Experimental investigation for pulsed laser nitriding of metals

Huang, Yuanjie; Zhu, Yu; Yu, Zhiwen; Wu, Lingyuan; Zhang, Li; Zhang, Yongqiang; Wu, Jichuan; Tan, Fuli

doi:10.1016/j.optlastec.2022.108661

Cited by 5 publications

(9 citation statements)

References 24 publications

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“…After the time reaches 40 ns, the concentration of nitrogen profile changes slightly because the laser pulse is already terminated for some time and the aluminum is cooling down. According to Huang et al’s experimental results, the N* can be measured within a depth of 600 nm. It can be found from the partially enlarged drawing in Figure a that the calculated N* concentration less than 10 PPM occurs at approximately 600 nm away from the surface.…”

Section: Resultsmentioning

confidence: 99%

“…At the edge of the plume, the velocity is the highest, which is a typical distribution of a shock wave. 42 It is not difficult to find that the shock wave expands out of the computational domain after 20 ns. It is worth noting that the plume density is very low at the positions close to the edge of the plume.…”

Section: Plume Expansion and Plasma Formationmentioning

confidence: 99%

“…In a laser nitriding process, a laser beam locally focuses on the metals to heat the surfaces in a nitrogen atmosphere. 5,42 To make nitrogen better incorporated into the material, in some cases, the nitrogen gas could also be sprayed to the heated site by a jet. 43 Katayama et al 44 technique for enhancing the titanium surface mechanical properties for the first time.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that laser surface modification of metals can enhance their hardness, fatigue strength, and wear resistance. − As a neoteric method, laser nitriding combines the advantages of surface nitriding and laser modification. In a laser nitriding process, a laser beam locally focuses on the metals to heat the surfaces in a nitrogen atmosphere. , To make nitrogen better incorporated into the material, in some cases, the nitrogen gas could also be sprayed to the heated site by a jet . Katayama et al reported an LN technique for enhancing the titanium surface mechanical properties for the first time.…”

Section: Introductionmentioning

confidence: 99%

“…Only limited research studies have been reported to investigate the mechanism underlining the process of aluminum LN to date. Huang et al investigated the aluminum LN processes through multiple measurement methods to demonstrate the chemically active state and lifetime of nitrogen. Some simulation investigations have been done to uncover the mechanism of laser surface modification of metals and nitriding metals. − However, most of the numerical studies mainly focused on the laser ablation metals and plasma formation coupling processes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical Simulation of Rapid Nitriding of Aluminum via Pulsed Laser

Ran

Cheng

et al. 2023

Ind. Eng. Chem. Res.

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To better understand the mechanisms of pulsed laser-assisted synthesis of metal nitride, a numerical model was proposed to simulate the process of laser nitriding of aluminum. The model incorporated various multiphysical processes in the laser nitriding process, including heating, melting and vaporization of aluminum, formation of plasma plume, shielding of laser energy, ionization of nitrogen gas, and the transport of nitrogen in the chemically active state N* (N atoms and N+ ions) inside the aluminum. The simulated results are in good agreement with the existing experimental results in terms of laser intensity, laser impulse, N+ lifetime in plume, and nitrogen diffusion depth in aluminum. The model can well simulate the laser shielding process by plume and the nitriding process of aluminum. Characteristics of the plume expansion, plasma formation, nitrogen ionization, and diffusion were investigated systematically by the developed model. Investigations on the effects of key operating conditions show that the impact of laser wavelength is negligible, while the full-width at half-maximum (FWHM), nitrogen gas pressure, and laser intensity have a significant impact on the laser nitriding process of aluminum. The larger FWHM and larger laser intensity yield a layer with a higher N* concentration and greater thickness. The higher nitrogen gas pressure leads to an increase in N* concentration at the same position.

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Section: Resultsmentioning

confidence: 99%

Section: Plume Expansion and Plasma Formationmentioning

confidence: 99%