Estudo do comportamento do coeficiente de desgaste e dos modos de desgaste abrasivo em ensaios de desgaste micro-abrasivo.

Cozza, Ronaldo Câmara

doi:10.11606/d.3.2006.tde-31032008-101929

Cited by 16 publications

(25 citation statements)

References 9 publications

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“…The effect of oxidative wear in the test under the 8.3-N load in this study could be confirmed by constructing curves of the wear rate under the contact load to illustrate the wear transition that has been described by Cozza [12]. Further tests under different loads should be performed in a future study for this purpose.…”

Section: Wear Tests On the Base Materialssupporting

confidence: 66%

“…The combination of the application of high loads under insufficient lubrication can cause severe adhesive wear on the surface of sliding metallic components. This damage is characterised by the presence of macroscopically visible fragments that adhere onto the two contact surfaces 12 . In our case, metal particles adhered to the respective sphere, which increased the severity of the wear on the material and left a wear track on the sphere.…”

Section: Methodsmentioning

confidence: 99%

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Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel

Neto

Silva

et al. 2016

Mat. Res.

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Super duplex stainless steels (SDSS) have high corrosion resistance because of their high contents of chromium, nickel, molybdenum and nitrogen but low wear resistance. To improve the wear resistance of these steels without affecting their corrosion resistance, samples of SDSS were treated by plasma ion nitriding at temperatures ranging from 350 °C to 570 °C for two hours. This thermochemical treatment resulted in the formation of different types of nitrides that affected the microhardness, the microwear behaviour and the corrosion resistance of the metal surface. The microwear resistance decreased at 400 °C because different nitrides formed on the surface, thereby increasing the hardness and volume wear resistance of the steel. The test results showed that the alloys that were nitrided at 400 °C and 450 °C exhibited the highest corrosion resistance to a solution medium containing chloride ions.

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Section: Wear Tests On the Base Materialssupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel

Neto

Silva

et al. 2016

Mat. Res.

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“…It also can be seen that for smallest sliding distances, the k values exhibit a random behavior (transient wear regime). As described by Cozza [25], there is no fixed sliding distance for obtaining the steady-state wear, since this depends on the characteristics of the tribological system. Therefore, it is important to consider the effect of samples surface morphology (structure and composition) on the wear regime.…”

Section: Effect Of Abrasive Particle Sizementioning

confidence: 99%

Micro-Abrasive Wear Behaviour of Low-Temperature Plasma Carburized Aisi 420 Martensitic Stainless Steel

Scheuer¹,

Cardoso²,

Neves³

et al. 2017

Anais Do Congresso Anual Da ABM

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Experiments were carried out aiming to study the influence of micro-abrasive wear test variables and plasma treatment parameters, on the tribological characteristics of low-temperature plasma carburized AISI 420 steel. The first part of this study was conducted in order to evaluate the influence of abrasive particle size, normal load and counter body rotation speed on carburized sample wear behavior; and the second part was conducted in order to evaluate the treatment temperature and time effect on carburized samples wear behavior. Plasma carburizing treatments were performed at 8 and 12 h, for temperatures ranging from 350 to 500°C; and at constant temperatures of 400°C for times between 12 to 48h, and for 450°C for times of 4 to 16h. Micro-abrasive wear test were performed by mean of a calowear ballcratering equipment using a polished ball of AISI 52100 steel rotating at 80, 120 and 160 rpm, for sliding distances from 2.6 to 104.2 m. Alumina abrasive particles with sizes of 0.05, 0.3 and 1.0 m were employed. The normal loads applied on this study were 0.1, 0.3 and 0.5 N. Carburized sample was characterized by mean of OM, XRD and hardness measurements. Worn crater characteristics were evaluated by confocal laser microscopy. Results showed that the transient wear regime prevails along the outer layer length (composed by Fe3C and 'C), and the steady-state wear stabilizes in the diffusion layer region (composed by 'C). It was verified that the wear rate and wear coefficient decreases with treatment temperature in the range of 350-450°C and increase for 500°C. It was also verified that the wear rate and wear coefficient decreases with treatment time in the range of 12-36 h (for 400°C cycle) and 4-12 h (for 450°C cycle), and increase for larger treatment times due the chromium carbide precipitation. It was also found that the wear coefficient increases with the increase of abrasive particle size, and decrease with the increase in counter body rotation speed and normal load. Lastly, the analysis of the worn craters indicates the occurrence of grooving and micro-rolling abrasion wear mechanisms.

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“…Pode-se verificar a existência de muitos dispositivos de micro desgaste por abrasão disponíveis nos principais centros de pesquisa do país [10,11,12,13,14,15,16].…”

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Desenvolvimento de dispositivo e estudo do comportamento ao microdesgaste abrasivo do aço AISI 420 temperado e revenido

et al. 2015

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O objetivo deste trabalho é a construção de um dispositivo para a realização de ensaios de micro desgaste abrasivo por esfera fixa. O contato abrasivo é realizado por uma esfera de aço AISI 52100, a qual é presa num eixo que gira com grande precisão, com ajuda de um motor, em relação a uma amostra plana que se manterá estacionária. A carga normal de ensaio é aplicada através de ajustes de peso no suporte pivotado do corpo de prova, a qual pode ser variada a cada ensaio realizado. Este dispositivo foi utilizado para a determinação da resistência ao desgaste abrasivo e da eficácia de tratamentos de superfície utilizados em peças que sofrem este tipo de solicitação em serviço, além de utilizá-lo para estudar novos produtos desenvolvidos para o aumento de resistência ao desgaste de superfícies. Foi avaliada a resistência ao microdesgaste abrasivo de aço AISI 420 temperado e revenido. Observou-se que o aumento da dureza do material tratado aumentou a resistência ao desgaste abrasivo quando comparado com o material sem tratamento térmico.Palavras-chave: desgaste microabrasivo, esfera fixa, aço AISI 420, configuração experimental. ABSTRACTThe abrasive microwear testing has been the subject of a significant amount of research in recent years, when its potential to evaluate the behaviour of thin coating became relevant. The aim of this work is to build a apparatus for abrasive microwear testing by rotating sphere. The abrasive contact is performed by a AISI 52100 steel ball which rotates, with great accuracy with the help of an electric motor, in relation to a flat sample that will remain stationary. The normal load is applied by weight adjustments in the support of the test specimen, which can be varied for each performed test. This device was used to determine the abrasive wear resistance and effectiveness of surface treatments used in parts that undergo this kind of requirement in service, and also for studying new products developed for increasing the wear resistance of surfaces. The microwear resistance of the quenched and tempered AISI 420 steel was evaluated. It was observed that increasing the hardness of the treated material produced an increased wear resistance when compared with untreated material Keywords: microabrasive wear, rotating sphere, stainless steel AISI 420, experimental setup. INTRODUÇÃOA palavra tribologia, derivada do grego, significa estudo do atrito, sendo a ciência e tecnologia que estuda a Matéria, v.20, n.2, pp. 304 -315, 2015.

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Estudo do comportamento do coeficiente de desgaste e dos modos de desgaste abrasivo em ensaios de desgaste micro-abrasivo.

Cited by 16 publications

References 9 publications

Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel

Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel

Micro-Abrasive Wear Behaviour of Low-Temperature Plasma Carburized Aisi 420 Martensitic Stainless Steel

Desenvolvimento de dispositivo e estudo do comportamento ao microdesgaste abrasivo do aço AISI 420 temperado e revenido

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