The 1350 F stress-rupture properties of two wrought alloys and three cast alloys Page: 4 of 24
23 p. : ill.View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
NACA TN No. 1380
Alloys NR-82 and NR-8 were produced by the Union Carbide and
Carbon Corporation. They 'were melted as 100-pound basic
induction heats, hot-forged from 21000 to 14000 F from
3-inch-square ingots to 1-inch-quare bars. Both alloys
were solution-treated i hour at 22000 F, water-quenched, and
aged 50 hours at 13500 F. Test specimens 0.250.nc% in
diameter were machined from the 1-inch bars.
Alloys TI-71, NR-87, and NR-90 were produced by the
Haynes-Stellite Company. They were melted as 24i-pound heats
in an indirect arc-rocking furnace and precision-cast as
0.250-inch-diameter test specimens. The specimens were aged
50 hours at 13500 F before testing.
PROCEDUEE
Stress-rupture tests at 13500 F -ere run to at least 1000 hours
to determine the rupture strenGths for the five alloys. The longest-
time rupture-test specimen of each alloy was. examined metallograh-.
ically and its hardness determined.
The rupture tests were conducted as follows: The stress was ap-
p'lied to the specimen by weights acting through a simple beam and
system of knife edges. The specimens were held at test temperature
for approximately 24 hours before application of the load to allow for
temperature-distribution adjustments.. Time -elongation data were ob-
tained for the tests by measuring thd drop of the loading beam during
the test.
The longest-time rupture-test specimen of each material was.sec-
tioned longitudinally adjacent to the fracture. Photomicrographs at a
100-diameter magnification were taken of the fractured portion of the
specimen and at a 1000-diameter magnification of the interior structure
of the specimen near the fracture.
Vickers hardness tests were made on the metallographic specimens.
RESULTS
The 13500 F rupture-test 'results for the five alloys studied are
given in table II. These data are plotted in figure 1 on logarithmic
coordinates of stress against time for rupture. The rupture strengths
and the estimated rupture-test ductilities at 100, 500, and 1000 hours
are given in table III.3
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/4/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.