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research-article

Effect of surface nanocrystallization pretreatment on the tribological properties of plasma nitrided AISI 316L stainless steel under boundary lubrication

[+] Author and Article Information
Yanyan Wang

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, PR China
wangyy6711@163.com

Wen Yue

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, PR China; National International Joint Research Center of Deep Geodrilling Equipment, Beijing, 100083, PR China
cugbyw@163.com

Jia-jie Kang

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

Lina Zhu

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, PR China; National International Joint Research Center of Deep Geodrilling Equipment, Beijing, 100083, PR China
zhulina@cugb.edu.cn

Zhiqiang Fu

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, PR China; National International Joint Research Center of Deep Geodrilling Equipment, Beijing, 100083, PR China
fuzq@cugb.edu.cn

Chengbiao Wang

School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, PR China; National International Joint Research Center of Deep Geodrilling Equipment, Beijing, 100083, PR China
cbwang@cugb.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042392 History: Received October 16, 2018; Revised December 16, 2018

Abstract

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 316L stainless steel with and without ultrasonic cold forging technology (UCFT) pretreatment was plasma nitrided at 500 ? for 4 h. The effects of UCFT pretreatment on the microstructure and properties of the nitrided layer and the tribochemical interactions between the nitirided layer and friction modifier MoDTC and antiwear additive ZDDP were investigated using SRV tribometer, scanning electron microscopy, vickers hardness tester, optical microscope, X-ray diffraction and X-ray photoelectron spectroscopy. Surface analyses confirm the formation of a 20 ┬Ám thick nitrided layer on the UCFT-pretreated sample and it had higher hardness than that on the un-pretreated sample. Furthermore, the nitrided UCFT-pretreated sample presented better synergetic effect with MoDTC and ZDDP on tribological behaviors than the nitrided un-pretreated 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.

Copyright (c) 2018 by ASME
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