Laser shock processing and its effects on microstructure and properties of metal alloys: a review

Montross, C. S.; Wei, Tao; Ye, Lin; Clark, Graham; Mai, Yiu‐Wing

doi:10.1016/s0142-1123(02)00022-1

Cited by 939 publications

(399 citation statements)

References 53 publications

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“…Laser shock peening (LSP) is an advanced surface treatment technique that has been successfully applied to improve the wear resistance and impact performance of metallic components [1][2][3]. During an LSP process, a shock wave with high-amplitude pressure is generated and propagates into the target material through the interaction of a high-power density pulsed laser and a thin absorption layer on the target surface.…”

Section: Introductionmentioning

confidence: 99%

“…It was found by Yasnii et al [4] that the impact toughness of 15Kh13MF steel increases up to twofold after LSP with a power density ranging from 5 × 10 8 to 2 × 10 9 W · cm −2 . The mechanism of the increase of impact toughness is mainly from two aspects: residual stresses and dislocations in the hardened layer [1,[5][6][7][8][9]. Prefabricated residual compressive stress can improve the stress threshold of crack growth.…”

Section: Introductionmentioning

confidence: 99%

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Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening

Xia

Yan

et al. 2015

Acta Mech. Sin.

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Laser shock peening (LSP) is a widely used surface treatment technique that can effectively improve the fatigue life and impact toughness of metal parts. Cr5Mo1V steel exhibits a gradient hardened layer after a LSP process. A new method is proposed to estimate the impact toughness that considers the changing mechanical properties in the gradient hardened layer. Assuming a linearly gradient distribution of impact toughness, the parameters controlling the impact toughness of the gradient hardened layer were given. The influences of laser power densities and the number of laser shots on the impact toughness were investigated. The impact toughness of the laser peened layer improves compared with an untreated specimen, and the impact toughness increases with the laser power densities and decreases with the number of laser shots. Through the fracture morphology analysis by a scanning electron microscope, we established that the Cr5Mo1V steel was fractured by the cleavage fracture mechanism combined with a few dimples. The increase in the impact toughness of the material after LSP is observed because of the decreased dimension and increased fraction of the cleavage fracture in the gradient hardened layer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening

Xia

Yan

et al. 2015

Acta Mech. Sin.

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“…Laser-induced plasma shock waves produce residual compressive stress causing plastic deformation in the target [4]. The LSP can improve metal properties such as surface hardness, abrasion durability, corrosion resistance, and fatigue strength [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Square Beam Energy Efficiency of a Homogenizer Near the Target for Laser Shock Peening

Kim

Hwang

Hong

et al. 2016

Journal of the Optical Society of Korea

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We analyzed through numerical simulations the properties of a square beam homogenizer near the target for laser shock peening. The efficiency was calculated near the target by considering the plasma threshold of the metals. We defined the depth of focus of the square beam homogenizer with a given efficiency near the target. Then, we found the relationship between the depth of focus for the laser shock peening and four main parameters of the square beam homogenizer: the plasma threshold of the metal, the number of lenslets in the array-lens, the focal length of the condenser lens and the input beam size.

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“…The formation of DIM is associated with highly dense twinning and gives rise a work hardened layer and compressive residual stress that may enhance fatigue performance [25,27].…”

Section: Introductionmentioning

confidence: 99%

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

Dunne

Roche

Twomey

et al. 2015

Shap. Mem. Superelasticity

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This work investigates the deposition of polytetrafluoroethylene (PTFE) onto a superelastic NiTi wire using an ambient temperature-coating technique known as CoBlast. The process utilises a stream of abrasive (Al 2 O 3 ) and a coating medium (PTFE) sprayed simultaneously at the surface of the substrate. Superelastic NiTi wire is used in guidewire applications, and PTFE coatings are commonly applied to reduce damage to vessel walls during insertion and removal, and to aid in accurate positioning by minimising the force required to advance, retract or rotate the wire. The CoBlast coated wires were compared to wire treated with PTFE only. The coated samples were examined using variety of techniques: X-ray diffraction (XRD), microscopy, surface roughness, wear testing and flexural tests. The CoBlast coated samples had an adherent coating with a significant resistance to wear compared to the samples coated with PTFE only. The XRD revealed that the process gave rise to a stress-induced martensite phase in the NiTi which may enhance mechanical properties. The study indicates that the CoBlast process can be used to deposit thin adherent coatings of PTFE onto the surface of superelastic NiTi.

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Laser shock processing and its effects on microstructure and properties of metal alloys: a review

Cited by 939 publications

References 53 publications

Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening

Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening

Analysis of the Square Beam Energy Efficiency of a Homogenizer Near the Target for Laser Shock Peening

Blast Coating of Superelastic NiTi Wire with PTFE to Enhance Wear Properties

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