Advanced high temperature materials: Aeroengine fatigue

 

M. R Winstone*,  J. W. Brooks**

 

*Physical Sciences Department, Defence Science and Technology Laboratory, Porton Down, Salisbury, SP4 0JQ, UK

 ** QinetiQ Ltd., Cody Technology Park, Farnborough, GU14 0LX, UK

 

ABSTRACT: 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. 

Keywords: Nickel alloys, Fatigue, Crack growth, Thermomechanical processing

 

RESUMO: A indústria de turbinas de aviões é altamente competitiva e nela o sucesso depende de melhorias contínuas naeficiência dos motores, na redução dos impactos ambientais e no abaixamento dos custos operacionais. A inovação através demateriais avançados é um poderoso instrumento na procura de cota de mercado. Este artigo discute os avanços recentes emtecnologias de materiais para componentes de turbinas de avião, com particular referência à melhoria da vida à fadiga dediscos de turbinas e seus componentes. A modelação computacional do processamento dos materiais contribui fortementepara a melhoria do projecto de microestrutura e para se conseguirem melhores propriedades de fadiga a alta temperatura. Astendências futuras apontam para novas abordagens de fabrico nas quais a microestrutura e composição são variadas nocomponente em resposta à temperatura de serviço e distribuição de tensões. Microestruturas duais e conceitos dual alloy são discutidos. A implementação destas abordagens requer conhecimento detalhado das relações microestrutura/propriedades emodelações do processo para simular a estrutura obtida durante processos termomecânicos complexos.

Palavras chave: ligas de níquel, fadiga, crescimento de fissura, processamento termomecânico

 

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