Análise de Falha do Anel de Vedação de Aço Utilizado em Turbomáquinas
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A análise metalográfica, a microscopia eletrónica de varrimento, a nanoindentação e o ensaio de tração in situ foram utilizados para analisar as causas da falha do anel de vedação, tanto à escala macroscópica como microscópica. A principal razão da falha do anel de vedação é uma combinação de tensão e temperatura elevada durante o funcionamento da turbina.
O ambiente de trabalho complexo provocou a recristalização e a recuperação, resultando no refinamento do grão e na precipitação de fases secundárias. Durante a utilização, surgiram muitos precipitados de fase secundária nos limites dos grãos, provocando a formação de microvazios e fissuras, que acabaram por conduzir à falha do anel.
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£27.18
£28.33 -
£10.58
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