Resumo

WINSTONE, M. R  e  BROOKS, J. W.. Advanced high temperature materials: Aeroengine fatigue. C.Tecn. Mat. [online]. 2008, vol.20, n.1-2, pp.15-24. ISSN 0870-8312.

The aeroengine business is intensely competitive and commercial success relies on continuous improvements in engine efficiency, with reduced environmental impact and lower operating costs.  Innovation through advanced materials is a powerful tool in the quest for market share. This paper discusses the recent advances in materials technologies for aeroengine components with particular reference to enhancing the fatigue life of turbine disc components. Computational modelling of materials processing is contributing strongly to the improved design of the microstructure and the delivery of enhanced high temperature fatigue properties. Future trends are towards new manufacturing approaches in which the microstructure/composition is varied within the component in response to the service temperature and stress distribution. Dual microstructure and dual alloy concepts are described. Implementation of these approaches requires detailed knowledge of microstructure/property relationships and process models to simulate the structure generated during the complex thermomechanical processing.

Palavras-chave : Nickel alloys; Fatigue; Crack growth; Thermomechanical processing.

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