High Space-Resolutive Evaluation of Subsurface Stress Distribution by Strain Scanning Method with Analyzer Using High-Energy Synchrotron X-Rays

Shobu, Takahisa; Мizuki, J.; Suzuki, Kenji; Akiniwa, Yoshiaki; Tanaka, Keisuke

doi:10.1299/jsmea.49.376

“…Above 1 ps, as the pulse duration increased, the crater depth decreased and the melted region widened around the irradiated area, which suggested that thermal effects, such as heat diffusion, dominated over the shock effects. 30 Below 1 ps, as the pulse duration decreased, the crater depth decreased and the irradiated area increased, which suggested a decrease in the laser fluence. Drogoff et al and Nielsen et al reported that for an ultrashort pulsed laser with a pulse duration below 1 ps, the amount of ablation was less dependent on the pulse durations.…”

Section: A Effects Of Optical Nonlinear Phenomenamentioning

confidence: 99%

“…2. 30 The diffracted x rays were detected using a CdTe detector. The size of the incident and receiving slits were 200 μm in the horizontal direction and 5 μm in the vertical direction.…”

Section: G Dislocation Densitymentioning

confidence: 99%

Influence of Pulse Duration on Mechanical Properties and Dislocation Density of Dry Laser Peened Aluminum Alloy using Ultrashort pulsed Laser-driven Shock Wave

Yoshida,

Nishibata,

Matsuda

et al. 2023

Laser Congress 2023 (ASSL, LAC)

0

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This study aims to investigate the influence of the pulse duration on the mechanical properties and dislocation density of an aluminum alloy treated using dry laser peening (DLP), which is a laser peening technique that uses ultrashort pulsed laser-driven shock wave to eliminate the need for a sacrificial overlay under atmospheric conditions. The results of the micro-Vickers hardness test, residual stress measurement, and dislocation density measurement demonstrate that over a pulse duration range of 180 fs to 10 ps, the maximum peening effects are achieved with a pulse duration of 1 ps. Moreover, the most significant DLP effects are obtained by choosing a pulse duration that achieves a laser intensity that simultaneously generates the strongest shock pressure, suppresses optical nonlinear effects, and realizes the least thermal effects, which weaken the shock effects. Shock temperature calculations based on thermodynamic equations also suggest that a laser intensity driving a shock pressure less than 80 GPa, as in the case of a pulse duration of 1 ps in this study, maintains the solid state of the material throughout the process, resulting in significant DLP effects.

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Internal stress distribution for generating closure domains in laser-irradiated Fe–3%Si(110) steels

Iwata

¹

,

Imafuku

²

,

Suzuki

³

et al. 2015

Journal of Applied Physics

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Internal stress distribution for generating closure domains occurring in laser-irradiated Fe–3%Si(110) steels was investigated using high-energy X-ray analysis and domain theory based on the variational principle. The measured triaxial stresses inside the specimen were compressive and the stress in the rolling direction became more dominant than stresses in the other directions. The calculations based on the variational principle of magnetic energy for closure domains showed that the measured triaxial stresses made the closure domains more stable than the basic domain without closure domains. The experimental and calculation results reveal that the laser-introduced internal stresses result in the occurrence of the closure domains.

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Influence of pulse duration on mechanical properties and dislocation density of dry laser peened aluminum alloy using ultrashort pulsed laser-driven shock wave

Yoshida

¹

,

Nishibata

²

,

Matsuda

³

et al. 2022

Journal of Applied Physics

View full text Add to dashboard Cite

This study aims to investigate the influence of the pulse duration on the mechanical properties and dislocation density of an aluminum alloy treated using dry laser peening (DLP), which is a laser peening technique that uses ultrashort pulsed laser-driven shock wave to eliminate the need for a sacrificial overlay under atmospheric conditions. The results of the micro-Vickers hardness test, residual stress measurement, and dislocation density measurement demonstrate that over a pulse duration range of 180 fs to 10 ps, the maximum peening effects are achieved with a pulse duration of 1 ps. Moreover, the most significant DLP effects are obtained by choosing a pulse duration that achieves a laser intensity that simultaneously generates the strongest shock pressure, suppresses optical nonlinear effects, and realizes the least thermal effects, which weaken the shock effects. Shock temperature calculations based on thermodynamic equations also suggest that a laser intensity driving a shock pressure less than 80 GPa, as in the case of a pulse duration of 1 ps in this study, maintains the solid state of the material throughout the process, resulting in significant DLP effects.

show abstract

High Space-Resolutive Evaluation of Subsurface Stress Distribution by Strain Scanning Method with Analyzer Using High-Energy Synchrotron X-Rays

Cited by 6 publications

References 5 publications

Influence of Pulse Duration on Mechanical Properties and Dislocation Density of Dry Laser Peened Aluminum Alloy using Ultrashort pulsed Laser-driven Shock Wave

Influence of Pulse Duration on Mechanical Properties and Dislocation Density of Dry Laser Peened Aluminum Alloy using Ultrashort pulsed Laser-driven Shock Wave

Internal stress distribution for generating closure domains in laser-irradiated Fe–3%Si(110) steels

Influence of pulse duration on mechanical properties and dislocation density of dry laser peened aluminum alloy using ultrashort pulsed laser-driven shock wave

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