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The effect of thermal exposure on the microstructure and mechanical properties of nickel-base superalloys

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Abstract

The three nickel-base superalloys B-1900, TRW-NASA VIA, and René 80 were studied utilizing metallographic and residue analysis techniques in conjuction with mechanical property tests to determine the effect of thermal exposure on the microstructure and mechanical properties. Exposure times of 10, 100, 1000, and 5000 h at temperatures from 1400 to 2000°F (760 to 1093°C) were evaluated. Four minor phases-MC, M6C, M23C6, and M3B2-plus gamma-prime were observed in the gamma matrix of these alloys. Significant variations in the mechanical properties were observed to occur with thermal exposure. Microstructural evaluation indicated that these variations in properties were due primarily to gamma-prime agglomeration or ripening. Perturbations noted in a number of the mechanical property vs exposure temperature curves in the 1500 to 1900°F (816 to 1038°C) temperature range appeared to be due to the precipitation and growth of M6C and/or M23C6 carbides.

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  1. Materials Technology, TRW Inc., 44117, Cleveland, Ohio

    H. E. Collins (Principal Engineer)

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  1. H. E. Collins
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Collins, H.E. The effect of thermal exposure on the microstructure and mechanical properties of nickel-base superalloys. Metall Trans 5, 189–204 (1974). https://doi.org/10.1007/BF02642943

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