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National Advisory Committee for Aeronautics, Technical Notes - Office of Naval Research and NACA Metallurgical Investigation of a Large Forged Disc of Inconel X Alloy

The properties of a large forged disc of Inconel X alloy at room
temperature, 12000, 13500, and 15000 F were studied in order to determine
the level of _properties obtainable in a forging of the type required for
the rotor discs of gas turbines. The disc was tested in the solution—
treated and aged condition. The first tests were made on the alloy given
a single aging treatment at 13000 F, but it was found that the alloy
possessed better properties when given a double aging treatment, first
at 15500 F, and then at 13000 F. Mbst of the test data reported herein
were Obtained on the alloy given the double aging treatment. The data
reported include the results of tensile, impact, rupture, time—deformation,
creep, and structural—stability tests.

In general, the Inconel X disc for time periods up to 1000 hours had
as high, or higher, properties than other heat—resisting alloys tested at
12000 F. Its superiority decreased with test temperature so that there
was relatively little difference between it and other alloys at 15000 F.

It was unusual in that third—stage creep occurred early in all tests,
but particularly at 13500 and 15000 F. The disc also retained high duc—
tility at room temperature after prolonged exposure to stress at high
temperatures.

This report presents the results of a study of the roomrtemperature,
1200o , 13500, and 15000 F properties of a large disc of Inconel X alloy
tested in the solutionrtreated and aged condition.

The purpose of this study was to determine the level of properties
exhibited by Inconel X alloy in the form of large forgings of the type
required for rotor discs of gas turbines. The results obtained previously
from.investigations on Timken, GSA, EME, l9—9DL, low—carbon N—155, S—590,
and 8—816 discs of similar size are contained in reports listed as
references 1 through 12.