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A study on graphite extrusion phenomenon under the sliding wear response of cast iron using microindentation and microscratch techniques
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.ORCID iD: 0000-0003-2698-5445
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
2014 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 320, no 1-2, 120-126 p.Article in journal (Refereed) Published
Abstract [en]

This 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 self-lubricating and the extrusion behaviour of the lamellar graphite as a result of indentation.

Place, publisher, year, edition, pages
Lausanne: Elsevier, 2014. Vol. 320, no 1-2, 120-126 p.
Keyword [en]
Lamellar graphite iron; Graphite extrusion; Sliding wear; Abrasive wear; Microindentation testing; Microscratch testing
National Category
URN: urn:nbn:se:hj:diva-24779DOI: 10.1016/j.wear.2014.09.002ISI: 000345156400015ScopusID: 2-s2.0-84907556394OAI: diva2:748681
EU, FP7, Seventh Framework Programme, 265861
Available from: 2014-09-21 Created: 2014-09-21 Last updated: 2015-10-13Bibliographically approved

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