Reparo induzido pela técnica de emissão de pulsos elétricos (electropulsing) na liga AA5083 utilizada da indústria do petróleo
The electrical pulse processing technique (EPT) on a material can be considered an effective alternative for promoting self-repair mechanisms. This technology can favor the prevention of nucleation, coalescence and propagation of microstructural defects in metallic materials used in several applicat...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/55034 |
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| Resumo: | The electrical pulse processing technique (EPT) on a material can be considered an effective alternative for promoting self-repair mechanisms. This technology can favor the prevention of nucleation, coalescence and propagation of microstructural defects in metallic materials used in several applications in the oil industry. This occurs because through microstructural regeneration promoted by the acceleration of atomic diffusion, movement of dislocations and, in some cases, nucleation and recrystallization mechanisms, the reduction and/or closure of defects in the microstructure are achieved. This research was based on the analysis of the influence
of the application of electrical pulses on specimens (CP) of the AA5083. These were submitted to tensile tests to evaluate the mechanical behavior and to promote microstructural defects that could be repaired later. The CPs were separated into six groups according to the cross-sectional area (15mm2 and 6mm2 ) and the type of treatment (No emission of electrical pulses, 7s of electrical pulses and 15s of electrical pulses). The electropulsing treatment (EPT) were carried out via a closed circuit between the CP and a source with a peak current of 400A and base current of 0A. Thus, the current densities reached were 26.67A/mm2 and 66.67A/mm2. The information obtained from the tensile tests proved that there was an electroplastic effect on the CPs subjected to EPT, as there was a significant increase in the ductility of the materials and a reduction in the maximum and yield stresses. The analysis of residual stresses showed that there was a stress relief of the materials subjected to EPT. And, with images obtained by Scanning Electron Microscopy (SEM) in the modes of secondary electrons (SE) and backscattered electrons (BSE) of the surface, it was
possible to verify the reduction of a crack using the EPT technique |
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