Pulsed Nd:YAG laser shock processing effects on mechanical properties of 6061-T6 alloy

İrizalp, Simge Gençalp; Saklakoğlu, Nurşen; Akman, Erhan; Demir, A.

doi:10.1016/j.optlastec.2013.08.011

Cited by 32 publications

(8 citation statements)

References 31 publications

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“…Such fatigue benefit is probably derived from the induced compressive residual stress by LP [4]. This conclusion is further verified by Irizalp's group [5]. Their research also revealed that the enlarged stacking fault ribbon, the new-formed deformation twins, and the increased twin boundary in the LP-treated AA 6061-T6 alloy may aid in the enhancement of both strength and high ductility [6].…”

Section: Introductionmentioning

confidence: 79%

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Huang

Wang

Sheng

et al. 2016

Metals

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Abstract:The aim of this paper is to study the effects of laser peening (LP) on the residual stress distribution and microstructure evolution of AA 6061-T6 under different temperatures. A laser peening experiment was conducted on the square-shape samples by using single spot and 50% overlap shock. Three-dimensional surface morphologies of treated samples were observed. The influence of peening temperature on the distribution of compressive residual stress was analyzed. An optical microscope (OM) and a transmission electron microscope (TEM) were employed to observe the microstructure evolution of the samples before and after LP. The results indicate that, as the peening temperature increases, the micro-hardness increases first and then decreases. The LP process induces high-amplitude compressive residual stress on the surface at different temperatures even if the compressive residual stress slightly reduces with increases in temperature. The maximum compressive residual stress affected layer depth is about 0.67 mm, appearing at a temperature of 160 • C. The OM test revealed that the grain size was significantly decreased after warm laser peening (WLP) and that the average value of grain size was reduced by 50%. The TEM test shows that more dislocation tangles were produced in AA 6061-T6 after WLP; compared to the LP process, the precipitate-dislocation interaction can benefit both strength and ductility for AA 6061-T6, thus enhancing the mechanical properties of the material.

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Section: Introductionmentioning

confidence: 79%

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Huang

Wang

Sheng

et al. 2016

Metals

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“…The magnitude and distribution of surface residual stresses were investigated by the sin 2 Ψ method [32]. The Ψ is the angle between the normal of the surface and the normal of the diffraction plane.…”

Section: Methodsmentioning

confidence: 99%

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Saklakoğlu

Bolouri

İrizalp

et al. 2021

Int J Adv Manuf Technol

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Shot peening processes are commonly used for improving the fatigue properties of steels. Shot peening introduces a compressive residual stress field in the near surface of steel, which can reduce or stop the growth of fatigue cracks and improve fatigue properties. This study experimentally investigated the effect of shot peening on the fatigue properties of 50CrV4 steel alloys with different artificial surface defects. Drilling tools were used to introduce different artificial defects with root radii of 0.585 mm and 0.895 mm on the surface of unpeened samples. The shot peening was applied to the drilled and undrilled samples. Scanning electron microscopy (SEM) observations, micro-hardness and X-ray diffraction residual stress measurements were conducted to analyse the characteristics of the shot-peened and unpeened samples. The results show that the shot peening leads to the transformation of the retained austenite to martensite in the near-surface microstructure. The hardness rates of the surface and near surface both increase by 8% after the shot peening. The peened samples exhibit compressive residual stresses with a high degree of isotropy in the near surface. The fatigue properties of samples were experimentally evaluated by conducting 3-point bending tests. The results indicate that the shot peening improves the fatigue life of drilled and undrilled samples. For the defects with the root radius of 0.895 mm, the shot peening leads to a 500% improvement in the fatigue life compared to unpeened samples regardless of defect depth. For the defects with the root radius of 0.585 mm, the improvement in fatigue life is 40% for the defect depth of 0.2 mm compared to unpeened samples. The improvement increases to 60% and 200% by increasing the defect depths to 0.4 mm and 0.6 mm. The fatigue properties are linked to the changes in the features of defects mainly caused by the deformation hardening and compressive residual stress after shot peening.

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“…For the experiments, rectangular strip-shaped specimens with dimensions of 150 × 10 × 2 mm 3 were used. The specimen dimensions were chosen in accordance with ASTM-B557 specifications and from available literature [16,18,19]. The physical and mechanical properties of the investigated alloys are reported in the Table 2.…”

Section: Methodsmentioning

confidence: 99%

Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys

Jelani

Shen

et al. 2017

Applied Sciences

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Abstract:The failure response of aluminum alloys under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found that the yield stress decreased with increasing laser power density. This implies that the load-bearing capacity of the specimens reduced under increased thermal or tensile loading. Consequently, the specimen's failure time was shortened by increasing either laser power density or preloaded speed. For Al-6061, a remarkable reduction in failure time by the increase of laser power density is found. However, for Al-7075, under higher preloaded speeds, comparatively smaller impact of laser power density on the failure time is reported. Moreover, for Al-6061, relatively a more non-uniform variation in the average failure time with the increase of laser power density or preloaded speed is observed. The failure mode of Al-6061 turned from brittle to ductile at higher laser power densities; whereas for Al-7075, it changed from quasi-brittle to ductile. At higher preloaded speeds, a greater degree of melting and ablation phenomenon can be seen due to relatively higher temperatures and higher heating rates.

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Pulsed Nd:YAG laser shock processing effects on mechanical properties of 6061-T6 alloy

Cited by 32 publications

References 31 publications

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys

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