Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour

Peyre, P.; Fabbro, R.; Merrien, P.; Lieurade, H. P.

doi:10.1016/0921-5093(95)10084-9

Cited by 640 publications

(363 citation statements)

References 5 publications

Supporting

Mentioning

290

Contrasting

Unclassified

Order By: Relevance

“…To simplify the model, the function is assumed to be linear according to the hardness and residual stress distribution tests across the peened layer section of former studies [10,11]. By measuring the microhardness across the cross-section of the GHL, Peyre et al [10] found that the hardnesses decreases almost linearly along the depth and finally reach a level identical to the base material. The impact toughness is highest at the surface of the specimen and decreases linearly along the GHL.…”

Section: Modeling Of the Impact Toughness Of A Gradient Hardened Layermentioning

confidence: 99%

“…It was reported by Mats et al [9] that the increase of the impact toughness for the steel 15Kh2NMFA upon high-temperature ultrasonic treatment of various durations is due to the formation of a uniform defect structure. For the LSP processing technology, the mechanical properties of the hardened layer are not uniform [1,2,[10][11][12]. By the micro-hardness tests across the LSP peened layer, Peyre et al [10] reported that the hardness decreases gradually from surface to the base material.…”

Section: Introductionmentioning

confidence: 99%

“…For the LSP processing technology, the mechanical properties of the hardened layer are not uniform [1,2,[10][11][12]. By the micro-hardness tests across the LSP peened layer, Peyre et al [10] reported that the hardness decreases gradually from surface to the base material. Using the X-ray diffraction (XRD) measurement, Dane et al [11] reported that the residual compressive stresses induced by LSP process are gradually decreased along the depth and finally reach a level identical to the base material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Xia

Yan

et al. 2015

Acta Mech. Sin.

View full text Add to dashboard Cite

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.

show abstract

Section: Modeling Of the Impact Toughness Of A Gradient Hardened Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Xia

Yan

et al. 2015

Acta Mech. Sin.

View full text Add to dashboard Cite

show abstract

“…LSP is based on the application of a high intensity pulsed laser beam (Instant peak power density, I > 1 GW/cm 2 ; Laser pulse characteristic duration, τ < 50 ns) at the interface between the metallic target and the surrounding medium (a transparent confining material, normally water) forcing a sudden vaporization of the metallic surface into a high temperature and density plasma that immediately develops inducing a shock wave propagating into the material [2]. This shock wave induces plastic deformation and a residual stress distribution in the target material (if its peak pressure is greater than the dynamic yield limit) able to protect the component by means of a compressive residual stresses (RSs) field.…”

Section: Problem Definition and Theoretical/experimental Methodologymentioning

confidence: 99%

“…The capability of Laser Shock Processing (LSP) for the induction of residual stress fields in sub-surface layers of relatively thick specimens (d > 6 mm) in view of the improvement of their fatigue life has been widely demonstrated [1][2][3][4]. However, the LSP treatment of relatively thin specimens (normally d < 6 mm, but also thicker ones depending on the treatment intensity) brings, as an additional consequence, the possible bending of the treated specimen, a feature that can otherwise be employed for forming procedures according to the laser shock forming process.…”

Section: Introductionmentioning

confidence: 99%

Induction of through-thickness compressive residual stress fields in thin Al2024-T351 plates by laser shock processing

Ocaña

Correa

Porro

et al. 2015

International Journal of Structural Integrity

View full text Add to dashboard Cite

Laser Shock Processing (LSP) has been demonstrated as an emerging technique for the induction of RS's fields in sub-surface layers of relatively thick specimens. However, the LSP treatment of relatively thin specimens brings, as an additional consequence, the possible bending in a process of laser shock forming. This effect poses a new class of problems regarding the attainment of specified RS's depth profiles in the mentioned type of sheets, and, what can be more critical, an overall deformation of the treated component.The analysis of the problem of LSP treatment for induction of tentatively throughthickness RS's fields for fatigue life enhancement in relatively thin sheets in a way compatible with reduced overall workpiece deformation due to spring-back self-equilibration is envisaged in this paper.The coupled theoretical-experimental predictive approach developed by the authors has been applied to the specification of LSP treatments for achievement of RS's fields tentatively able to retard crack propagation on normalized specimens. A convergence between numerical code results and experimental results coming from direct RS's measurement is presented as a first step for the treatment of the normalized specimens under optimized conditions and verification of the crack retardation properties virtually induced.

show abstract

Micro‐Laser Processing

Özel²

2011

Micro‐Manufacturing

View full text Add to dashboard Cite

INTRODUCTIONThe use of laser technology in the processing of materials for micro-products has been reported over the last decade. Laser-based material processing on a microscale has been used in thermal processing, shock peening, surface treatment, cleaning of surfaces, welding, melting and polishing, scribing, as well as micromachining of basic geometric features on a variety of materials [1][2][3][4][5][6][7][8][9][10][11][12].Lasers are usually categorized as two groups: continuous wave (cw) and pulsed lasers. Conventional cw and pulsed laser irradiation and ablation is used in many fields, such as material processing, machining, etching, deposition, sintering, micro-fluidics, medical, and many other applications [13][14][15][16][17][18][19].The use of lasers in micro-manufacturing is closely connected to the characteristics of the laser. The main laser parameters to be chosen and controlled are wavelength, λ (nm); average power (W) or energy (J); intensity (W/m 2 ) or fluence, ( ) (J/m 2 ); pulse duration, τ (s); pulse repetition rates (Hz); and peak power (pulse energy/pulse duration) [9,11,16,20,21].Pulsed lasers achieve much higher intensities than cw lasers and are the preferred solution for the fabrication of micro-sized structures. Long-pulsed (nanosecond, ns), short-pulsed (picoseconds, ps), and ultrashort-pulsed (femtosecond, fs) lasers that are commonly used for repairing, trimming, marking, scribing, texturing, welding, ablation, cutting, and drilling include among others (i) Excimer lasers with ultraviolet (UV) wavelengths, (ii) Ti:sapphire lasers Micro-Manufacturing: Design and Manufacturing of Micro-Products, First Edition. Edited by Muammer Koç and TugrulÖzel.

show abstract

Laser shock processing of aluminium alloys. Application to high cycle fatigue behaviour

Cited by 640 publications

References 5 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

Induction of through-thickness compressive residual stress fields in thin Al2024-T351 plates by laser shock processing

Micro‐Laser Processing

Contact Info

Product

Resources

About