2022-01-262022-01-262021-07-08LOAYZA, Cristhian Ricardo. Aço inoxidável nanoestruturado produzido via soldagem a arco elétrico. Orientador: Eduardo de Magalhães Braga. 2021. 268 f. Tese (Doutorado em Engenharia de Recursos Naturais da Amazônia) - Instituto de Tecnologia, Universidade Federal do Pará, Belém, 2021. Disponível em: http://repositorio.ufpa.br:8080/jspui/handle/2011/13872. Acesso em:.https://repositorio.ufpa.br/handle/2011/13872Manufacturing methods of nanostructured stainless-steel composites (NSSC) have not yet been developed with industrial applicability. To overcome this shortage, the possibility of incorporating nanoparticles by electric arc welding was investigated, using a tubular rod filled with nanostructured flux composed of multi-walled carbon nanotubes (MWCNT) and 304L stainless steel particles. This flux was manufactured by two different methods: mechanical alloying (MA) and chemical treatment (CT) with hydrogen peroxide. The second showed more promising results using control of kinetic parameters of time and temperature, obtaining a lower degree of amorphous carbon, impurities, and crystalline defects, increasing their crystallinity and interaction of the nanotubes with the metallic matrix. MWCNT incorporation decreased the grain size by 64% when compared to the stainless-steel coating, possessing an austenitic matrix with carbide precipitation in the interdendritic spaces and grain boundaries. The microhardness increased 45% and the rate of erosion by vibratory cavitation decreased 64%, in relation to the AISI 304L coating. Additionally, XRD analyses showed a reduction of the γ{200} phase and a growth of γ{111} after the cavitation process. The method of manufacture of the nanocomposites proved to be economically viable and with the possibility of immediate application on a large scale.Acesso AbertoAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/Aço inoxidávelNanotubos de carbonoCompósitosDRX difração de raio XMES - microscopia eletrônicaEBSD - Difração de eletrons retroespalhadosStainless-steelcarbon nanotubesCompositesXRD - X-Ray diffractionSEM - Electronic microscopyEBSD - Electron backscatter diffractionTeseCNPQ::ENGENHARIASMATERIAIS E PROCESSOS DE FABRICAÇÃOUSO E TRANSFORMAÇÃO DE RECURSOS NATURAIS