Effects of Laser Induced Shock Waves on Metals

Clauer, A. H.; Holbrook, John H.; Fairand, B. P.

doi:10.1007/978-1-4613-3219-0_38

Cited by 144 publications

(102 citation statements)

References 18 publications

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“…7 Impact toughness, a k1 , and the gradient, k, for different laser power densities and different numbers of laser shots: a different laser power densities and b different numbers of laser shots LSP. In Table 2, the surface hardness increases from 236.8 to 246.1 kg · mm −2 as the laser power density increases from 2.6 to 4.4 GW · cm −2 , which has the identical trend with the experimental results of Clauer and Fairand [27]. Clauer and Fairand [27] found that the average surface hardness of 2024-T351 increases with peak shock pressure while the peak pressure is proportional to the square root of laser power density.…”

Section: Impact Toughnesssupporting

confidence: 79%

“…In Table 2, the surface hardness increases from 236.8 to 246.1 kg · mm −2 as the laser power density increases from 2.6 to 4.4 GW · cm −2 , which has the identical trend with the experimental results of Clauer and Fairand [27]. Clauer and Fairand [27] found that the average surface hardness of 2024-T351 increases with peak shock pressure while the peak pressure is proportional to the square root of laser power density. The increase in the gradient can be ascribed to the fact that the increasing rate of impact toughness is higher than the increasing rate of the depth of the GHL according to Eq.…”

Section: Impact Toughnesssupporting

confidence: 79%

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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: Impact Toughnesssupporting

confidence: 79%

Section: Impact Toughnesssupporting

confidence: 79%

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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“…It has been shown that the residual stresses can be directly related to the fatigue life of samples [25,[27][28][29][31][32][33]37,38] with a clear beneficial effect of compressive stresses in the near surface region. It was also observed that the depth of the compressive residual stresses has a direct influence on the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Kalentics

Boillat

Peyre

et al. 2017

Additive Manufacturing

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Selective laser melting Laser shock peening 3D Laser shock peening Residual stress profile 15-5 PH stainless steel 316L stainless steel a b s t r a c t The paper describes a new approach in controlling and tailoring residual stress profile of parts made by Selective Laser Melting (SLM). SLM parts are well known for the high tensile stresses in the as -built state in the surface or subsurface region. These stresses have a detrimental effect on the mechanical properties and especially on the fatigue life. Laser Shock Peening (LSP) as a surface treatment method was applied on SLM parts and residual stress measurements with the hole -drilling method were performed. Two different grades of stainless steel were used: a martensitic 15-5 precipitation hardenable PH1 and an austenitic 316L. Different LSP parameters were used, varying laser energy, shot overlap, laser spot size and treatments with and without an ablative medium. For both materials the as-built (AB) residual stress state was changed to a more beneficial compressive state. The value and the depth of the compressive stress was analyzed and showed a clear dependence on the LSP processing parameters. Application of LSP on SLM parts showed promising results, and a novel method that would combine these two processes is proposed. The use of LSP during the building phase of SLM as a "3D LSP" method would possibly give the advantage of further increasing the depth and volume of compressive residual stresses, and selectively treating key areas of the part, thereby further increasing fatigue life.

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“…Although the dominant commercial market for laser glass is in large laser systems for inertial confinement fusion research with application to fusion energy and weapons physics science [56], these materials have also found their way into a number of industrial and laboratory environments. For example, one leading application is in the field of laser shock peening [57]. Structural characteristics of thin films are technologically very important.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Structural Property of Indium Tin Oxide Thin Films

Parsianpour¹,

Raoufi²,

Roostaei³

et al. 2017

AMPC

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In this study, Indium Tin Oxide (ITO) thin films were deposited by electron beam evaporation on white glass substrates with thicknesses of about 50, 100 and 170 nm. We investigated structural properties by X-ray Diffraction (XRD) and X-ray reflectivity (XRR). The results showed that ITO thin films have a crystalline structure with a domain that increases in size with increasing thickness. For uniform electron density, as the thin film roughness increases, reflectivity curve slope also increases. Also thinner film has more fringes than thicker film. The roughness determines how quickly the reflected signal decays. XRR technique is more suitable for very thin films, approximately 20 nm and less.

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Effects of Laser Induced Shock Waves on Metals

Cited by 144 publications

References 18 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

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Characterization and Structural Property of Indium Tin Oxide Thin Films

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