Physical Data on Certain Alloys for High Temperature Applications Page: 3 of 256

                                
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Dr. Marcus A. Grossmann, Crinegie-IllinOis Steel Corporation
Dr. George W. Lewis, NACA (ex officio)
Mr. Russell G. Robinson, NACA (ex officio)
An advance confidential report entitled "Physical Data on
Certain Alloys for High Temperature Applications" was compiled by
the Coordination Office of the National Advisory Committee for Aero-
nautics in October, 1942 based upon data obtained by the University
of Michigan up to that time. Nitrogen analyses have been made for
several of the materials presented in the October, 1942 report, and
in addition the names of several of the alloys have been changed to
prevent confusing them with materials tested later in the program.
For these reasons it was believed advisable to include in this pres-
ent report all materials that have been tested at the University of
Michigan in this research. Therefore this present report supersedes
.the report prepared by the Committee in October, 1942.
The investigation is being conducted for the purpose of devel-
oping alloys with the best possible combination of load-carrying
ability at 12000 F., and yield strength at room temperature. These
qualities were selected since they are indicative of the properties
required in materials for turbosupercharger wheels.
Full cognizance is taken of the importance of developing alloys
which contain the least possible amount of strategic metals and yet
have the necessary properties to withstand turbosupercharger wheel
service. Forgeability and machinability, likewise, are receiving
consideration. No information is presented on such factors as
weldability, and production practice, although they have received
consideration by the Subcommittee.
The results of the investigation indicate that both the load-
carrying ability at 12000 F. and the room-temperature properties of
most of the alloys can be increased by mechanically working the
alloys at temperatures below the normal hot-working temperatures.
Since .it appears that this factor has more influence than compara-
tively wide variations in chemical composition for a given type of
alloy, the research is now being extended to include an intensive
investigation on the effect of treatment on the strength character-
istics of several materials that are shown by these present tests
to be of special interest.
The materials used in this investigation were supplied by the
Allegheny Ludlum Steel Company, Carnegie-Illinois Steel Corporation,
Crucible Steel Company, General Electric Company, International Nickel
Company, Inc., Timken Roller Bearing Company, Union Carbide and Carbon
Research Labcratories, Inc., and Universal-Cyclops Steel Corporation.
The cooperation of those steel companies in preparing experimental and
production steels contributed greatly to the investigation.