Microstructure and wear resistance of TaC reinforced Ni-based coating by laser cladding

Chao, Mingju; Wang, Wenli; Liang, Erjun; Ouyang, D.

doi:10.1016/j.surfcoat.2007.08.021

Cited by 101 publications

(43 citation statements)

References 22 publications

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“…Agglomeration of TiC was also found within the melt pool of tracks 4,6,8 and 12. These types of TiC distribution and segregation have also been reported in laser processed MMC coatings on titanium surfaces 7 and TIG torch processed coatings on titanium and steel surfaces.…”

Section: Microstructurementioning

confidence: 85%

Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Mridha

Baker

2015

Materials Science and Technology

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An overlapping composite track coating was produced on a steel surface by preplacing an 0.5 mm thick layer of TiC powder and then melting using a TIG torch of constant energy input. The influence of the overlapping operation on preheating of the substrate, the dissolution of TiC particulates and the subsequent depth and hardness of the composite layer was analysed. The melt microstructure consisted of both undissolved and partially dissolved TiC particulates, together with a variety of morphologies and sizes of TiC particles precipitated during solidification. Preheating, resulting from the overlapping operation occurred, producing additional melting of the TiC particulates and deeper melt depths but with a reduced volume fraction of TiC precipitates in the subsequent tracks. A maximum hardness of over 800 Hv was developed in the composite layer. The high hardness was unevenly distributed in tracks melted at the initial and final stages, while it varied across the melt depths in other tracks.

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Section: Microstructurementioning

confidence: 85%

Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Mridha

Baker

2015

Materials Science and Technology

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“…High energy laser and electron beam melting techniques are established means of processing such composite layers, which are reported to increase wear and corrosion resistance significantly. [1][2][3][4][5][6][7][8] However, application of these techniques is limited in practice because of the high costs of the equipment. Previous surface engineering work using the tungsten inert gas (TIG) welding torch melting technique, [9][10][11][12][13][14][15][16][17][18][19] produced either a small hemispherical volume of a modified surface, or a single melt track with a width of a few millimetres running the length of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Melting of multipass surface tracks in steel incorporating titanium carbide powders

Mridha

Idriss

Maleque

et al. 2015

Materials Science and Technology

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Overlapping tracks were processed by melting preplaced titanium carbide (TiC) powder on steel surfaces using a tungsten inert gas torch. The tracks produced ~1.0 mm melt depth free from cracks, but occasional pores were observed. The microstructure consisted of unmelted and partially melted TiC particulates together with reprecipitated TiC particles, which were prominent in tracks processed in the initial stage. A greater number of reprecipitated globular and cubic TiC particles were observed in tracks processed in the later stages, indicating more dissolution of TiC particulates from the overlapping operation. Those multitracks processed in the initial stage developed a maximum hardness of 850-1000 HV, which was lower in most other tracks, although comparable hardness values were recorded in the last track.

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“…In addition, the hardness varies greatly (from about 630 to 250 HV 0.2 ) with varying locations from the bulk Ti 3 Al coating to pure Ti substrate, which can be explained by the fact that near the coating-substrate interface, the bottom of the coating was diluted by the substrate material melted from the surface of the substrate and resulted in lower hardness. In the heat-affected zone of the pure Ti substrate, the hardness is higher than the initial one of substrate materials (about 250 HV 0.2 ), due to the occurrence of phase transformation [39].…”

Section: High-temperature Oxidation Test Friction and Wear-analysis mentioning

confidence: 92%

Improvement of the Oxidation and Wear Resistance of Pure Ti by Laser-Cladding Ti3Al Coating at Elevated Temperature

et al. 2011

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Ti 3 Al coating was in situ synthesized successfully on pure Ti substrate by laser-cladding technology using aluminum powder as the precursor. The composition and microstructure of the prepared coating were analyzed by transmission electron microscopy, scanning electron microscopy (SEM), and X-ray diffraction technique. Thermal gravimetric analysis was used to evaluate the high-temperature oxidation resistance of the Ti 3 Al coating. The friction and wear behavior was tested through sliding against Si 3 N 4 ball at elevated temperature of 20, 100, 300, and 500°C. The morphologies of the worn surfaces and wear debris were also analyzed by SEM and threedimensional non-contact surface mapping. The results show that the Ti 3 Al coating with high microhardness, hightemperature oxidation resistance, and high temperature wear resistance. The pure Ti substrate is dominated by severe adhesion wear, abrasive wear, fracture, and severe plastic deformation at lower temperature, and severe adhesion wear, abrasive wear, plastic deformation, oxidation, and nitriding wear at higher temperature, whereas the Ti 3 Al coating experiences only moderate abrasive and adhesive wear when sliding against the Si 3 N 4 ceramic ball counterpart. In addition, the wear debris of the laser-cladding Ti 3 Al coating sliding and Si 3 N 4 friction pairs are much smaller than that of pure Ti substrate and Si 3 N 4 friction pairs at elevated temperature.

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Microstructure and wear resistance of TaC reinforced Ni-based coating by laser cladding

Cited by 101 publications

References 22 publications

Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Melting of multipass surface tracks in steel incorporating titanium carbide powders

Improvement of the Oxidation and Wear Resistance of Pure Ti by Laser-Cladding Ti3Al Coating at Elevated Temperature

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