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Research Papers: Friction and Wear

Effect of Niobium on the Dry Sliding Friction and Wear Properties of 100Cr6 Bearing Steel

[+] Author and Article Information
He Guo-Ning, Zhou Ning-Bo, Zhang Chao-lei, Ba Xin-yu, Liu Ya-Zheng

School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 10, 2017; final manuscript received May 8, 2018; published online June 13, 2018. Assoc. Editor: Satish V. Kailas.

J. Tribol 140(6), 061608 (Jun 13, 2018) (7 pages) Paper No: TRIB-17-1432; doi: 10.1115/1.4040304 History: Received November 10, 2017; Revised May 08, 2018

In this work, the dry sliding friction and wear properties were studied by wear test for 100Cr6 bearing steel when Nb content was 0.018% and 0.040%. In addition, in order to explain the differences, the experimental samples were processed for spheroidizing annealed and the quenched-tempered microstructure and hardness was analyzed. The result indicated that their friction coefficient was decreased to 0.047 when Nb content was 0.018% and the worn surface is microcutting and spalling without plowing. When Nb content was 0.040%, the friction coefficient was decreased to 0.006 and maximum wear depth was the deepest owing to obvious cutting. In order to increase the properties of the friction and wearing, Nb content should be decreased. With Nb content increased, the properties of the friction and wearing are decreased. The incorporation of Nb into bearing steel promotes the formation of martensite and carbide particles, which results in the diversity of the wear behaviors, eventually.

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Figures

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Fig. 1

UMT-2 multifunctional friction and wear tester

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Fig. 2

Top and bottom sample morphology

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Fig. 3

Worn surface morphology: (a) Nb free, (b) low Nb, and (c) high Nb

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Fig. 4

Three-dimensional morphology: (a) Nb free, (b) low Nb, and (c) high Nb

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Fig. 5

Scanning electron microscope micrographs of wear morphology: ((a) and (d)) Nb free, ((b) and (e)) low Nb, ((c) and (f)) high Nb

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Fig. 6

Scanning electron microscope micrographs of wear debris: (a) Nb free, (b) low Nb, (c) high Nb

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Fig. 7

Friction coefficient with time

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Fig. 8

Displacement change along Z axis with time

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Fig. 9

Undulation of worn surface

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Fig. 10

Vickers hardness along vertical

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Fig. 11

Microstructure of spheroidizing annealed steel bars: (a) Nb free, (b) low Nb, and (c) high Nb

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Fig. 12

Carbide particles in the backscattering mode and energy spectrum results: (a) Nb free, (b) low Nb, and (c) high Nb

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Fig. 13

Scanning electron microscope micrographs of metallographic organization: (a) Nb free, (b) low Nb, and (c) high Nb

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Fig. 14

Hardness after heat treatment

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