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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 1/2009

01.01.2009

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

verfasst von: R.K. Sidhu, O.A. Ojo, M.C. Chaturvedi

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 1/2009

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Abstract

The microstructural response of directionally solidified René 80 (DS René 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 γ′ precipitates, intergranular elemental segregation induced M5B3 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 René 80 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 grain- boundary intersections at the fusion-zone boundary in these materials.
Vorheriger Artikel Braze Alloy Development for Fast Epitaxial High-Temperature Brazing of Single-Crystalline Nickel-Based Superalloys
Nächster Artikel Prediction of Shrinkage Pore Volume Fraction Using a Dimensionless Niyama Criterion

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JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
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Metadaten
Titel
Microstructural Response of Directionally Solidified René 80 Superalloy to Gas-Tungsten Arc Welding
verfasst von
R.K. Sidhu
O.A. Ojo
M.C. Chaturvedi
Publikationsdatum
01.01.2009
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 1/2009
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-008-9700-5

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