Improvement of thermally sprayed WC–Co/NiCr coatings by surface laser processing

Gisario, Annamaria; Puopolo, M.; Venettacci, Simone; Veniali, F.

doi:10.1016/j.ijrmhm.2015.06.001

Cited by 32 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laser technology has become the object of increasing interest as a viable, affordable, and reliable sealing and densification post-treatment process, in thermal spray coatings, for improving the performance of the coatings [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Gisario et al [30] found consistent improvements in the mechanical properties of Diamalloy coatings deposited by high velocity oxy-fuel (HVOF), by reprocessing them by diode laser at a higher power and a reduced scan speed. Similarly, appropriate combinations of laser parameters have been shown to improve the structure density, hardness, and wear endurance of the WC-Co/NiCr coatings, using diode lasers, post-treatment [31].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

et al. 2019

View full text Add to dashboard Cite

Hot corrosion affects the components of diesel engines and gas turbines working at high temperatures, in the presence of low-melting salts and oxides, such as sodium sulfate and vanadium oxide. Thermal-sprayed coatings of nickel-chromium-based alloys reinforced with ceramic phases, can improve the hot corrosion and erosion resistance of exposed metals, and a sealing thermal, post-treatment can prove effective in reducing the permeability of aggressive species. In this study, the effect of purposely-optimized high-power diode laser reprocessing on the microstructure and type II hot corrosion resistance of cermet coatings of various compositions was investigated. Three different coatings were produced by high velocity oxy-fuel and was tested in the presence of a mixture of Na 2 SO 4 and V 2 O 5 at 700 • C, for up to 200 h: (i) Cr 3 C 2 -25% NiCr, (ii) Cr 3 C 2 -25% CoNiCrAlY, and (iii) mullite nano-silica-60% NiCr. Results evidenced that laser sealing was not effective in modifying the mechanism, on the basis of the hot corrosion degradation but could provide a substantial increase of the surface hardness and a significant decrease of the overall coating material consumption rate (coating recession), induced by the high temperature corrosive attack.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The laser has also been widely used as a machine tool to modify the surface of the engineering materials, such as laser surface alloying, laser cladding, surface texturing, laser physical vapor deposition, laser polishing, etc. [2,[10][11][12][13][14][15][16][17][18][19][20]. Ultimately, surface modifications or surface treatments are vitally important for increasing service life of the critical components and devices used for engineering and structural functions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Al₂O₃Processing on the Microtexture and Morphology of Mold Steel: Hydrophilic-to-Hydrophobic Transition

Guo¹

2019

Wettability and Interfacial Phenomena - Implications for Material Processing

View full text Add to dashboard Cite

The surface of mold steel was processed by the simple Al 2 O 3 surface processing, and the influence of processing time on the surface morphology was studied by 3D profilometer and scanning electron microscopy (SEM). Moreover, the wettability of the Al 2 O 3 microtextured surfaces of mold steel was also investigated. The results show that the surface morphology of mold steel varies with Al 2 O 3 processing time. It reveals that the initial surface without any Al 2 O 3 processing treatment behaves as a hydrophilic surface. With the increment of Al 2 O 3 processing time, the surface roughness of the processed surface with the microtextures increases correspondingly. At the same time, the wettability of the microtextured surfaces changes from the hydrophilic to the hydrophobic. When Al 2 O 3 processing time reaches 60 min, the contact angle reaches its maximum at which the relevant surface roughness is the minimum. It indicates that mold steel with an Al 2 O 3 microtextured surface can be a potential application in the mold releasement.

show abstract

“…The frequently applied highly resistant materials used for cladding processes consist of WC/Co, WC/Ni, WC/Stellite, WC/W 2 C and WC/NiCr powder mixtures [7][8][9][10]. The participation of tungsten carbide (WC) particles in the manufactured clads causes mainly the improvement of its hardness, wear resistance and toughness.…”

Section: Introductionmentioning

confidence: 99%

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Przestacki

Chwalczuk

Wojciechowski

2017

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Laser cladding technology enables the regeneration or manufacturing of machine parts with the improved surface layer properties. The materials applied during the laser cladding processes very often contain hard and wear-resistant tungsten carbide (WC) particles. However, the parts obtained after the laser cladding have usually unsatisfactory surface quality and thus require post-process finishing. In addition, the content of WC particles causes that clad layers are difficult to cut. Therefore, in order to improve their machinability, the laser-assisted machining (LAM) technology can be applied. Nevertheless, the material removal mechanisms during LAM of WC/NiCr clad layers are not recognized. Thus, this study is focused on the estimation of minimum uncut chip thickness and analysis of cutting forces which are important factors describing the chip decohesion process. The proposed method is based on the novel approach dedicated directly to the oblique cutting, considering the zeroth tangential force increment located onto rounded cutting edge. The experimental procedure involves cutting force component (F c , F f , F p ) measurements in the range of variable cutting conditions, as well as the cutting tool's micro-geometry inspection. On the basis of the measurements carried out, the force regression equations are formulated and subsequently applied to the determination of tangential force expression. Subsequently, the minimum uncut chip thickness is calculated on the basis of the equation derived from the zero tangential force increment condition and presented in function of cutting speed. The obtained results enable the effective selection of the cutting parameters during LAM of WC/NiCr clad layers.

show abstract

Improvement of thermally sprayed WC–Co/NiCr coatings by surface laser processing

Cited by 32 publications

References 24 publications

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Influence of Al₂O₃Processing on the Microtexture and Morphology of Mold Steel: Hydrophilic-to-Hydrophobic Transition

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Contact Info

Product

Resources

About

Improvement of thermally sprayed WC–Co/NiCr coatings by surface laser processing

Cited by 32 publications

References 24 publications

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

Influence of Al2O3Processing on the Microtexture and Morphology of Mold Steel: Hydrophilic-to-Hydrophobic Transition

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Contact Info

Product

Resources

About

Influence of Al₂O₃Processing on the Microtexture and Morphology of Mold Steel: Hydrophilic-to-Hydrophobic Transition