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Master's Dissertation
DOI
10.11606/D.88.2016.tde-15092016-144423
Document
Author
Full name
Nery Eugenio Chavez Bermudez
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1999
Supervisor
Committee
Casteletti, Luiz Carlos (President)
Francisco, Regina Helena Porto
Ishikawa, Tomaz Toshimi
Title in Portuguese
Nitretação por plasma contínuo e pulsado dos aços DIN X50 CrVMo 51 e DIN 34 CrAlNi7
Keywords in Portuguese
Abrasão
DIN X50 CrVMo 51
Nitralloy
Nitretação
Plasma
Abstract in Portuguese
A nitretação por plasma, ao aumentar as durezas superficiais dos aços, amplia sua faixa de utilização, bem como a vida útil dos componentes produzidos com os mesmos. A disponibilidade de dados técnicos relativos ao tratamento de nitretação bem como ao comportamento das camadas obtidas, frente ao desgaste, são fundamentais à aplicação correta desse tratamento. No presente trabalho foram avaliadas as resistências ao desgaste abrasivo, por meio de ensaios do tipo pino-disco, dos aços DIN X50 CrVMo 51 (~AISI H 13) e DIN 34 CrAlNi 7 (nitralloy) nitretados por plasma em condições variáveis de tempo, temperatura, tipo de corrente e frequência de pulso. As camadas obtidas avaliadas por meio de ensaios de microdureza,metalográficos e as fases presentes foram determinadas por meio de difração de raios-X. Os comportamentos quanto ao desgaste foram relacionados com esses resultados obtidos. No caso do AISI H 13 foi também estudada a possibilidade da realização do segundo revenido simultaneamente com a nitretação. Esse aço apresentou características de resistência ao desgaste superiores às do aço Nitralloy. O tratamento em que se utilizou o duplo revenido anteriormente à nitretação foi menos efetivo do que o realizado simultaneamente com a mesma. A melhor condição de resistência ao desgaste ocorreu no caso do aço AISI H13 nitretado durante 3 h a 500ºC com corrente pulsada de 10 kHz. A resistência declinou com a diminuição da frequência do pulso.
Title in English
Continuous and pulsed plasma nitriding of the steels DIN X50 CrVMo 51 and DIN 34 CrAlNi 7
Keywords in English
Abrasion
DIN X50 CrVMo 51
Nitralloy
Plasma nitriding
Abstract in English
The plasma nitriding, increasing the surface hardness of the steels, enlarges their use, as well as the useful life of the components produced with them. The readiness of relative technical data of the nitriding treatment as well as to the behavior of the obtained layers, with respect to the wear, are fundamental to the correct application of that treatment. In the present work the resistances of the abrasive wear they were evaluated, by means of the pin-on-disk test, of the steels DIN X50 CrVMo 51 (~AISI H13) and DIN 34 CrAINi 7 (Nitralloy) plasma nitrided in variable conditions of time, temperature, electrical current type and pulse frequency. The obtained layers were evaluated by means of microhardness and metalographic tests and the present phases were determined by means of R-X difraction. The behaviors with regards to the wear were related to those obtained results. In the case of AISI H13 steel was also studied the possibility of the simultaneously accomplishment of the second tempering with the nitriding. That steel presented resistance characteristics to the wear superiors to the on of the Nitralloy steel. The treatment in that the double tempering was used previously to the nitriding it was less effective than accomplished it simultaneously with the same. The best resistance condition to the wear happened in the case of the nitrided AISI H13 steel during 3:00 hours at 500°C with pulsed current of 10 kHz. The resistance decreased in a direct relation with the frequency of the pulse.
 
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Publishing Date
2016-09-15
 
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