Effect of laser shock peening on surface integrity and tensile fatigue behavior of TB8 bolts

Zhang, Yalong; Jian, Xingming; Xia, Feiyan; Shi, Dapeng; Wu, Luji; Liu, Le; Ji, Vincent

doi:10.1016/j.engfailanal.2024.107968

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…As has been shown in the previous sections, LSTH is a process that can increase the hardness of steels and other metallic alloys [79]. LSTH creates a surface layer significantly harder than the underlying material, resulting in improved mechanical properties such as increased wear resistance and fatigue strength [80]. The hardness improvement achieved through LSTH depends on several factors, including the specific material or alloy, the processing parameters, and the depth of the hardened layer.…”

Section: Microhardnessmentioning

confidence: 86%

Laser Surface Transformation Hardening for Automotive Metals: Recent Progress

Karamimoghadam,

Rezayat,

Moradi

et al. 2024

Metals

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This article discusses recent advancements in the Laser Surface Transformation Hardening (LSTH) process applied to industrial metals. It focuses on examining the microstructure of the metal surface layer and explores different methods of performing LSTH to evaluate mechanical and surface properties. The study also investigates the utilization of various industrial lasers and simulation software for the LSTH process. The careful analysis of heat transfer and temperature control during LSTH aims to prevent the generation of surface defects like micro-cracks and surface melting. Finite element method (FEM) software effectively simulates the LSTH process. The research provides a comprehensive overview of recent developments in LSTH, categorized based on different metals and subsequent testing, highlighting its applications in the automotive industry. Electrochemical, wear, and microhardness tests are investigated to assess the potential applications of automotive metals.

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Section: Microhardnessmentioning

confidence: 86%

Laser Surface Transformation Hardening for Automotive Metals: Recent Progress

Karamimoghadam,

Rezayat,

Moradi

et al. 2024

Metals

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show abstract

“…Figure 16b depicts the fatigue fracture surface after LSP. Both sides are affected by laser shock, resulting in the formation of high-density dislocations and finer grains on the material surface, which, to some extent, suppresses the initiation of surface cracks [27,28]. The crack source is driven from the hole corner surface to the middle of the hole wall.…”

Section: Macroscope Fractographymentioning

confidence: 99%

Investigation of Residual Stress Distribution and Fatigue of 7050-T7451 Alloy Hole Components with Laser Shock and Ultrasonic Extrusion

Jiang,

Liu,

Wang

et al. 2024

Metals

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Small-hole structures, such as the millions of fastener holes found on aircraft, are typical stress-concentration structures prone to fatigue failure. To further improve the strengthening process of this small-hole structure, we make up for the limitations of laser shock processing (LSP) of small holes by combining it with the ultrasonic extrusion strengthening (UES) process to form a new strengthening method—laser shock and ultrasonic extrusion strengthening (LUE). The influence of the LUE process sequence and process parameters on residual stress distribution was studied through FEM, and the gain of fatigue life of specimens after LUE strengthening was also explored through tests. The results show that when using LUE technology, the friction force decreases with the increase in amplitude and decreases by 3.2% when the amplitude is maximum. The LUE process eliminates the thickness effect generated by LSP, which can achieve good stress distribution of small-hole components under smaller laser shock peak pressure, and reduces equipment power. LUE can significantly improve the fatigue life of small-hole components, and the maximum fatigue life gain can be up to 310.66%.

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Optimized mechanical properties of the hot forged Ti–6Al–4V alloy by regulating multiscale microstructure via laser shock peening

Ouyang,

Zhang,

et al. 2024

International Journal of Machine Tools and Manufacture

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Effect of laser shock peening on surface integrity and tensile fatigue behavior of TB8 bolts

Cited by 4 publications

References 36 publications

Laser Surface Transformation Hardening for Automotive Metals: Recent Progress

Laser Surface Transformation Hardening for Automotive Metals: Recent Progress

Investigation of Residual Stress Distribution and Fatigue of 7050-T7451 Alloy Hole Components with Laser Shock and Ultrasonic Extrusion

Optimized mechanical properties of the hot forged Ti–6Al–4V alloy by regulating multiscale microstructure via laser shock peening

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