Laser milling of yttria-stabilized zirconia by using a Q-switched Yb:YAG fiber laser: experimental analysis

Guarino, Stefano; Ponticelli, Gennaro Salvatore; Giannini, Oliviero; Genna, Silvio; Trovalusci, Federica

doi:10.1007/s00170-017-1020-8

Cited by 39 publications

(23 citation statements)

References 41 publications

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“…Between the points B and C, the diameter is constant, as it Figure 9 shows the fatigue tests results in terms of number of cycles vs. the square root of laser interaction time with the substrate. The latter term, which is suggested to be proportional to the laser power, as reported in literature [12,32], allows a better understanding of the dependence of the fatigue life from the laser power itself. As expected, the number of cycles decreases as the laser power increases (Figure 9).…”

Section: Resultsmentioning

confidence: 82%

“…Moreover, when compared to other solutions, laser hardening causes little deformation of the part thanks to precise, controlled, and low heat input, thus virtually eliminating post-machining processes. In addition, laser sources can be applied to a wide range of materials [12][13][14][15][16]. All cast iron, medium-carbon steel, and tool steel are amenable to the laser hardening process [11], and even low carbon steels are amenable because of the rapid heating and cooling rates generated by the laser radiation [17].…”

Section: Introductionmentioning

confidence: 99%

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High Power Diode Laser (HPDL) for Fatigue Life Improvement of Steel: Numerical Modelling

Guarino

Ponticelli

2017

Metals

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This paper deals with the improvement of fatigue life of AISI 1040 steel components by using a High Power Diode Laser (HPDL). First, the meaningfulness of each operational parameter was assessed by varying the experimental laser power and scan speed. After laser treatment, fatigue tests were performed to investigate the influence of laser processing parameters on the material resistance. The fatigue tests were carried out by using a rotating bending machine. Wöhler curves were obtained from the analysis of experimental results. Second, in the light of experimental findings, a 3D transient finite element method for a laser heat source, with Gaussian energy distribution, was developed to predict the temperature and the depth of the heat affected zone on the workpiece. The model allows us to understand the relationship between the laser treatment parameters and the fatigue enhancement of the components. HPDL was found to significantly increase the fatigue life of the irradiated workpieces, thus revealing its suitability for industrial applications.

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Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

High Power Diode Laser (HPDL) for Fatigue Life Improvement of Steel: Numerical Modelling

Guarino

Ponticelli

2017

Metals

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“…The space of the possible powers is [−1, −0.5, 0, 0.5, 1], therefore discrete and constituted by five terms. Consequently, it contains 5 16 models, where 16 is given by multiplying the number of variables constituting each term with the number of terms, i.e., four in both cases. The constant term is not considered since the powers are fixed to zero.…”

Section: Fuzzy Optimizationmentioning

confidence: 99%

Soft Computing Techniques for Laser-Induced Surface Wettability Control

et al. 2021

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Making decisions and deducing control actions in manufacturing environments requires considering many uncertainties. The ability of fuzzy logic to incorporate imperfect information into a decision model has made it suitable for the optimization of both productivity and final quality. In laser surface texturing for wettability control, in fact, these aspects are governed by a complex interaction of many process parameters, ranging from those connected with the laser source to those concerning the properties of the processed material. The proposed fuzzy-based decision approach overcomes this difficulty by taking into account both the random error, associated with the process variability, and the systematic error, due to the modelling assumptions, and propagating such sources of uncertainties at the input level to the output one. In this work, the laser surface texturing was carried out with a nanosecond-pulsed laser on the surfaces of AISI 304 samples, changing the laser scanning speed, the hatch distance, the number of repetitions, and the scanning pattern. A significant change of the contact angle in the range 24–121° is observed due to the produced textures. The fuzzy maps highlight the inherent uncertainty due to both the laser texturing process and the developed model.

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“…Yttrium was selected as a dopant, since it promotes an excellent thermal and optical properties [47], being usually introduced in oxide form as a stabilizing agent. In fact, it has been largely employed in laser materials, namely yttrium aluminum garnets (YAG) or thermal barrier coatings (TBCs) due to its good thermal conductivity (13.6 W m −1 K −1 ), shock resistance and low thermal expansion coefficient [64][65][66]. Additionally, its melting point (2425°C) is close to the one of Gd 2 O 3 (2430°C).…”

Section: Yttrium-doped (Lgso:y)mentioning

confidence: 99%

Laser Floating Zone: General Overview Focusing on the Oxyorthosilicates Growth

Rey-García¹,

Bao-Varela²,

Costa³

2020

Synthesis Methods and Crystallization

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This chapter reviews the laser floating zone (LFZ) technique, also known as the laser-heated pedestal growth (LHPG), focusing on the recently produced rareearth-doped oxyorthosilicate fibers. LFZ has been revealed as a suitable prototyping technique since high-quality crystals can be developed in short time with low consumption of precursor materials in a crucible-free processing that ensures to practically avoid by-products. Moreover, additional advantages are the possibility to treat and melt highly refractory materials together with the easy way for tailoring the final microstructural characteristics and this way the macroscopic physical properties. Thus, refractory rare-earth (RE) doped oxyorthosilicates following the formula RE 2 SiO 5 have been recently produced by the LFZ technique for tuning laser emission parameters. The oxyorthosilicates have high chemical stability and allow incorporation of many rare-earth ions yielding different applications, such as laser host materials, gamma ray detectors or scintillators, environmental barrier coatings (EBCs) and waveguides, among others. Thus, different kinds of oxyorthosilicates were produced by the LFZ technique, and the detailed effects of the main processing parameters on crystal's characteristics are discussed in this chapter.

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Laser milling of yttria-stabilized zirconia by using a Q-switched Yb:YAG fiber laser: experimental analysis

Cited by 39 publications

References 41 publications

High Power Diode Laser (HPDL) for Fatigue Life Improvement of Steel: Numerical Modelling

High Power Diode Laser (HPDL) for Fatigue Life Improvement of Steel: Numerical Modelling

Soft Computing Techniques for Laser-Induced Surface Wettability Control

Laser Floating Zone: General Overview Focusing on the Oxyorthosilicates Growth

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