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Research Papers: Coatings and Solid Lubricants

Effects of Microstructure of Compacted Graphite Iron in Tribological Strategy

[+] Author and Article Information
Arnaud Duchosal

Laboratoire de Mécanique Gabriel Lamé,
Université de Tours,
Université d'Orléans,
INSA Centre Val de Loire,
7 Avenue Marcel Dassault,
Tours 37200, France
e-mail: arnaud.duchosal@univ-tours.fr

Damien Joly

Sandvik Coromant,
Rue Henri Garih,
Fondettes 37230, France
e-mail: damien.joly@sandvik.com

René Leroy

Laboratoire de Mécanique Gabriel Lamé,
Université de Tours,
Université d'Orléans,
INSA Centre Val de Loire,
7 Avenue Marcel Dassault,
Tours 37200, France
e-mail: rene.leroy@univ-tours.fr

Roger Serra

Laboratoire de Mécanique Gabriel Lamé,
INSA Centre Val de Loire,
Université d'Orléans,
Université de Tours Laboratoire de Mécanique
Gabriel Lamé,
3 Rue de la Chocolaterie,
Blois 41000, France
e-mail: roger.serra@insa-cvl.fr

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 22, 2017; final manuscript received March 6, 2018; published online April 30, 2018. Assoc. Editor: Min Zou.

J. Tribol 140(5), 051302 (Apr 30, 2018) (8 pages) Paper No: TRIB-17-1493; doi: 10.1115/1.4039722 History: Received December 22, 2017; Revised March 06, 2018

In this paper, the effect of compacted graphite iron (CGI) microstructure has been investigated in tribological strategy. From industrial context, two coatings have been chosen: a single layer coating (physical vapor deposition (PVD)) and a multilayer coating (chemical vapor deposition (CVD)). Pin-on-disk tests have been done to analyze wear mechanisms and to directly obtain the coefficient of friction. Rotation speed of the disk has been adjusted to get the same linear velocity on different disk radii to get up to 150 m min−1 similar to machining condition. Three-dimensional (3D) profilometer, scanning electron microscopy, and nano-indentation were used to observe the track profiles, the pin, and the disk wears and to measure the hardness of microstructure components, respectively. Results showed that PVD coating was more abrasive and had more volume of sticking materials. Chemical vapor deposition coating, which could be the most appropriate for machining CGI, has a real antisticking property and has less friction coefficient than PVD coating. But the presence of small TiCN precipitates in CGI material has a proven negative effect in CVD coating lifetime.

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References

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Figures

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Fig. 1

Illustration in a transverse section of: (a) CVD and (b) PVD coatings from the different substrates

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Fig. 2

Illustration of the pin-on-disk tribology experiment with the tracks at radii 18 mm and 20 mm and the areas of analysis a, b, and c

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Fig. 3

Friction coefficient behavior during 3000 m for 563SG (CVD coating) and 479PE (PVD coating) on radii 18 mm and 20 mm on disk 1 (upper diagrams) and on disk 2 (lower diagrams)

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Fig. 4

Track profiles on CGI after 3000 m of friction for 563SG (CVD coating) and 479PE (PVD coating) on radii 18 mm and 20 mm on disk 1 (upper diagrams) and on disk 2 (lower diagrams)

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Fig. 5

SEM micrographs of: (a) the wear tracks and (b) the 479PE (PVD) pin on disk 1 R18

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Fig. 6

SEM micrographs of: (a) the wear tracks and (b) the 563SG (CVD) pin on disk 2 R18

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Fig. 7

SEM micrographs of: (a) the wear tracks and (b) the 563SG (CVD) pin on disk 1 R18

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Fig. 8

SEM micrographs of: (a) the wear tracks and (b) the 563SG (CVD) pin on disk 1 R20

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Fig. 9

Representation of theoretical versus measured volume of removed material for CVD (563SG) PVD (479PE) coatings at disk 1 and 2 and radii 18 mm and 20 mm

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Fig. 10

SEM observation and micro analysis of the cubic titanium carbonitride precipitates

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