EVALUATION OF CREEP BEHAVIOR OF TI-6AL-4V ALLOY WITH THERMAL BARRIER COATING DEPOSITED BY AIR PLASMA SPRAY
AVALIAÇÃO DO COMPORTAMENTO EM FLUÊNCIA DA LIGA TI-6AL-4V COM RECOBRIMENTO COMO FORMA DE BARREIRA TÉRMICA DEPOSITADO POR ASPERSÃO TÉRMICA
Filipe Estevão de Freitas, Adriano Gonçalves dos Reis, Danieli Aparecida Pereira Reis
Abstract
Titanium alloys have attractive properties for application in aeronautical components submitted to high temperature. Yttria-stabilized zirconia (YSZ) of thermal barrier coating systems (TBC) have become an alternative to increase the operational lifetime of turbine blades. The aim of this work was to evaluate the creep behavior of Ti-6Al-4V with TBC deposited by air plasma spray. Constant load creep tests were conducted in air on equiaxed Ti-6Al-4V (uncoated) and Ti-6Al-4V with TBC and the experimental parameters related to secondary creep were determined. All the coated samples showed a reduction of secondary creep rate values and, thereafter, higher creep resistance, which could be associated with oxidation protection and thermal insulation provided by the coating. Creep rate analysis suggests that the dominant creep mechanisms in all cases is the dislocation climb.
Keywords
Resumo
Ligas de titânio possuem propriedades atrativas para aplicação em componentes aeronáuticos submetidos a altas temperaturas. O revestimento de barreira térmica (TBC) de zircônia estabilizada com ítria (YSZ) tem se tornado uma alternativa para aumentar a vida operacional das palhetas de turbina. O objetivo deste trabalho foi avaliar o comportamento em fluência da liga Ti-6Al-4V com recobrimento TBC depositado por aspersão térmica. Os ensaios foram conduzidos em carga constante e ao ar em amostras de Ti-6Al-4V com estrutura equiaxial com e sem recobrimento TBC e foram determinados os parâmetros experimentais relacionados à fluência secundária. Todas as amostras revestidas mostraram uma redução dos valores da taxa de fluência secundária e, consequentemente, maior resistência à fluência, que pode ser associada à proteção contra oxidação e à barreira térmica fornecida pelo revestimento. A análise da taxa de fluência sugere que o mecanismo de fluência dominante em todos os casos é a escalagem de discordâncias
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Referências
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