A statistical study of the effects of processing upon the creep properties of GRCop-84

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:640

Article

Ellis, D. L.¹  Carter, J. L. W.²  Ferry, M. H.³ 

[1] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

[2] Univ Calif Davis, Davis, CA 95616 USA

[3] ATI Powder Met, Pittsburgh, PA 15205 USA

关键词: Creep properties;    Processing;    Texture;    Copper alloy;   

DOI  :  10.1016/j.msea.2015.05.028

来源: Elsevier

【 摘 要 】

Reusable launch vehicles require main combustion chamber liner materials that can withstand elevated temperatures and high stresses without creeping. GRCop-84 (Cu-8 at% Cr-4 at% Nb) was developed to meet this need. The Cr2Nb precipitates formed in the alloy strengthen the Cu matrix by impeding dislocation motion and inhibiting grain growth. GRCop-84 has been produced in a variety of forms, each with a unique processing history. The creep properties of the various forms were compared, and results demonstrated that processing had a statistically significant, quantifiable effect upon the creep properties of GRCop-84. The differences in creep properties could largely be explained by texture, testing environment and scatter of the test results. Even with the statistical differences, GRCop-84 did not show grossly different creep results as a function of processing, indicating that any of the processing methods would be suitable for producing a rocket engine liner. Published by Elsevier B.V.

【 授权许可】

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