File:Pigtail from Single Crystal Blade Casting shown with Kennedy Half Dollar for size comparison.jpg
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DescriptionPigtail from Single Crystal Blade Casting shown with Kennedy Half Dollar for size comparison.jpg |
English: While casting directionally solidified crystals in the late 1960s, AMRDL researcher Barry Piearcey found that if a right-angle bend occurred in the casting mold, a short distance above the knurled chill plate surface (called the “starter” chamber), the number of columnar crystals exiting the bend would be reduced. Two such bends reduced the number even more. Later, while investigating the properties of single-crystal springs, Giamei found that a helical channel with smooth continuous turning was a natural substructure filter, admitting columnar crystals from the starter and emitting one single crystal to start the single- crystal structure of the turbine blade. |
Date | |
Source | Own work |
Author | Lee Langston |
Developed initially by Pratt & Whitney.
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current | 19:01, 22 February 2020 | 1,512 × 2,016 (369 KB) | TomahF (talk | contribs) | User created page with UploadWizard |
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ISO speed rating | 25 |
Date and time of data generation | 08:23, 29 July 2017 |
Lens focal length | 4.15 mm |
Longitude | 72° 28′ 25.41″ W |
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File change date and time | 08:23, 29 July 2017 |
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Date and time of digitizing | 08:23, 29 July 2017 |
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APEX exposure bias | 0 |
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DateTimeOriginal subseconds | 339 |
DateTimeDigitized subseconds | 339 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
GPS time (atomic clock) | 12:23 |
Speed unit | Kilometers per hour |
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Reference for direction of image | True direction |
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Reference for bearing of destination | True direction |
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