Laser nitriding of metals

Schaaf, Peter

doi:10.1016/s0079-6425(00)00003-7

Cited by 315 publications

(163 citation statements)

References 282 publications

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“…The temperature profiles are comparable to other more refined simulations -made by finite difference method by Schaaf [8] in this energy density regime for iron.…”

Section: Resultssupporting

confidence: 83%

Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

Májlinger

Szabó

Bobor

2009

Per. Pol. Mech. Eng.

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The air pollution emission standards for automobiles are going to be more strict worldwide. European automotive manufacturer makes a laser treatment on the cast iron cylinder bores of the V-engine blocks. Samples of laser treated cast iron cylinder bore with lamellar graphite were investigated. Seven samples were treated with XeCl-excimerlaser, Nd-YAG laser and Yb-fiber laser sources. In order to evaluate the microstructure and grain size of the laser treated layer, scanning electron microscopic (SEM) images were taken in cross section with a SEM/focused ion beam (FIB) dual beam electron microscopes. All the samples were found to be ultra fine grained. To simulate the heating conditions during laser treatment, finite element method (FEM) simulations were made for the different lasertypes. Additional X-ray diffraction measurements showed retained austenite after laser treatment.

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“…The temperature profiles are comparable to other more refined simulations -made by finite difference method by Schaaf [8] in this energy density regime for iron.…”

Section: Resultssupporting

confidence: 83%

Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

Májlinger

Szabó

Bobor

2009

Per. Pol. Mech. Eng.

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“…Phase formation of Fe-N thin films has been extensively studied by several co-workers using different thin film deposition techniques such as magnetron sputtering, [29,30] ion beam sputtering, [31,32] e-beam evaporation, [33] pulsed laser deposition, [34,35] as nitrogen partial pressure is increased in a physical vapor deposition method, different types of Fe-N phases are formed and they can be broadly classified as: nanocrys-…”

Section: Resultsmentioning

confidence: 99%

Study of magnetic iron nitride thin films deposited by high power impulse magnetron sputtering

Tayal

Gupta

et al. 2015

Surface and Coatings Technology

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In this work, we studied phase formation, structural and magnetic properties of iron-nitride (Fe-N) thin films deposited using high power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (dc-MS). The nitrogen partial pressure during deposition was systematically varied both in HiPIMS and dc-MS. Resulting Fe-N films were characterized for their microstructure, magnetic properties and nitrogen concentration. We found that HiPIMS deposited Fe-N films show a globular nanocrystalline microstructure and improved soft magnetic properties. In addition, it was found that the nitrogen reactivity impedes in HiPIMS as compared to dc-MS. Obtained results can be understood in terms of distinct plasma properties of HiPIMS.

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“…Therefore, the phase transitions giving rise to the surface reconstructions need to be considered. First two reactions, (1) and (2), occur on α-Fe and γ'-Fe 4 N which has cubic lattice though the former is bcc and the latter is fcc with Unauthenticated Download Date | 5/10/18 10:40 AM lattice constants 0.287 nm and 0.380 nm 8 , respectively. The reaction (3) is just a saturation of ε-Fe x N from stoichiometry Fe 3 N to Fe 2 N. This iron nitride has hcp structure with much bigger lattice constants.…”

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confidence: 99%

Kinetics of nanocrystalline iron nitriding

Arabczyk

Zamłynny

Moszyński

2010

Polish Journal of Chemical Technology

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Nitriding of nanocrystalline iron was studied under the atmosphere of pure ammonia and in the mixtures of ammonia -hydrogen -nitrogen at temperatures between 350 o C and 500 o C using thermogravimetry and x-ray diffraction. Three stages of nitriding were observed and have been ascribed to the following schematic reactions: (1) α-Fe → γ'-Fe 4 N, (2) γ'-Fe 4 N → ε -Fe 3 N and (3) ε -Fe 3 N → ε -Fe 2 N. The products of these reactions appeared in the nitrided nanocrystalline iron not sequentially but co-existed at certain reaction ranges. The dependence of a reaction rate for each nitriding stage on partial pressure of ammonia is linear. Moreover, a minimal ammonia partial pressure is required to initiate the nitriding at each stage.

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Laser nitriding of metals

Cited by 315 publications

References 282 publications

Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

Formation of surface layer on cast iron cylinder bore due to nanosecond laser impulses

Study of magnetic iron nitride thin films deposited by high power impulse magnetron sputtering

Kinetics of nanocrystalline iron nitriding

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