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Master's Dissertation
DOI
10.11606/D.88.2016.tde-16092016-113006
Document
Author
Full name
Rosamel Melita Muñoz Riofano
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1997
Supervisor
Committee
Casteletti, Luiz Carlos (President)
Rodrigues, José de Anchieta
Zavaglia, Cecília Amélia de Carvalho
Title in Portuguese
Efeito das variáveis de nitretação por plasma na resistência à abrasão de um aço "maraging"
Keywords in Portuguese
Aço maraging
Desgaste abrasivo
Nitretação iônica
Abstract in Portuguese
Visando-se a avaliação do desempenho de um sistema de nitretação por plasma que se construiu bem como a determinação da influência das variáveis do processo sobre o desempenho das camadas nitretadas ionicamente, foram nitretadas amostras do aço "maraging" com a seguinte composição: Fe - 18Ni - 4.2Mo - 12.3Co - 1.7Ti - 0.15Al - 0.03C. Foram variadas as seguintes condições de processo: tempo, temperatura, freqüência do pulso e condição de tratamento térmico prévio. Foram realizadas análises metalográficas, difração de raios-X, microdureza e ensaios de abrasão do tipo "pino-sobre-disco" para caracterização das camadas obtidas. O equipamento de nitretação apresentou excelente desempenho no tratamento das amostras utilizadas e o aço "maraging", excelente resposta ao tratamento de nitretação. O tempo de tratamento de 3 horas produziu as camadas mais resistentes à abrasão. Os tratamentos com corrente contínua produziram resistências à abrasão superiores às obtidas com corrente pulsada. As amostras nitretadas após o envelhecimento apresentaram resistências superiores às envelhecidas simultaneamente com a nitretação.
Title in English
Effect of the plasma nitriding variables in the abrasion resistance of the maraging steel
Keywords in English
Abrasive wear
Ion nitriding
Maraging steel
Abstract in English
Pursuing the evaluation and performance of a nitration system via plasma for us constructed, as well as the determination of the influence of variables of the process on the performance of ionically nitrated layers, it was nitrated maraging steel samples with the next compositions: Fe -18Ni - 4,2Mo - 12,3Co - 1,7Ti - 0,15AI- 0,03C. The following processing conditions were modified: time, temperature, pulse frequency end previous thermal treatment condition. Metallografic analyses, X-ray diffraction, microhardness and pin-on-dick type abrasion test were practised on samples for characterization of their layers. The nitration equipment had excellent performance in the treatment of samples used while the "maraging" steel showed excellent answer to the nitration treatment. A treatment time of three hours produced the more resistant layers to abrasion. The treatments with continuous current produced abrasion resistance higher than in treatment with pulsed current post-aged nitrated samples showed higher resistances than those aged during the nitration.
 
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Publishing Date
2016-09-16
 
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