Hardness, Microstructure and Surface Characterization of Laser Gas Nitrided Commercially Pure Titanium Using High Power CO&lt;SUB&gt;2&lt;/SUB&gt; Laser

Selvan, J. Senthil; Subramanian, K. G.; Nath, Ashish Kumar; Gogia, A.K.; Balamurugan, A.; Rajagopal, S.

doi:10.1361/105994998770347512

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…The microstructure of HAZ2 is characterized by almost equiaxed and smaller grains with respect to HAZ1, in agree with the literature and the physical phenomenon occurring during titanium laser processing. [23] Finally, Figure 4(e) shows a micrograph of the BM, characterized by a fully lamellar microstructure, with very thin lamellae.…”

Section: Resultsmentioning

confidence: 99%

Selective Laser Treatment on Cold-Sprayed Titanium Coatings: Numerical Modeling and Experimental Analysis

Carlone

Astarita

Rubino

et al. 2016

Metall Mater Trans B

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In this paper, a selective laser post-deposition on pure grade II titanium coatings, cold-sprayed on AA2024-T3 sheets, was experimentally and numerically investigated. Morphological features, microstructure, and chemical composition of the treated zone were assessed by means of optical microscopy, scanning electron microscopy, and energy dispersive X-ray spectrometry. Microhardness measurements were also carried out to evaluate the mechanical properties of the coating. A numerical model of the laser treatment was implemented and solved to simulate the process and discuss the experimental outcomes. Obtained results highlighted the key role played by heat input and dimensional features on the effectiveness of the treatment.

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Section: Resultsmentioning

confidence: 99%

Selective Laser Treatment on Cold-Sprayed Titanium Coatings: Numerical Modeling and Experimental Analysis

Carlone

Astarita

Rubino

et al. 2016

Metall Mater Trans B

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“…Cracks in the cross section of the nitrided layer can also originate from the process of cutting specimens. Microcracks between the nitrided layers and the heat-affected zone may also be related to the inherent brittleness of titanium nitride [23].…”

Section: Cracks Of the Nitrided Layersmentioning

confidence: 99%

Laser Surface Nitriding of Ti–6Al–4V Alloy in Nitrogen–Argon Atmospheres

Yao

Wood

et al. 2020

Coatings

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Surface-nitrided layers of Ti–6Al–4V alloy were fabricated using a diode laser in pure and mixed gas atmospheres of nitrogen and argon. The surface morphology, microstructure, hardness, and cracks of the nitrided layers were investigated. In all gas atmospheres, the layers showed smooth and humped regions, and consisted of planar nitrogen titanium (TiN), dendrites, and acicular martensite. The surface roughness was improved dramatically as the nitrogen concentration of the atmosphere was diluted with argon. Overall, the hardness of the nitrided layer was greatest for pure nitrogen and it tended to decrease as the concentration of argon in the atmosphere increased. However, the hardness of the layer for pure nitrogen also decreased rapidly, from the surface to matrix, in comparison to the diluted nitrogen atmospheres. It was shown that the number and size of dendrites, which determine hardness, are controlled by the nitrogen concentration. The dendrites of the nitrided layer were denser and smaller in a pure nitrogen atmosphere, than in diluted nitrogen atmospheres. Longitudinal and transverse cracks were observed in the nitrided layers. These two types of cracks were decreased or even eliminated as the argon concentration of the nitrogen–argon atmosphere was increased. Therefore, by diluting the nitrogen atmosphere with argon, the nitrided layer properties, in terms of surface roughness and cracks, can be improved, but this may also cause a reduction in the layer hardness.

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“…This allows greater control in producing the desired microstructures. The RTP processing using laser beams on producing microstructures is similar to the use of e-beams and several research groups [51][52][53][54][55][56][57][58][59][60][61][62][63] have obtained microstructures on different kinds of materials (metals, alloys, ceramics) for several applications, including automotive manufacturing, biological, optical and magnetic materials. A schematic of the typical experimental set-up for microstructuring with lasers is given in figure 3.…”

Section: Rtp Processing Using Laser Beamsmentioning

confidence: 99%

High-energy density beams and plasmas for micro- and nano-texturing of surfaces by rapid melting and solidification

Surla¹,

Ruzic²

2011

J. Phys. D: Appl. Phys.

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Several advances in materials research have been made due to the wide array of tools currently available for the processing of materials: plasmas, electron beams, ion beams and lasers. The area of material science is fortunate to have seen the development of these tools over the years, be it for new bulk materials, coatings or for surface modification. Several applications have benefited and many more will in the future as the properties of the materials are altered on a micro/nanoscale. Currently, several techniques exist to modify the physical, chemical and biological properties of the material surface; however, this review limits itself to surface modification applications using the rapid thermal processing (RTP) technique. First, a brief overview of the existing surface modification methods using the principles of RTP is reviewed, and then a novel method to create micro/nanostructures on the surface using pulsed plasma exposure of materials is presented.

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Hardness, Microstructure and Surface Characterization of Laser Gas Nitrided Commercially Pure Titanium Using High Power CO<SUB>2</SUB> Laser

Cited by 12 publications

References 19 publications

Selective Laser Treatment on Cold-Sprayed Titanium Coatings: Numerical Modeling and Experimental Analysis

Selective Laser Treatment on Cold-Sprayed Titanium Coatings: Numerical Modeling and Experimental Analysis

Laser Surface Nitriding of Ti–6Al–4V Alloy in Nitrogen–Argon Atmospheres

High-energy density beams and plasmas for micro- and nano-texturing of surfaces by rapid melting and solidification

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