Transcription of Characterization of Freckles in a High Strength Wrought ...
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Characterization of Freckles in a High Strength Wrought ...
Characterization OF Freckles IN A HIGH Strength Wrought NICKEL SUPERALLOY. Paul D. Genereuxand Christopher A. Borg Pratt & Whitney United Technologies 400 Main Street East Hartford, Connecticut 06108. Abstract Freckles .' Segregationresulting in tree rings is not consideredto have a significant effect on mechanical properties; however, the Nickel basesuperalloys, such as Gatorizable Waspaloy@,U-720@, latter two are generally consideredto be detrimental. White spots, and Rene 88@ contain relatively high weight percents of as the name suggests,appear as light etching regions and are hardening elements ( Al & Ti), for a conventionally cast generally lower in alloying elements ( , Ti or Nb). The (VlM/VAR or VIM/ESR/VAR) and Wrought (press and or rotary formation of white spots is generally consideredto be causedby forged) product. Due to the higher volume fraction of gamma one of the following three elements: 1.) fall-in of shelf or crown prime, this class of alloys has increased susceptibility for the material into the melt pool, 2.
defect in the class of wrought, high volume fraction y’ subsequently sectioned and the detailed metallurgical evaluation superalloys, which defines Gatorizahle Waspaloy.
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