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Doctoral Thesis
DOI
10.11606/T.3.2002.tde-07042010-111922
Document
Author
Full name
Giuseppe Pintaúde
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2002
Supervisor
Committee
Sinatora, Amilton (President)
Albertin, Eduardo
Hubler, Roberto
Mello, José Daniel Biasoli de
Tschiptschin, André Paulo
Title in Portuguese
Análise dos regimes moderado e severo de desgaste abrasivo utilizando ensaios instrumentados de dureza.
Keywords in Portuguese
Desgaste de materiais
Dureza de materiais
Tribologia
Abstract in Portuguese
Este trabalho apresenta uma metodologia experimental para investigar a relação entre taxas de desgaste abrasivo e dureza. Investigam-se os regimes moderado e severo de desgaste abrasivo em função da razão entre a dureza do abrasivo (HA) e a dureza do material desgastado (H). Foram realizados ensaios pino contra lixa, utilizando vidro como abrasivo em dois tamanhos, grana #80 e grana #240, e pinos com 3 mm de diâmetro sob força de 20 N. Os materiais ensaiados foram os aços AISI 1006 e AISI 52100, este último em diferentes condições metalúrgicas, e um ferro fundido branco de alto cromo, de composição eutética e matriz perlítica. Três tipos de resposta do sistema tribológico foram utilizadas para avaliar os regimes de desgaste: perda de massa, coeficiente de atrito e força de penetração do abrasivo. Determinaram-se as perdas de massa ao longo dos ensaios; o coeficiente de atrito medido por meio de célula de carga e a força de penetração com o uso de ensaios instrumentados de dureza estimando-se a profundidade máxima de penetração com base no parâmetro Rz. A partir das medidas de dureza, foi utilizado um parâmetro para incorporar os efeitos do comportamento elasto-plástico dos materiais, que considera a morfologia de impressão de dureza. Com este parâmetro, foi possível obter uma dureza denominada "verdadeira", que incorpora os efeitos de formação de bordas ou retração dos materiais. Verificou-se que os valores de resistência ao desgaste relativa não dependem do tamanho do abrasivo, mas que os valores de coeficiente de atrito dependem, sob regime severo de desgaste. Por sua vez, no regime moderado, os valores de coeficiente de atrito são independentes do tamanho do abrasivo.
Title in English
Analysis of mild and severe regimes of abrasive wear using instrumented hardness testing.
Keywords in English
Materials hardness
Tribology
Wear of materials
Abstract in English
This work presents an experimental methodology to investigate the relationship between abrasive wear rates and hardness. The mild and severe abrasive wear regimes are investigated in relation to the abrasive hardness-to-worn material hardness ratio (HA/H). Pin-against-paper tests were performed, using glass as abrasive material in two grain sizes, grit #80 and grit #240, and 3-mm diameter pins under 20 N of applied load. The tested materials were AISI 1006 e AISI 52100 steels, the last one in different metallurgical conditions, and a high-chromium white cast iron, with eutetic composition and pearlitic matrix. Three kinds of tribological system responses were used to evaluate the wear regimes: mass loss, friction coefficient and load of penetration of abrasive. Mass losses were determined along testing time; friction coefficient was determined by means of load cell and the load of penetration using instrumented hardness test, selecting the maximum depth penetration based on the Rz roughness parameter. From hardness measurements, a parameter was used to incorporate the elastic-plastic behavior of materials, which consider the indentation hardness morphology. Using this parameter, it was possible to obtain a kind of hardness called "true", which incorporate the pilling-up and sinking-in effects. It has been demonstrated that the relative abrasive resistance is not dependent of the abrasive particle size, but the friction coefficient values change, under severe wear regime. On the other hand, under mild regime, the friction coefficient values are independent of the abrasive particle size.
 
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Publishing Date
2010-05-20
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • PINTAUDE, G, TANAKA, D.K, and SINATORA, A. Effect of indentation size and microhardness calculation on abrasive wear severity [doi:10.1016/S1359-6462(00)00633-3]. Scripta Materialia [online], 2001, vol. 44, n. 4, p. 659-663.
  • PINTAUDE, G, TANAKA, D.K, and SINATORA, A. The effects of abrasive particle size on the sliding friction coefficient of steel using a spiral pin-on-disk apparatus [doi:10.1016/S0043-1648(03)00212-6]. Wear [online], 2003, vol. 255, n. -5, p. 55-59.
  • PINTAUDE, G., et al. Mild and severe wear of steels and cast irons in sliding abrasion [doi:10.1016/j.wear.2008.12.099]. Wear [online], 2009, vol. 267, n. -3, p. 19-25.
  • PINTAUDE, Giuseppe, et al. A review on the reverse analysis for the extraction of mechanical properties using instrumented Vickers indentation. International Journal of Materials Research [online], 2005, vol. 96, p. 1252-1255. [acesso ]. Disponível em : <http://www.ijmr.de/directlink.asp?MK101170>
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