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The effects of weld-repair and hot isostatic pressing on the fracture properties of Ti-5Al-2.5Sn ELI castingsThe Ti-5Al-2.5Sn extremely low interstitial alloy employed in the large castings which form the critical attachment fittings of the Space Shuttle External Tank was selected because of its high fracture resistance at cryogenic temperatures. Casting was selected over alternative fabrication methods because of its lower cost and adaptability to design changes, although it was found necessary to weld-repair surface and subsurface casting defects in order to reduce the scrap rate and maintain the inherent cost advantage of the castings. Hot Isostatic Pressing was experimentally found to heal the surface and internal defects of the castings, but did not improve tensile or fracture properties and was therefore rejected as a production technique. Production castings are instead weld-repaired, without any mechanical property degradation.
Document ID
19830052424
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Misra, M. S.
(Martin Marietta Aerospace Denver, CO, United States)
Lemeshewsky, S.
(Martin Marietta Aerospace Denver, CO, United States)
Bolstad, D.
(Martin Marietta Aerospace Denver, CO, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Metallic Materials
Meeting Information
Meeting: Advanced processing methods for titanium; Symposium
Location: Louisville, KY
Start Date: October 13, 1981
End Date: October 15, 1981
Accession Number
83A33642
Funding Number(s)
CONTRACT_GRANT: NAS8-30300
Distribution Limits
Public
Copyright
Other

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