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Open AccessArticle

Effect of Surface Densification on the Microstructure and Mechanical Properties of Powder Metallurgical Gears by Using a Surface Rolling Process

by Jingguang Peng 1,2, Yan Zhao 1, Di Chen 2, Kiade Li 2, Wei Lu 1,* and Biao Yan 1,*
1
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
2
Shanghai Automotive Powder Metallurgy Co. Ltd., Shanghai 201908, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Auezhan Amanov
Materials 2016, 9(10), 846; https://doi.org/10.3390/ma9100846
Received: 22 August 2016 / Revised: 25 September 2016 / Accepted: 14 October 2016 / Published: 19 October 2016
(This article belongs to the Special Issue Tribological Behavior of Materials by Surface Engineering)
Powder metallurgy (PM) components are widely used in the auto industry due to the advantage of net-shape forming, low cost, and high efficiency. Still, usage of PM components is limited in the auto industry when encountering rigorous situations, like heavy load, due to lower strength, hardness, wear resistance, and other properties compared to wrought components due to the existence of massive pores in the PM components. In this study, through combining the powder metallurgy process and rolling process, the pores in the PM components were decreased and a homogenous densified layer was formed on the surface, which resulted in the enhancement of the strength, hardness, wear resistance, and other properties, which can expand its range of application. In this paper, we study the impact of different rolling feeds on the performance of the components’ surfaces. We found that with the increase of the rolling feed, the depth of the densified layer increased. View Full-Text
Keywords: powder metallurgy; rolling; surface densification; wear resistance powder metallurgy; rolling; surface densification; wear resistance
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Peng, J.; Zhao, Y.; Chen, D.; Li, K.; Lu, W.; Yan, B. Effect of Surface Densification on the Microstructure and Mechanical Properties of Powder Metallurgical Gears by Using a Surface Rolling Process. Materials 2016, 9, 846.

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