Investigating the effects of microstructure on the wear mechanisms in lamellar cast irons via microscratch tests

Mendas, Mohammed; Benayoun, Stéphane

doi:10.1016/j.triboint.2013.07.009

Cited by 17 publications

(23 citation statements)

References 20 publications

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“…No metal chips, and cracks were observed at the bottom of the grooves. Moreover, the contribution of the hard phases in improving the wear resistance during scratching is well-discussed in literature [13]. This mechanism is illustrated by the SEM micrograph in Fig.…”

Section: Microscratch Testingmentioning

confidence: 70%

“…However, when the indenter penetrates deeper, through application of higher loads, it acts on a consistent volume of the material and thus the corresponding damage is more significant. The study performed by Mendas et al [13] indicated …”

Section: Microscratch Testingmentioning

confidence: 95%

“…The abrasive wear behaviour of lamellar irons has been studied, using scratch testing techniques, by Mendas et al [13]. They investigated the effect of microstructure, applied various loads and attack angles of conical indenter on coefficient of friction and wear characteristics.…”

mentioning

confidence: 99%

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A study on graphite extrusion phenomenon under the sliding wear response of cast iron using microindentation and microscratch techniques

Ghasemi

Elmquist

2014

Wear

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A study on graphite extrusion phenomenon under the sliding wear response of cast iron using microindentation and microscratch techniques. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis study focuses on the graphite flakes extrusion mechanism during microindenting and microscratching of cast iron. Observations on the graphite response under abrasive conditions revealed that the matrix deformation which is occurred during a sliding wear condition could have a significant influence on its lubricating performance. Simple microindentation and microscratch tests were conducted to explore the lamellar graphite contribution to tribofilm formation under abrasive wear conditions. The results obtained showed that induced plastic deformation which developed adjacent to the graphite compressed the lamellas and in turn resulting in extrusion of the graphite from its natural position. Further investigations on both indentation and scratch tests indicated that, surprisingly, the graphite began to be fractured and extruded from the centre of graphite lamellas, irrespective of the lamella size. Additionally, a mechanism was proposed to explain the selflubricating and the extrusion behaviour of the lamellar graphite as a result of indentation.

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Section: Microscratch Testingmentioning

confidence: 70%

Section: Microscratch Testingmentioning

confidence: 95%

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A study on graphite extrusion phenomenon under the sliding wear response of cast iron using microindentation and microscratch techniques

Ghasemi

Elmquist

2014

Wear

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“…Mendas e Benayoun [Mendas, 2013] Figura 2.34 Mecanismo de desgaste e comportamento da matriz em diferentes profundidades: a) sulco mais raso que a profundidade da grafita; b) sulco mais profundo que a grafita [Mendas, 2013] Figura 2.35 Influência da orientação do veio de grafita no mecanismo de desgaste [Mendas, 2013] Ghasemi e Elmquist realizaram ensaios com anéis de pistão com microestrutura perlítica e grafitas, retirados de um motor diesel marítimo [Ghasemi, 2014]. Foram feitos testes de micro-riscamento e micro-endentações, os primeiros com carga constante de 200 gf.…”

Section: Direção Do Movimento Risco Endentadorunclassified

“…Quanto ao COF, aqueles autores consideram que a subida do valor durante a travessia da grafita é provocada por formação de proa no endentador, não se detendo sobre o fato de haver um comportamento inteiramente distinto na saída da zona de grafita: enquanto no ensaio de 2,5 mN o COF tem um ligeiro aumento, no de 5 mN ele sofre uma queda brusca. Tanto no trabalho de Nakamura e Iwabuchi [Nakamura, 2012] como num posterior de Mendas e Benayoun [Mendas, 2013] essa queda é atribuída a um fenômeno de stick slip, sem que seja apresentada uma análise mais profunda do que ocorre. Segue transcrição literal do trecho do trabalho…”

Section: Relaçãounclassified