Effects of laser peening on residual stresses and fatigue crack growth properties of Ti–6Al–4V titanium alloy

Zhou, Jing; Huang, Shu; Zuo, Lisheng; Meng, Xiankai; Sheng, Jie; Tian, Qiong; Han, Yuanfei; Zhu, Weijun

doi:10.1016/j.optlaseng.2013.06.011

Cited by 76 publications

(16 citation statements)

References 22 publications

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“…The investigations showed that temperature has an important influence on the flow stress of metal materials, mainly includes the following aspects [1][2][3][4][5] 1. Dislocation motion: The increase of temperature enhances the thermal activation, and the concentration of vacancy defects reduces in the crystalline grain.…”

Section: Introductionmentioning

confidence: 99%

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

Lu¹,

Yang²,

Zhao³

et al. 2020

Preprint

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Laser shock peening as an innovative surface treatment technology can effectively improve the fatigue life, sur-face hardness, corrosion resistance, and residual compressive stress. Compared with the laser shock peening, the warm laser shock peening (WLSP) is a new surface treatment technology to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and micro-structure strengthening, results in more stable distribution of the residual compressive stress under heating and cyclic loading process. In this paper, the microstructure of GH4169 nickel super-alloy processed by WLSP technology with differ-ent laser parameters were investigated. The proliferation and tangling of dislocations in GH4169 were observed and the dislocation density increased after WLSP treatment. The influences of different treatment by LSP and WLSP on the microhardness distribution of the surface and along cross-sectional depth were investi-gated. The microstructure evolution of the GH4169 alloy being shocked with WLSP were studied by TEM. The effect of temperature on the stability of high temperature microstructure and properties of GH4169 alloy WLP was investigated.

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Section: Introductionmentioning

confidence: 99%

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

Lu¹,

Yang²,

Zhao³

et al. 2020

Preprint

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“…However, a serious weakness with titanium alloys is that owing to their sensitivity to stress concentration, fatigue fractures often occur in service [3]. To improve the stress field condition and prolong the fatigue life of titanium alloys, many surface strength technologies are put forward, such as shot peening (SP) [4], deep rolling (DR) [5], and laser shock peening (LSP) [6,7,8]. Of these, LSP technology has become a hot topic in the field of surface modification.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Pan

Zhou

et al. 2019

Materials

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In this paper, the effect of residual stress on the stress–life (S–N) curve and fracture morphology characteristics of Ti6Al4V titanium alloy after laser shock peening (LSP) without protective coating was experimentally investigated. The fatigue test and residual stress measurement were conducted on specimens before and after the LSP process. It was shown that LSP produced a high-amplitude compressive residual stress field on the surface of the specimen. After the LSP process, the fatigue life limit was increased by 16%, and the S–N curve shifted upward. Then, based on the theory of mean stress, the mechanism whereby the compressive residual stress improves the fatigue life of Ti6Al4V titanium alloy was analyzed. It indicated the improvement in fatigue life was because of the high-amplitude compressive residual stress on the surface and in depth induced by LSP to reduce the tensile stress produced by external loading. In addition, the scanning electron microscope (SEM) pattern of fatigue fracture demonstrated distinct differences in the fracture morphology before and after LSP. After LSP, the crack initiation sites of the samples moved to the subsurface where it was difficult for fatigue cracks initiating here. Moreover, after the LSP process, there were high density of fatigue striations and many secondary cracks on the fracture of the treated specimen.

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“…In addition, carburizing, nitriding and shot peening are applied when bending and twisting are anticipated, because these processes increase surface fatigue resistance [4][5][6][7][8][9][10]. It is well known that shot peening leads to an elevated surface hardness in conjunction with a high degree of compressive residual stress on the surface of the material, both of which improve fatigue strength [11][12][13][14]. There are many different peening techniques, including shot, micro shot, ultrasonic shot, laser, water jet, oil jet and hammer peening.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface compressive residual stress introduced by surface treatment on fatigue properties of metallic material

et al. 2018

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Abstract. This study considers shakedown in evaluating the fatigue limit of metals with compressive residual stress at the surface. We begin by applying tension-compression fatigue tests to ASTM CA6NM under conditions of controlled load and displacement to obtain fatigue limit diagram in compressive mean stress. The results imply that shakedown occurs under the condition of controlled displacement, therefore, shakedown should be considered when evaluating the fatigue limit of metals with compressive residual stress at the surface.

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Effects of laser peening on residual stresses and fatigue crack growth properties of Ti–6Al–4V titanium alloy

Cited by 76 publications

References 22 publications

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

Impact on Mechanical Properties and Microstructural Response of Nickel-Based Super-Alloy GH4169 Subjected to Warm Laser Shock Peening

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Effect of surface compressive residual stress introduced by surface treatment on fatigue properties of metallic material

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