Laser nitriding of iron by excimer laser irradiation in air and N2 gas

Schaaf, Peter; Emmel, A.; Illgner, C.; Lieb, Klaus‐Peter; Schubert, E.; Bergmann, H. W.

doi:10.1016/0921-5093(94)02718-8

Cited by 27 publications

(10 citation statements)

References 12 publications

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“…When using only a few short laser pulses under atmospheric conditions an enrichment of the iron sample with nitrogen is observed. The depth of the nitrided layer containing about 15 at-% nitrogen is found to be some 100nm [4,8]. The laser nitriding process is considered to be closely connected with the existence of both an iron melt and a laser induced plasma.…”

Section: * To Whom Correspondence Should Be Addressedmentioning

confidence: 99%

AES investigations of the iron surface composition after laser irradiation under atmospheric conditions

et al. 1998

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The laser induced modification of iron surfaces with atmospheric species was investigated by means of Auger electron spectroscopy (AES) and Scanning Electron Microscopy (SEM). Different laser systems were used for irradiating iron samples in a wide range of the laser processing parameters up to small foci and ultra short pulses.A nitriding of iron connected with an oxidation of the near surface region was observed in the wavelength range between 193 nm and 10,6 5m using large foci (; 0,1 cm2) and short pulses (10 ... 1400 ns). In the case of small foci (; 7W10-6 cm2) with ns-pulses (50 ns) an enrichment of the iron melt with nitrogen and an advanced oxidation of the surrounding area of the laser spot were detected. When using shorter pulses (200 fs, 40 ps) no indications for a nitriding were found

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Section: * To Whom Correspondence Should Be Addressedmentioning

confidence: 99%

AES investigations of the iron surface composition after laser irradiation under atmospheric conditions

et al. 1998

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“…L'action conjointe du chauffage laser et du plasma permet I'incorporation d'azote dans le substrat et la formation de nitrure d'aluminium. Ce procédé a été utilisé pour la nitruration du titane [2] et du fer [3,4] …”

Section: Introductionunclassified

Nitruration d'alliages légers par laser à excimère

1999

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Résumé : L'amélioration des propriétés tribologiques des alliages d'aluminium permettrait de substituer des pièces en acier ou en fonte dans les moteurs de voitures et donc d'alléger les véhicules et diminuer la consommation de carburant. Pour y parvenir il est nécessaire de renforcer la surface des alliages d'aluminium. Le procédé développé et utilisé dans cette étude est un procéd6 de nitruration par plasma produit par laser qui permet de synthétiser du nitrure d'aluminium en surface et jusqu'h une épaisseur de quelques microns. L'utilisation de plusieurs techniques d'analyse (analyses nucléaires, analyses cristallographiques, analyses par microscopie électronique) permet de décrire précisément la structure de la couche formée par ailleurs le rôle du plasma dans la formation de la couche a été étudié.

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“…Previous studies have shown that the excimer laser induced plasma plume could generate a high pressure in the GPa range at the specimen surface, which could enhance the adsorption of the ionised gases at the melt surface. 15) During the following solidification process, the adsorbed ions reacted with Al atoms and consequently formed the corresponding oxide and nitride at the surface of the aluminium alloy.…”

Section: Microstructurementioning

confidence: 99%

Stress Corrosion Cracking Behaviour of Excimer Laser Treated Aluminium Alloy 6013

Yue

Man

2008

Mater. Trans.

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The effect of excimer laser surface melting on the stress corrosion cracking behaviour of aluminium alloy 6013 has been investigated by means of a slow strain rate test at the open circuit potential, and at a constant anodic potential. After the laser treatment, a relatively thin nondentritic re-solidified layer, of the order of a few micrometres, and largely free of coarse constituent particles, has been produced. At the top surface of the re-solidified layer, an oxide-nitride bearing film, having a thickness of a couple of hundred nanometres, is present. The results of the slow strain rate test in a 3.5%NaCl solution showed that, in terms of total displacement to failure and corrosion current density, the stress corrosion resistance of the alloy was greatly increased by excimer laser melting. The superior stress corrosion resistance of the laser-treated material is attributed to the laser-formed oxide-nitride top film acting as a barrier and retarding the initiation of cracks.

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Laser nitriding of iron by excimer laser irradiation in air and N2 gas

Cited by 27 publications

References 12 publications

AES investigations of the iron surface composition after laser irradiation under atmospheric conditions

AES investigations of the iron surface composition after laser irradiation under atmospheric conditions

Nitruration d'alliages légers par laser à excimère

Stress Corrosion Cracking Behaviour of Excimer Laser Treated Aluminium Alloy 6013

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