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Research Papers: Friction and Wear

Tribological Characterization of N 80A and 21-4N Valve Materials Against GGG-40 Seat Material Under Dry Sliding Conditions at Temperatures Up To 500 °C

[+] Author and Article Information
Sheikh Shahid Saleem

Tribology Laboratory,
Department of Mechanical Engineering,
National Institute of Technology Srinagar,
Hazratbal,
Srinagar 190006, Jammu and Kashmir, India
e-mail: shahid@nitsri.net

M. F. Wani

Tribology Laboratory,
Department of Mechanical Engineering,
National Institute of Technology Srinagar,
Hazratbal,
Srinagar 190006, Jammu and Kashmir, India
e-mail: mfwani@nitsri.net

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 22, 2016; final manuscript received February 27, 2017; published online June 30, 2017. Assoc. Editor: Nuria Espallargas.

J. Tribol 139(6), 061605 (Jun 30, 2017) (20 pages) Paper No: TRIB-16-1334; doi: 10.1115/1.4036273 History: Received October 22, 2016; Revised February 27, 2017

Friction and wear studies of Nimonic 80A and 21-4N valve materials against GGG-40 under dry sliding conditions, at temperatures ranging from 50 °C to 500 °C, are presented in this paper. Friction coefficient was found to be continuously decreased with time for all tests with prominent running-in behavior seen in the 50 °C and 500 °C tests. Higher friction coefficient and wear were observed at 300 °C as compared to those at 50 °C and 500 °C. Formation of oxide Fe3O4, at 300 °C, was confirmed by Raman spectroscopy, which resulted in a higher friction coefficient and wear. Raman spectroscopy further revealed the presence of α-Fe2O3, hematite, in most cases, with the presence of oxides of Ni–Cr and Ni–Fe as well. Energy dispersive spectroscopy (EDS) results on the samples confirmed the same. Wear at 500 °C was found to be the least for both the valve materials with scanning electron microscopy (SEM) confirming the formation of well-developed glaze layers.

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Figures

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Fig. 1

Photograph of the polished pin and disk specimen

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Fig. 2

SEM and optical micrographs of the pin and disk samples: (a) SEM micrograph of N 80A pin material, (b) SEM micrograph of 21-4N pin material, (c) optical micrograph of SG iron, GGG-40, and (d) SEM micrograph of graphite nodule, GGG-40

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Fig. 3

Three-dimensional surface profilometer

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Fig. 4

Schematic illustration of high temperature tribometer

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Fig. 5

Friction behavior for tribopair N 80A pin/GGG-40 disk and 21-4N pin/GGG-40 disk

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Fig. 6

Wear loss for N 80A and 21-4N pins and GGG-40 disk

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Fig. 7

Raman spectra at 50 °C of (a) scar on N 80A pin (b) wear track on GGG-40 disk

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Fig. 8

Raman spectra at 50 °C of (a) scar on 21-4N pin (b) wear track on GGG-40 disk

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Fig. 10

Raman spectra at 300 °C of (a) scar on 21-4N pin (b) wear track on GGG-40 disk

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Fig. 9

Raman spectra at 300 °C of (a) scar on N 80A pin (b) wear track on GGG-40 disk

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Fig. 11

Raman spectra at 500 °C of (a) scar on N 80A pin (b) wear track on GGG-40 disk

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Fig. 12

Raman spectra at 500 °C of (a) scar on 21-4N pin (b) wear track on GGG-40 disk

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Fig. 13

Optical micrograph, SEM image, and EDS of wear track on N 80A pin at 50 °C

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Fig. 14

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with N 80A pin, at 50 °C

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Fig. 15

Optical micrograph, SEM image, and EDS of wear track on 21-4N pin at 50 °C

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Fig. 16

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with 21-4N pin, at 50 °C

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Fig. 17

Optical micrograph, SEM image, and EDS of wear track on N 80A pin at 300 °C

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Fig. 18

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with N 80A pin, at 300 °C

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Fig. 19

Optical micrograph, SEM image, and EDS of wear track on 21-4N pin at 300 °C

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Fig. 20

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with 21-4N pin, at 300 °C

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Fig. 21

Optical micrograph, SEM image, and EDS of wear track on N 80A pin at 500 °C

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Fig. 22

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with N 80A pin, at 500 °C

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Fig. 23

Optical micrograph, SEM image, and EDS of wear track on 21-4N pin at 500 °C

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Fig. 24

Optical micrograph, SEM image, and EDS of wear track on GGG-40 disk, with 21-4N pin, at 500 °C

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