Residual Stresses Induced by Laser-Shocks

Ballard, Patrick; Fournier, J.; Fabbro, R.; Frelat, Joël

doi:10.1051/jp4:1991369

Cited by 67 publications

(69 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This behavior is because the laser induced shock pressure is proportional to the square root of laser power density according to Fabbro's model [23], i.e., the higher laser power density is, the higher the laser induced shock pressure is. According to the research of Ballard et al [24], plastically affected depth is proportional to the difference between shock pressure and HEL. Thus, higher shock pressure induces deeper plastically affected depth.…”

Section: Depth Of the Ghlmentioning

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.

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: Depth Of the Ghlmentioning

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.

View full text Add to dashboard Cite

show abstract

“…In order to avoid these high temperatures from melting the metal surface, a black paint layer coating the surface was found to protect it from these thermal effects. It is well known that the thermo-protective coating not only protects against thermal effects, but also can result in higher shock pressures in the metal [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In the confined ablation mode, when the peak pressure exceeds twice the dynamic yield strength of the metal, the pressure led to the saturant plastic deformation at the surface and favorable compressive residual stresses in the depth of the metal target [10]. LSP has been shown to significantly improve the material surface hardness and fatigue life of many metals in a number of studies [3][4][5][6][7][8][9][10][11]. Clauer [11] observed an almost linear increase of the affected depth with the number of the LSP impacts on a 0.55% carbon steel.…”

Section: Introductionmentioning

confidence: 99%

Simulation of multiple laser shock peening of a 35CD4 steel alloy

Ding

2006

Journal of Materials Processing Technology

101

View full text Add to dashboard Cite

“…For a quick estimation, the following simple analytical expressions can be used for plastically affected depth, L p , and the surface residual stress, σ suf , induced by LSP [93]:…”

Section: Physics Of Laser Shock Peeningmentioning

confidence: 99%

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

Residual Stresses Induced by Laser-Shocks

Cited by 67 publications

References 0 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

Simulation of multiple laser shock peening of a 35CD4 steel alloy

Micro‐Laser Processing

Contact Info

Product

Resources

About