Neutron Diffraction Characterization of Residual Strain in Welded Inconel 718 for NASA Space Shuttle Flow Liners

Journal Article · Mon Jun 28 04:00:00 EDT 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1774566· OSTI ID:20653208

Rathod, C R; Vaidyanathan, R ^[1]; Livescu, V; Clausen, B; Bourke, M A. M. ^[2]; Notardonato, W U; Femminineo, M ^[3]

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1. University of Central Florida, Orlando, Florida, 32816 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico, 87545 (United States)
3. NASA Kennedy Space Center, Kennedy Space Center, Florida, 32899 (United States)

This work quantitatively assesses residual strains and stresses associated with the weld repair process used to repair cracks on NASA's space shuttle flow liners. The coupons used in this investigation were made of the same INCONEL 718 alloy used for the flow liners. They were subjected to identical welding and certification procedures that were carried out on the space shuttle. Neutron diffraction measurements at Los Alamos National Laboratory determined residual strains at selected locations in a welded coupon at 293 K and 135 K. The weld repair process introduced Mises effective residual stresses of up to 555 MPa. On comparing the measurements at 293 K and 135 K, no significant change to the residual strain profile was noted at the low temperature. This indicated minimal mismatch in the coefficients of thermal expansion between the base metal and the weld.

• OSTI ID: 20653208
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 711; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERTIFICATION
CRACKS
INCONEL 718
LANL
NASA
NEUTRON DIFFRACTION
PRESSURE RANGE MEGA PA 100-1000
REPAIR
RESIDUAL STRESSES
SPACE SHUTTLES
STRAINS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL EXPANSION
WELDED JOINTS
WELDING