Influência da variação de temperatura nos aspectos microestruturais e propriedades mecânicas no bronze de alumínio-níquel UNS C63000 submetido ao processo de têmpera
Influence of temperature variation on microstructural aspects and mechanical properties in nickel-aluminum bronze UNS C63000 submitted to the quenching process
Vinicius Torres dos Santos, Márcio Rodrigues da Silva, Huang Han Pang, Flávia Gonçalves Lobo, Givanildo Alves dos Santos, Wilson Carlos da Silva Junior, Antonio Augusto Couto
Resumo
Tendo em vista o grande campo de aplicação industrial de ligas de bronze, torna-se indispensável a realização de estudos metalúrgicos detalhados buscando o desenvolvimento dessas ligas, especificamente bronze de alumínio-níquel, e uma das principais frentes tecnológicas em que o bronze está inserido é nas aplicações aeroespaciais, as quais exigem propriedades mecânicas específicas para que o material de engenharia suporte os esforços envolvidos. Uma das possibilidades do alcance dessas propriedades é por meio da imposição das variáveis presentes no tratamento térmico, o que influência na microestrutura, devido ao fato do bronze possuir transformação martensítica, representada pela fase β, e consequentemente no comportamento mecânico do material. O objetivo deste trabalho é mostrar a relação entre o endurecimento por têmpera, com posterior revenimento, e as propriedades mecânicas geradas no bronze aeroespacial UNS C63000. Os resultados mostram que temperaturas de aquecimento na ordem de 785, 835 e 885 °C, seguidas de resfriamento brusco em água promovem a elevação dos resultados mecânicos, no entanto, nota-se a redução gradativa do percentual de fase α.
Palavras-chave
Abstract
In view of the large field of industrial application of bronze alloys, it becomes essential to carry out detailed metallurgical studies seeking the development of these alloys, specifically nickel-aluminum bronze, and one of the main technological fronts in which bronze is inserted is in aerospace applications, which require specific mechanical properties for the engineering material to support the efforts involved. One of the possibilities of reaching the properties is through the imposition of the variables present in the heat treatment, which influences the microstructure, due to the fact that bronze has martensitic transformation represented by β phase, and, consequently, on the mechanical behavior of the material. The objective of this work is to show the relationship between hardening by quenching, with subsequent tempering, and the mechanical properties generated in the aerospace bronze UNS C63000. The results show that the score in the order of 785, 835 and 885 °C followed by sudden cooling in water promotes an increase in the mechanical results, however, it is noted a gradual reduction in the percentage of α phase
Keywords
Referências
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Submetido em:
20/11/2020
Aceito em:
24/04/2021
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