T. Khan(Onera
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B.P. 72
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92322 Chatillon Cedex
,
France Manuscript received 26 August 1996)
金属学报(英文版)
This paper describes the key role played by superalloys in aerospace propulsion. Turbopump blades in liquid rocket engines operating under severe thermal and environmental conditions require the development of specific materials.A new superalloy,THYMONEL 8, developed by ONERA in collaboration with SEP is shown to possess a set of properties required for advanced rocket engines. For future civil aircraft engines, the development of compressor and turbine disk materials operating at still higher temperatures requires a greater contrul of the grain size,which has to be increased for improved creep resistance and higher damage tolerance. Work carried out at ONERA emphasizes the importance of high temperature deformation conditions, especially the strain rate, for obtaining a uniform grain growth.
关键词:
:superalloy
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C.X. Shi(National Natural Science Foundation of China
,
Beijing 100083
,
China Manuscript received 26 August 1996)
金属学报(英文版)
A comprehensive survey was made of various candidate high temperature materials for gas turbine use, and their relative merits and drawbacks were assessed. It is shown that superalloys, fine-tuned, will be persistent for the next few decades, to be followed up by high temperature intermetallics. For advanced ceramics, the problems of reliability and cost will have to be solved before they can be used in critical parts of engines.So are C/C composites with their oxidation problem. Surface modification and development of thermal barrier coatings can effectively overcome many problems of gas turbine materials and these technologies should be emphasized.
关键词:
:superalloy
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