Determina??o do perfil t?rmico em amostras de a?o AISI M35 imersas em plasma

• Main Author: Galv?o, Nierlly Karinni de Almeida Maribondo
• Other Authors: CPF:09621199468
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2014
• Subjects: Gradiente t?rmico; C?todo oco; A?o M35; Plasma; Thermal gradient; Hollow cathode; M35 steel; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/12856

Made available in DSpace on 2014-12-17T14:07:19Z (GMT). No. of bitstreams: 1 NierllyKAMG.pdf: 1438330 bytes, checksum: d5fc2399ebd1b5a6e21ea3718fff6716 (MD5) Previous issue date: 2007-03-22 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior === The heat transfer between plasma and a solid occurs mostly due the radiation and the collision of the particles on the material surface, heating the material from the surface to the bulk. The thermal gradient inside the sample depends of the rate of particles collisions and thermal conductivity of the solid. In order to study that effect, samples of AISI M35 steel, with 9,5 mm X 3,0 mm (diameter X thickness) were quenched in resistive furnace and tempereds in plasma using the plane configuration and hollow cathode, working with pressures of 4 and 10 mbar respectively. Analyzing the samples microstructure and measuring the hardness along the transversal profile, it was possible to associate the tempered temperature evaluating indirectly the thermal profile. This relation was obtained by microstructural analyzes and through the hardness curve x tempered sample temperature in resistive furnace, using temperatures of 500, 550, 600, 650 and 700?C. The microstructural characterization of the samples was obtained by the scanning electron microscopy, optic microscopy and X-ray diffraction. It was verified that all samples treated in plasma presented a superficial layer, denominated affected shelling zone, wich was not present in the samples treated in resistive furnace. Moreover, the samples that presented larger thermal gradient were treated in hollow cathode with pressure of 4 mbar === A transfer?ncia de calor entre o plasma e um s?lido ocorre principalmente atrav?s da radia??o e colis?o das part?culas sobre a superf?cie do material, o que faz com que o aquecimento do material aconte?a da superf?cie para seu interior. Dependendo da taxa de colis?es das part?culas e da condutividade t?rmica do s?lido, haver? gradientes t?rmicos no interior das amostras. A fim de estudar esse efeito, amostras de a?o AISI M35, com 9,5 mm X 3,0 mm (di?metro X espessura) foram temperadas em forno resistivo e revenidas em plasma, nas configura??es c?todo planar e c?todo oco, com press?es de trabalho de 4 e 10 mbar, para ambas as configura??es. Analisando a microestrutura das amostras e medindo as durezas ao longo do perfil transversal pode-se associar ? temperatura de revenido avaliando indiretamente o perfil t?rmico. Essa rela??o foi obtida atrav?s de an?lise microestrutural e da curva dureza x temperatura de amostras revenidas em forno resistivo, utilizando temperaturas de 500, 550, 600, 650 e 700?C. A caracteriza??o microestrutural das amostras foi realizada atrav?s da microscopia eletr?nica de varredura (MEV), microscopia ?ptica (MO) e difra??o de raios-X (DRX). Verificou-se que todas as amostras tratadas em plasma apresentaram uma camada superficial, denominada de zona afetada por bombardeamento, que n?o se encontra presente nas amostras tratadas em forno resistivo. Al?m disso, verificou-se que as amostras que apresentaram maior gradiente t?rmico foram as tratadas em c?todo oco com press?o de 4 mbar