DESGASTE E ATRITO DA CAMADA NITRETADA DO AÇO ABNT H13 NITRETADO POR PLASMA PULSADO
WEAR AND FRICTION OF THE NITRIED LAYER OF AN ABNT H13 TOOL STEEL NITRIDED BY PULSED PLASMA
Leite, Mario Vitor; Figueroa, Carlos Alejandro; Baumvol, Israel Jacob R.; Basso, Rodrigo Leonardo de O.; Mei, Paulo Roberto; Sinatora, Amilton
http://dx.doi.org/10.4322/tmm.00602001
Tecnol. Metal. Mater. Min., vol.6, n2, p.67-72, 2009
Resumo
Discos de aço ABNT H13 foram nitretados por plasma pulsado numa atmosfera 20% N2 e 80% H2, à temperatura de 400ºC em diferentes tempos: 1 h, 4 h, 9 h, 16 h e 36 h. Estes discos foram testados num tribômetro para simular o desgaste por deslizamento. Para isto, foi utilizada uma esfera de Si3N4 de 7,14 mm de diâmetro e carga normal aplicada de 800 N. O disco deslizou sob a esfera sem a presença de um lubrificante por 8 h, à velocidade de 0,05 ms–1, totalizando uma distância de deslizamento de 1.440 m. Os resultados deste ensaio mostram que, quanto maior o tempo de nitretação, menor o volume de material desgastado. Os mecanismos de desgaste observados são: deformação plástica, sulcamento e lascamento e estão relacionados com as características microestruturais da camada nitretada. O coeficiente de atrito medido é de 0,2 para todas as condições testadas.
Palavras-chave
Nitretação por plasma, Desgaste por deslizamento, Atrito
Abstract
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.
Keywords
Plasma nitriding, Sliding, Friction.
References
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2 JOST, H. P. Tribology: origin and future. Wear, v. 136, n. 1, p. 1-17, Feb. 1990.
3 AMERICAN SOCIETY FOR METALS. Friction, lubrication and wear technology. In: _________. Metals handbook. 2. ed. Metals Park, Oh, 1992. v. 18, p. 942.
4 ZUM GAHR, K. H. Microstructure and wear of materials. New York: Elsevier, 1987.
5 ARCHARD, J. F. Contact and rubbing of flat surfaces. Journal of Applied Physics, v. 24, n. 8, p. 981-8, Aug. 1953.
6 AMERICAN SOCIETY FOR METALS. Heat treating. In: ________. Metals handbook. Metals Park, Oh, 1991. v. 4, p. 1012.
7 KARAMIS, M. B. An investigation of the properties and wear behaviour of plasma-nitrided hot-working steel (H13). Wear, v. 150, n. 1-2, p. 331-42, Oct. 1991.
8 DEVI, M. U.; CHAKRABORTY, T. Y.; MOHANTY, O. N. Wear behaviour of plasma nitrided tool steels. Surface and Coatings Technology, v. 116-9, n. 1, p. 212-21, Sept. 1999.
9 CORENGIA, P.; WALTHER, F.; YBARRA, G.; SOMMADOSSI, S.; CORBARI, R.; BROITMAN, E. Friction and rollingsliding wear of DC-Pulsed plasma nitride AISI 410 martensitic stainless steel. Wear, v. 260, n. 4-5, p. 479-85, Feb. 2006.
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11 SUN, Y.; BELL, T.; WOOD, G. Wear behaviour of plasma-nitrided martensitic stainless steel. Wear, v. 178, n. 1-2, p. 131-8, Nov. 1994.
12 SUH, N. P. An overview of the delamination theory of wear. Wear, v. 44, n. 1, p. 1-16, Aug. 1977.
13 BAYER, R. G. Wear analysis for engineers. New York: HNB, 2002.
14 KARAOGLU, S. Structural characterization and wear behaviour of plasma-nitrided AISI 5140 low alloy steel. Materials Characterization, v. 49, n. 4, p. 349-57, Nov. 2003.
15 HWANG, D. H.; KIM, D. E.; LEE, S. J. Influence of wear particle interaction in the sliding interface on friction of metals. Wear, v. 225-9, n. 1, p. 427-39, Apr. 1999.
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