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NASA Technical Reports Server (NTRS) 19790003007: Deformation and a... |
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by NASA Technical Reports Server (NTRS) |
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The elevated temperature properties (tensile and creep) |
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of NiCrALY, a nickel base alloy containing nominally 16% |
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chromium, 4% aluminum, and 2 to 3% yttria (Y2O3) were |
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evaluated and the optimal combination of thermomechanical |
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treatments for maximum creep resistance was determined. |
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Stored strain energy in as-extruded bars (14:1 extrusion |
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ratio) permitted the development of a large grain size in |
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the material when it was annealed at the maximum safe |
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temperature 2450 F (1343 C). With a one-hour anneal at |
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this temperature, the relatively fine grain size of the |
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as-extruded material was changed to one in which the |
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average grain diameter approached 1 mm, and the aspect |
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ratio was about 10. The material was capable of being |
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cold worked (by rolling) in amounts greater than 30% |
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reduction in area. When the cold worked material was |
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given a relaxation treatment, consisting of heating one |
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hour at 1600 F(871 C), and then a high temperature anneal |
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at 2450 F (1343 C) for one hour, both the high |
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temperature strength and the high temperature creep |
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resistance of the material was further enhanced. |
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Date Published: 2016-07-30 15:46:17 |
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Identifier: NASA_NTRS_Archive_19790003007 |
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Item Size: 104012624 |
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Language: english |
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Media Type: texts |
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