Abstract
Abstract : The work conducted during the first half of a 36-month research program to investigate structural utilization of oxidation resistant dispersion-strengthened metals (DSM) is described. The program was initiated to assess their use in structures that will experience repeated service at elevated temperatures in the range of 1400F to 2400F. The entire effort is divided into five phases to provide an orderly investigation in the areas of (1) structural design requirements, (2) material survey and evaluation, (3) structural design allowables, (4) structural test assembly design and (5) structural assembly evaluation. Phases I, II and III results are described. The environments of several classes of future vehicles that may use DSM are characterized, typical structures applicable to the vehicles are discussed, and evaluations of candidate materials are presented. Evaluation efforts were limited to DS nickel-base alloys. The selection of a DS nickel-chromium alloy (Ni-20Cr-2ThO2) resulted from material evaluations, and the ensuing subscale structural component fabrication and test efforts on Ni-20Cr-ThO2 are described. Also, results of structural efficiency studies, cost studies and structural design sensitivity studies are reported. Such studies were conducted to compare Ni-20Cr-2ThO2 with other existing evaluated temperature materials in terms of weight, cost and design sensitivity. The existing materials used in comparative studies were Hastelloy X, Haynes 25, Rene 41 and coated columbium (Cb-752). (Author)
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