DESGASTE E ATRITO DA CAMADA NITRETADA DO AÇO ABNT H13 NITRETADO POR PLASMA PULSADO

ABNT H13 tool steel discs were nitrided by pulsed plasma in an atmosphere 20% N2 and 80% H2 at a temperature of 400ºC in different times: 1 h, 4 h, 9 h, 16 h and 36 h. The discs were tested in a tribometer in order to study the sliding wear of the nitrided material. A sphere of Si3N4 with a diameter...

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Bibliographic Details
Published in:Tecnologia em metalurgia, materiais e mineração materiais e mineração, 2009-10, Vol.6 (2), p.67
Main Authors: Leite, Mario Vitor, Figueroa, Carlos Alejandro, Baumvol, Israel Jacob R, Basso, Rodrigo Leonardo de O, Mei, Paulo Roberto, Sinatora, Amilton
Format: Article
Language:Portuguese
Subjects:
Alloys
Correlation
Deformation mechanisms
Deformation wear
Disks
Frictional wear
Microstructure
Nitriding
Plasmas (physics)
Plastic deformation
Silicon nitride
Sliding friction
Spalling
Tool steels
Wear mechanisms
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Summary:ABNT H13 tool steel discs were nitrided by pulsed plasma in an atmosphere 20% N2 and 80% H2 at a temperature of 400ºC in different times: 1 h, 4 h, 9 h, 16 h and 36 h. The discs were tested in a tribometer in order to study the sliding wear of the nitrided material. A sphere of Si3N4 with a diameter of 7.14 mm was used. A normal load of 800 N was applied. The discs slid under the sphere without lubricant for 8 h at a sliding speed of 0.05 ms-1 up to reach a total distance of 1.440 m. The results show that longer nitriding times reduce the volume of wear. The following wear mechanisms are observed: plastic deformation, ploughing and spalling. These mechanisms are correlated to the microstructure of the nitrided layer. The friction coefficient is 0.2 for all tested conditions.
ISSN:2176-1515
2176-1523
DOI:10.4322/tmm.00602001