Influência de tratamentos térmicos sobre varetas combustíveis de Zr-1.0Nb-1.0Sn-0.1Fe: Evolução microestrutural, propriedades mecânicas e comportamento sob desgaste por fretting
DOI:
https://doi.org/10.15628/holos.2024.15893Palavras-chave:
Fuel rods, Spacer grids, Heat treatments, Fretting wear, Zr-1.0Nb-1.0Sn-0.1Fe alloyResumo
Neste trabalho, estudou-se o comportamento de varetas combustíveis de Zr-1Nb-1Sn-0,1Fe submetendo-as a ensaios físicos visando reproduzir a ocorrência de fretting e reduzir a ocorrência de GTRF por meio de engenharia de superfície/transformação de fase. Para tanto, tratamentos térmicos foram realizados nas superfícies das varetas combustíveis em diferentes temperaturas para modificar a microestrutura (α-Zr a β-Zr) e melhorar as propriedades mecânicas. Os testes mecânicos confirmaram a melhora nas propriedades mecânicas e os testes MEV, EED e DRX confirmaram a modificação da microestrutura da liga. Os testes de fretting foram realizados em equipamentos projetados para induzir deslocamentos horizontais das varetas combustíveis em relação à grade espaçadora. Verificou-se, por microscopia confocal, que os mecanismos de desgaste por fretting observados nas varetas combustíveis incluem abrasão, adesão e deformação plástica, e que o aumento da temperatura de tratamento térmico diminui a perda de massa, indicando desgaste por fretting menos severo
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