Liquation Cracking in Linear Friction Welded Directionally Cast Alloy 247

Linear Friction Welding (LFW) is a rarely used joining technology. To test the suitability of this solid-state process for hot cracking-sensitive nickel base superalloys, tests were performed using conventionally and directionally cast slabs of Alloy 247. Since LFW does not involve melting of the we...

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Bibliographic Details
Published inPraktische Metallographie Vol. 59; no. 10; pp. 641 - 651
Main Authors Neidel, A., Giller, M., Riesenbeck, S.
Format Journal Article
LanguageEnglish
Published De Gruyter 30.09.2022
Subjects
Alloy 247
directionally solidified investment casting
gerichtet erstarrter Feinguss
Heißrissempfindlichkeit
hot cracking sensitivity
Linear-Reibschweißen
nickel base superalloy
Nickelbasis-Superlegierung
translatory friction welding
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Summary:Linear Friction Welding (LFW) is a rarely used joining technology. To test the suitability of this solid-state process for hot cracking-sensitive nickel base superalloys, tests were performed using conventionally and directionally cast slabs of Alloy 247. Since LFW does not involve melting of the weld flanks, there were some expectations that this special welding technique could overcome the poor weldability of Alloy 247. However, all tested specimens failed by liquation cracking (LC) within the Weld Center Zone (WCZ) at the directionally cast side.
ISSN:0032-678X
2195-8599
DOI:10.1515/pm-2022-0059