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Soldadura de Ligas de Alta Entropia
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As ligas de alta entropia (HEA) são ligas com cinco ou mais elementos principais em
concentrações entre 5 e 35%. Estas foram criadas em laboratório em busca de materiais com
características diferenciadoras capazes de responder às necessidades atuais da indústria. Para
que as aplicações que se espera deste material possam ser postas em prática, é importante
conseguir formar estruturas complexas a partir de outras mais simples. Para este efeito, a
soldadura é um dos processos mais utilizados, tornando-se relevante o estudo da
soldabilidade destas ligas.
Apesar de já haver estudos relativamente à soldadura de diversas ligas, principalmente
da liga de Cantor (CrMnFeCoNi), é relevante explorar a soldabilidade de outros sistemas de
liga. Como tal, este trabalho centra-se no estudo da soldadura TIG nas HEA
Co20Cu20Fe20Mn20Ni20 e Co17,5Cu30Fe17,5Mn17,5Ni17,5, de modo a avaliar os efeitos que esta técnica
provoca na microestrutura e nas propriedades mecânicas destas HEA.
Após analise dos resultados obtidos, verificou-se que as HEA se mostraram com uma
boa soldabilidade já que se obtiveram cordões de soldadura com penetração total e sem
defeitos. No entanto, a dureza, resistência mecânica e ductilidade reduziram significativamente
relativamente ao material base. A fratura das amostras soldadas ocorreu na ZF apresentando
uma superfície de fratura com características frágeis.
High entropy alloys (HEA) are alloys with five or more main elements in concentrations between 5 and 35%. These were created in the laboratory, in search of materials with differentiating characteristics capable of responding to the current needs of the industry. For the applications expected of this material to be put into practice, it’s important to be able to form complex structures from simpler ones. To this end, welding is one of the most used processes, making it relevant to study the weldability of these alloys. Although there are already studies regarding the welding of various alloys, mainly the Cantor alloy (CrMnFeCoNi), it is relevant to explore the weldability of other alloy systems. As such, this work focuses on the study of TIG welding in HEA Co20Cu20Fe20Mn20Ni20 and Co17,5Cu30Fe17,5Mn17,5Ni17,5, to evaluate the effects that this technique has in the microstructure and mechanical properties of these HEA. After the analysis of the obtained results, it was found that the HEA showed good weldability since weld seams were obtained with total penetration and without defects. However, the hardness, mechanical resistance and ductility were significantly reduced in relation to the base material. The fracture of the welded specimens occurred in the ZF, presenting a fracture surface with brittle characteristics.
High entropy alloys (HEA) are alloys with five or more main elements in concentrations between 5 and 35%. These were created in the laboratory, in search of materials with differentiating characteristics capable of responding to the current needs of the industry. For the applications expected of this material to be put into practice, it’s important to be able to form complex structures from simpler ones. To this end, welding is one of the most used processes, making it relevant to study the weldability of these alloys. Although there are already studies regarding the welding of various alloys, mainly the Cantor alloy (CrMnFeCoNi), it is relevant to explore the weldability of other alloy systems. As such, this work focuses on the study of TIG welding in HEA Co20Cu20Fe20Mn20Ni20 and Co17,5Cu30Fe17,5Mn17,5Ni17,5, to evaluate the effects that this technique has in the microstructure and mechanical properties of these HEA. After the analysis of the obtained results, it was found that the HEA showed good weldability since weld seams were obtained with total penetration and without defects. However, the hardness, mechanical resistance and ductility were significantly reduced in relation to the base material. The fracture of the welded specimens occurred in the ZF, presenting a fracture surface with brittle characteristics.
Descrição
Palavras-chave
Alta entropia TIG Co20Cu20Fe20Mn20Ni20 Co17,5Cu30Fe17,5Mn17,5Ni17,5 Propriedades mecânicas