The 1350 F stress-rupture properties of two wrought alloys and three cast alloys Page: 3 of 24
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2 NACA TN No. 1380
A correlation of NACA and VSRD (Project NRC-8) data is presented,
showing the variation of rupture strengths with temperature in the
range of 13500 to 20000 F for the alloys.
INMFODUCTION
A program of research, which has as its aim the development of
better alloys for use at the elevated temperatures encountered in the
present-day--aitcraft. power plants, is is in progress under the sponsorship
and with the financial assistance of the National Advisory Cemnittee
for Aeronautics at the University of Michigan. As part of this in-
vestigation, the rupture-tbst chetactertstics of two new wrought alloys
and three new cast alloys were studied at 13500 F. This work was begun
because the 15000 and 16000 F properties, determined in the CSRD re-
search program (references I and 2) showed these to be promising
alloys.
TEST MATERIALS
Five alloys, two in the wrought form and three as castings, were
submitted as test specimens in the heat-treated condition by the
National Research Council (Project NRI-8). qnly material sufficient
for the 13500 F rupture tests was supplied.
Chemical analyses of the 'five alloys are given in table I. The
two wrought alloys, NR-82 and NR-S4 are modificationeof two alloys
previously investigated. I!-82 is Alloy 6059 in which the carbon was
lowered from 0.46 to 0.17 percent and one -half of the 6 percent molyb-
denum replaced by 2 percent tungsten and 1 percent columbium. NR-84
is a modification of alloy N-155 in which the carbon is 0.14 percent
instead of 0.35 percent; chromium, nickel, and cobalt each raised from
20 to 23-24 pecent; and the molybdenum--tunmsten-colwubiim ratio
changed from 3:2:1 to 4:1:1. The cast alloys, NR-71 (X-40), NR -87,
and NR-90, are cobalt-chromizm-nickel base alloye with varying amounts
of molybdenum and tungsten.
Manufacturing procedure and heat treatment of the five alloys aze
as follows:
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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/m1/3/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.