The 1350 F stress-rupture properties of two wrought alloys and three cast alloys Page: 7 of 24
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6 nACA TN No. 1380
CONCIUSIONS
From an inVestigton of the strss-rupture poperties at 13500 F
of two wrought alloys and three precision-cast alloys, the following.
conclusions were made:
The two wrought alloys, NE-82 (6059 modified-low carbon) and 1R-84
(N-155 modified-low carbon),. had identical 13500 F rupture strengths,
alJthough. alloy 58-84 had much higher ductility. The strengths of these
alloys are somewhat higher than those of standard N-155. alloy, but it
is rather doubtful whether this benefit is sufficient to warrant the
necessary increase in alloy content.
The three precision-cast, alloys, R-71 (X-40), NR-87 (Co-Cr-Ni
base-9Mo),'and I R-90 (Cc-Or-Ni base-Mo, 5W) had 13500 F rupture
strengths which copared favorably with those of alloy 422-19, the best
cobatrchromiPm-nic~cel base alloy previously investigated at 13500 F.
Thby have much lower strengths, however, than the best chromium--base
alloys. Although there was some difference in rupture strengths among
the three .cast alloys, there vwae not a consistent .variation. Other
factors, such as variations possibly due to varying crystal orienta-
tions between specimens, make it impossible to attribute strength
differences observed to chemical composition.
University of Michigan
Ann Arbor, Mich., November 15, 1946L ,.,
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Reynolds, E. E.; Freeman, J. W. & White, A. E. The 1350 F stress-rupture properties of two wrought alloys and three cast alloys, report, November 1947; (https://digital.library.unt.edu/ark:/67531/metadc55436/m1/7/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.