonly used repair technique to increase the component life.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Response of Directionally Solidified René 80 Superalloy to Gas-Tungsten Arc Welding

Sidhu

Ojo

Chaturvedi

2008

Metall Mater Trans A

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The microstructural response of directionally solidified Rene´80 (DS Rene´80) superalloy to gas-tungsten-arc (GTA) welding was investigated. Rapid heating during welding resulted in a significant grain-boundary liquation of solid-state reaction product c¢ precipitates, intergranular elemental segregation induced M 5 B 3 borides, and secondary solidification constituents MC carbides and sulfocarbides, which were all present in the preweld heat-treated alloy. Liquation of these particles embrittled the grain boundaries in the heat-affected zone (HAZ) and caused microfissuring along the liquated grain boundaries. Nevertheless, contrary to the generally observed increase in HAZ cracking in superalloys with an increase in Ti and Al concentration, due to increase in the alloy's hardness, significantly reduced cracking was observed in DS Rene8 0 compared to the conventionally cast IN738 welded under the same conditions, despite its hardness being higher than that of IN738. This was related to the nature of base-metal grainboundary intersections at the fusion-zone boundary in these materials.

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Face-Centered Cubic High-Entropy Alloys

Liu

Cao

2022

Advanced Multicomponent Alloys

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Directional Solidification of René 80

Cited by 9 publications

References 8 publications

The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Microstructural Response of Directionally Solidified René 80 Superalloy to Gas-Tungsten Arc Welding

Face-Centered Cubic High-Entropy Alloys

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