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A new aging treatment for improving cryogenic toughness of the main structural alloy of the super lightweight tank

Author: P S Chen; W P Stanton; George C. Marshall Space Flight Center,; United States. National Aeronautics and Space Administration,
Publisher: MSFC, Alabama : National Aeronautics and Space Administration, Marshall Space Flight Center, November 1996.
Series: NASA technical memorandum, 108524.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
Marshall Space Flight Center (MSFC) has developed a new technique that can enhance cryogenic fracture toughness and reduce the statistical spread of toughness values in alloy 2195. This aging treatment can control the location and size of strengthening precipitate T1, making improvements possible in cryogenic fracture toughness (CFT) and fracture toughness ratio (FTR). At the start of this program, design of  Read more...
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Details

Genre/Form: Technical Memorandum
Additional Physical Format: Microfiche version:
Chen, P. S.
New aging treatment for improving cryogenic toughness of the main structural alloy of the super lightweight tank
(OCoLC)37495350
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: P S Chen; W P Stanton; George C. Marshall Space Flight Center,; United States. National Aeronautics and Space Administration,
OCLC Number: 703645444
Notes: Title from title screen (viewed May 6, 2016).
"November 1996."
"Performing organization: George C. Marshall Space Flight Center, Marshall Space Flight Center, Alabama"--Report documentation page.
Description: 1 online resource (vii, 10 pages) : illustrations.
Series Title: NASA technical memorandum, 108524.
Responsibility: P.S. Chen, W.P. Stanton.

Abstract:

Marshall Space Flight Center (MSFC) has developed a new technique that can enhance cryogenic fracture toughness and reduce the statistical spread of toughness values in alloy 2195. This aging treatment can control the location and size of strengthening precipitate T1, making improvements possible in cryogenic fracture toughness (CFT) and fracture toughness ratio (FTR). At the start of this program, design of experiments (DOE) ingot No. 10 was used as a baseline for aging process development and optimization.The new aging treatment was found to be very effective, improving CFT by approximately 15 to 20 percent for DOE ingot No. 10. To further evaluate the repeatability and effectiveness of this new treatment, the investigators selected and tested three more lots of alloy 2195, using 1.75-in-thick gauge plates with FTR values ranging from 0.85 to 1.07. The new aging treatment effectively enhanced CFT and FTR values for all three lots. In one instance, the material was considered rejectable because it did not meet the minimum FTR value (1.0) of the super lightweight tank (SLWT). The new aging treatment improved its FTR from 0.85 to 1.01, making this material acceptable for use in the SLWT.

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