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Research Papers: Mixed and Boundary Lubrication

Effect of Surface Nanocrystallization Pretreatment on the Tribological Properties of Plasma Nitrided AISI 316 L Stainless Steel Under Boundary Lubrication

[+] Author and Article Information
Yanyan Wang

School of Engineering and Technology,
China University of Geosciences (Beijing),
Beijing 100083, China

Wen Yue, Lina Zhu, Zhiqiang Fu, Chengbiao Wang

School of Engineering and Technology,
China University of Geosciences (Beijing),
Beijing 100083, China;
National International Joint Research Center of
Deep Geodrilling Equipment,
Beijing 100083, China

Jiajie Kang

School of Engineering and Technology,
China University of Geosciences (Beijing),
Beijing 100083, China;
National International Joint Research Center of
Deep Geodrilling Equipment,
Beijing 100083, China
e-mail: kangjiajie@cugb.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 16, 2018; final manuscript received December 16, 2018; published online January 25, 2019. Assoc. Editor: Satish V. Kailas.

J. Tribol 141(4), 042102 (Jan 25, 2019) (8 pages) Paper No: TRIB-18-1433; doi: 10.1115/1.4042392 History: Received October 16, 2018; Revised December 16, 2018

It has been proved that surface nanocrstallization pretreatment is beneficial to plasma nitriding of steel by enhancing nitrogen diffusion, while the tribological properties of the nitrided nanostructured steel under boundary lubrication are not clear. In this work, AISI 316 L stainless steel with and without ultrasonic cold forging technology (UCFT) pretreatment was plasma nitrided at 500 °C for 4 h. The effects of UCFT pretreatment on the microstructure and properties of the nitrided layer and the tribochemical interactions between the nitrided layer and friction modifier molybdenum dithiocarbamate (MoDTC) and antiwear additive zinc dialkyldithio-phosphate (ZDDP) were investigated using SRV tribometer, scanning electron microscopy (SEM), vickers hardness tester, optical microscope, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Surface analyses confirm the formation of a 20 μm thick nitrided layer on the UCFT-pretreated sample and it had higher hardness than that on the unpretreated sample. Furthermore, the nitrided UCFT-pretreated sample presented better synergetic effect with MoDTC and ZDDP on tribological behaviors than the nitrided unpretreated sample. This is attributed to the higher contents of Mo, S, Zn, P, and MoS2/MoO3 ratio in the tribofilms on the nitrided UCFT-pretreated sample.

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Figures

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Fig. 1

Schematic of SRV reciprocating apparatus

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Fig. 2

SEM surface morphologies of (a) N316 L sample and (b) NU316 L sample

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Fig. 3

Optical cross-sectional morphologies of (a) N316 L sample and (b) NU316 L sample

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Fig. 4

XRD patterns of N316 L sample and NU316 L sample

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Fig. 5

Microhardness variation along the depth of the samples

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Fig. 6

COF for samples tested under different lubricants

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Fig. 7

Wear rates of the samples and the counter balls tested under different lubricants

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Fig. 8

SEM micrographs of the worn surfaces tested under different lubricants: (a) N316 L, PAO4; (b) NU316 L, PAO4; (c) N316 L, PAO4 + MoDTC; (d) NU316 L PAO4 + MoDTC; (e) N316 L, PAO4 + ZDDP; and (f) NU316 L, PAO4+ZDDP

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Fig. 9

Contents of elements on the worn surfaces under PAO4+MoDTC lubricant

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Fig. 10

XPS spectra of Mo3d obtained from MoDTC tribofilms on the worn surfaces

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Fig. 11

Contents of elements on the worn surfaces under PAO4+ZDDP lubricant

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Fig. 12

XPS spectra of (a) Zn 2p, (b) P 2p, (c) O 1 s, and (d) N 1 s obtained from ZDDP tribofilms on the worn surfaces

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