STP68

    Heat-Resisting Metals for Gas-Turbine Parts

    Published: Jan 1946


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    Abstract

    This report shows the results of high-temperature tests on heat-resisting alloys carried out under National Defense Research Committee Project NRC-8 to study and evaluate new alloys and supply needed information to the Armed Forces and their contractors.

    The materials studied ranged from modified 18 per cent chromium-8 per cent nickel steels to practically iron-free cobalt-chromium and cobalt-chromium-nickel alloys with additions singly or in combination of molybdenum, tungsten, columbium, tantalum, titanium, aluminum, boron, and nitrogen.

    Short-time tension tests were made on the precision-cast cobalt-base alloys at 1000 to 1600 F.

    Stress-rupture tests were made at 1500, 1600, and 2000 F. to determine the stresses for rupture in times varying from 100 to 1000 hr.

    Creep tests were made at 1350, 1500, and 1600 F. to pick out the better alloys and to determine the stresses required to produce creep rates of 0.00001 per cent per hour.

    The cast cobalt-base alloys show better stress-rupture and creep properties generally than the forged alloys, except for creep resistance at 1350 F. Design curves based on both stress-rupture and creep data at 1500 F., show that for low values of total deformation, some of the forged alloys are superior to the cast alloys.

    Relaxation creep tests for predicting high-temperature bolting performance were made on a few alloys at 1050 to 1500 F.


    Author Information:

    Cross, Howard C.
    Supervisor and Research Engineer, Battelle Memorial Inst., Columbus, Ohio.

    Simmons, Ward F.
    Supervisor and Research Engineer, Battelle Memorial Inst., Columbus, Ohio.


    Paper ID: STP44966S

    Committee/Subcommittee: A01.13

    DOI: 10.1520/STP44966S


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