Programa de Pós-Graduação em Engenharia Industrial - PPGEI/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/10050
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Navegando Programa de Pós-Graduação em Engenharia Industrial - PPGEI/ITEC por Orientadores "QUARESMA, José Maria do Vale"
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Item Acesso aberto (Open Access) Avaliação da resistência elétrica e mecânica da liga de alumínio série 6101 modificada com 0,16%Nb(Universidade Federal do Pará, 2021-06-28) ALMEIDA, Denyson Teixeira; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290The requirement for better materials for electrical cables has demanded the need of new, stronger and better conductivity aluminum metal composites. 6xxx series alloys, more specifically 6101 and 6201, have been combined with various chemical elements, heat treated and artificially aged to improve mechanical strength and conductivity. Brazil is the largest producer, exporter and holder of the worldwide niobium deposits. Thus, this metal has a high potential as a very promising alloying element for the target material of this study, when it combined with other metals, makes the material superconducting, has a medium grain refinement effect, an aggregating action to improvement of mechanical strength. In this study it will be proposed to add [0.16]%Nb to the Al-0,05%Cu-[0,24-0,28]%Fe-0,5%Si-0,6%Mg, casting in “U” metal shell evaluating the behavior of the heat resistance according to COPEL protocol (Companhia Paranaense de Energia Elétrica), mechanical, electrical resistance and microstructural characterization.Item Acesso aberto (Open Access) Caracterização mecânica e metalúrgica de parafusos da classe 10.9, utilizados na fixação da suspensão dianteira de veículos CAT793D, aplicando tratamento termoquímico de cementação(Universidade Federal do Pará, 2022-08-31) RABELO JÚNIOR, Fábio Alves; CARDOSO FILHO, José Carlos de Araújo; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290When a structural component of a large piece of equipment fails, catastrophic consequences can occur, generating highly measurable economic losses, because a failure leads to an interruption of an entire production line and damage to the workflow, which can cause delays and increased maintenance costs, whether preventive or corrective. In addition, serious risk conditions affect the loss of life in cases of catastrophic accidents, where they are widely reported by the media and strongly influence an organization's conduct. The objective of this work is to carry out the mechanical and metallurgical characterization of screws of class 10.9, applying the Thermochemical Treatment of Cementation, evaluating the influence of this mechanical resistance. These components include the Caterpillar model 793D “Off-Highway” truck suspension system that carries heavy iron ore loads in the Ferro-Carajás complex, in the state of Pará. Thermo-chemical treatments and mechanical tests were carried out and Tensile Stress. Fractographic and Microstructural analyzes were performed using Scanning Electron Microscopy - SEM, in addition to Optical Microscopy.