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

Jia, Siyu; Qu, Shengguan; Hu, Xiongfeng; Lai, Fuqiang; Duan, Chenfeng; Li, Xiaoqiang

doi:10.1002/srin.202100250

Cited by 6 publications

(11 citation statements)

References 46 publications

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“…However, the coefficient of thermal expansion of this material is large, and the hardness cannot be improved by quenching, so it is not suitable for valve stem [1] . Therefore, to optimize valve performance and save costs, the valve stem will be designed with martensite alloy steel to prevent valve wear and fretting [2] , such as 4Cr9Si2 martensite alloy steel, but the conventional fusion welding technology is not suitable for martensite alloy welding [3] .…”

Section: Introductionmentioning

confidence: 99%

Research on the reliability of inertial friction welded joints between 21-4N and 4Cr9Si2

Deng,

Zhu,

Cui

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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The 21-4N austenitic steel and the 4Cr9Si2 martensite steel were joined successfully by using inertia friction. In the process of inertia friction, the 4Cr9Si2 matrix on the welding surface precipitates along the 21-4N austenite grain boundary, forming the "bite" effect, which promotes metallurgical bonding. The peak temperature of inertia friction welding interface can reach above 1487K, and recrystallization, element diffusion and grain refinement exist in the weld center zone. In the tensile test, the fracture of the welded sample is in the 21-4N shear deformation zone, the maximum tensile strength is 1057MPa, and the elongation is about 12.5%. The 21-4N and 4Cr9Si2 dissimilar metals can be welded by inertia friction welding to obtain a joint structure with excellent performance.

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Section: Introductionmentioning

confidence: 99%

Research on the reliability of inertial friction welded joints between 21-4N and 4Cr9Si2

Deng,

Zhu,

Cui

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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“…Recently, the number of studies exploring the effects of shot peening on the tribological properties of engineering materials has increased [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] since shot peening has the potential to improve the tribological properties of materials along with its well-known effect of enhancing the fatigue strength and service life of engineering materials. Shot peening modifies the surface and subsurface properties of materials via the repeated impact of high-velocity shots accelerated through a nozzle on their surfaces (e.g., hardness, residual stress, microstructural features) [14,15,31], which can also affect their tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Surface and Tribological Properties of Powder Metallurgical Cp-Ti Titanium Alloy Modified by Shot Peening

et al. 2023

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The present study reveals for the first time the dry sliding wear behavior of a powder metallurgical pure titanium alloy (Cp-Ti) modified by shot peening. Cp-Ti samples were manufactured via powder metallurgy, and then their surface and subsurface features were modified using a custom-made, fully automated shot-peening system. The texture isotropy rate and the highest orientation angle of the shot-peened samples were 71.5% and 36°, respectively. The Abbott curves of the shot-peened surfaces revealed that the most common areal roughness value was 5.177 μm, with a frequency of 8.1%. Shot-peened surfaces exhibited an ~20% lower wear rate than unpeened surfaces under dry sliding wear, whereas the coefficient of friction was the same for both surfaces. Micro-ploughing, micro-cutting, oxidation, and three-body abrasion wear mechanisms were observed on the shot-peened and unpeened surfaces. High resolution 3D surface topographies of worn unpeened and shot-peened surfaces revealed micro-scratches and inhomogeneities along wear tracks, which are indicative of three-body abrasion mechanisms during contact. In addition, vertical and horizontal microcracks were visible just beneath the wear track, suggesting a clear indication of plastic deformation during contact. The cross-sectional hardness maps of shot-peened samples revealed the formation of a work-hardened surface layer with shot peening, which improved the wear resistance. These findings support that shot peening can be a useful tool to modify the surface and tribological properties of powder metallurgical Cp-Ti alloys.

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“…Jia et al [10] performed shot peening with different parameters on 4Cr9Si2 martensitic engine valve steel at high temperatures and experimented with a pin-on-disk wear tester. The results showed that shot peening refined the top surface grains and generated a large number of dislocations.…”

Section: Introductionmentioning

confidence: 99%

Sliding Friction and Wear Properties of 40CrNiMo Steel after Laser Hardening against GCr15 Steel under Oil Lubrication

Yan

et al. 2022

Coatings

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40CrNiMo steel, which is a commonly used material for sprag clutch wedges, is widely used in practice, and the surface wear will seriously affect the performance of the product. In this study, the surface of 40CrNiMo steel was strengthened at two scanning speeds by laser hardening. After laser hardening, the surface hardness can reach the use requirement of the clutch wedge. By changing the speed and temperature, the friction and wear testing machine was used to study the wear behavior of 40CrNiMo steel after laser hardening against GCr15 steel under oil lubrication, the friction coefficient, wear amount and wear morphology under different conditions were analyzed. The results show that, at the normal temperature, with the increase in the sliding speed, the friction coefficient showed a gradually decreasing trend, the width of the wear surface of the steel increased, and the wear amount increased. The increase in temperature led to an increase in the friction coefficient and the fluctuation, wear width and wear amount of the hardened layer. At the temperature of 20 °C, abrasive wear was the main form of wear, and the furrow formed special channels for the lubricating oil to help reduce the friction coefficient under oil lubrication. At high temperatures, the depth of the furrow further increased, and the degree of adhesive wear and oxidative wear gradually increased. The research provides a reference for the application of material in the sprag clutch.

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

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/srin.202100250.

Cited by 6 publications

References 46 publications

Research on the reliability of inertial friction welded joints between 21-4N and 4Cr9Si2

Research on the reliability of inertial friction welded joints between 21-4N and 4Cr9Si2

Surface and Tribological Properties of Powder Metallurgical Cp-Ti Titanium Alloy Modified by Shot Peening

Sliding Friction and Wear Properties of 40CrNiMo Steel after Laser Hardening against GCr15 Steel under Oil Lubrication

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