On liquation and liquid phase oxidation during linear friction welding of nickel-base in 738 and CMSX 486 superalloys

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TypeArticle
Proceedings titleProceedings of the International Symposium on Superalloys
Conference12th International Symposium on Superalloys, Superalloys 2012, 9 September 2012 through 13 September 2012, Seven Springs, PA
ISBN9780470943205
Pages587594; # of pages: 8
SubjectAtmospheric oxygen; Conventionally casts; Linear friction welding; Liquation; Liquid-phase oxidation; Micro-structural; Nickel base superalloy; Thermomechanical simulation; Compressive stress; Friction welding; Liquids; Mechanical properties; Nickel; Oxidation; Oxide films; Thermomechanical treatment; Welds; Superalloys
AbstractA systematic study of the microstructural response of conventionally cast IN 738 and single crystal CMSX 486 superalloys during linear friction welding was performed. The results revealed that, aside from a significant liquation of various phases that occurred during joining, continuous oxide films formed on the weld lines in both materials. The weld line oxides consisted of aluminum-rich and hafnium-base oxides in IN 738 and CMSX 486 superalloys, respectively, which can be deleterious to the mechanical properties of the weld joint. Gleeble thermo-mechanical simulation showed that the oxides were produced by the oxidation of some liquid exposed to atmospheric oxygen at the mating surfaces of the work pieces. A practicable method of eliminating liquid phase oxidation during linear friction welding of nickel-base superalloys is discussed.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21269474
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Record identifier10165179-3f44-4f18-89bd-869b37fadd4f
Record created2013-12-12
Record modified2016-05-09
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