Volume 92, Issue 11 2100250
Research Article

Effect of Shot Peening on Microstructures and High-Temperature Tribological Properties of 4Cr9Si2 Valve Steel

Siyu Jia

Siyu Jia

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640 China

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Shengguan Qu

Corresponding Author

Shengguan Qu

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640 China

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Xiongfeng Hu

Xiongfeng Hu

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640 China

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Fuqiang Lai

Fuqiang Lai

Engineering Research Center for Metal Rubber, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350116 China

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Chenfeng Duan

Chenfeng Duan

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640 China

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Xiaoqiang Li

Xiaoqiang Li

National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640 China

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First published: 07 August 2021
Citations: 4
Research data are not shared.

Abstract

Herein, shot peening (SP) using different parameters is performed on 4Cr9Si2 martensite engine valve steel at elevated temperatures. The microstructure of the modified layer is characterized via optical microscopy (OM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). High-temperature wear tests are performed under dry sliding conditions at 450 °C using a pin-on-disc wear tester, and the worn surface is evaluated via scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The results show that SP refines the grains on the top surface to 19.8 nm and yields numerous dislocations. Meanwhile, the compressive residual stress and microhardness of the treated surface increase to −575 MPa and 486.33 HV0.2, respectively. At elevated temperatures, the increase in hardness provides resistance to plastic deformation and improves the performance of the oxide film. Compared with an untreated sample, sample SP4 shows a 65.23% decrease in wear rate and its wear resistance improves significantly at elevated temperatures. In addition, the wear mechanisms of SP-treated samples are primarily oxidation wear and delamination.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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