Effects of Powder Size in Cored Wire on Arc-Sprayed Metal-Ceramic Coatings

Fang, Jianjun; Li, Z.X.; Qian, Ming; Ren, C.L.; Shi, Yu

doi:10.31399/asm.cp.itsc2007p0365

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lamellar microstructure results from the splashing and overlapping of individual spray particles and depends on the spray particle conditions at the moment of impact onto the substrate [20][21][22][23][24]. The generation of spray particles, i.e., the droplet formation, is determined by the aerodynamically driven disintegration of the molten electrode tips as well as the magnetofluid-dynamic processes and thus depends on the flow characteristics of the atomization gas, the thermodynamic properties and transport quantities (for partially ionized plasma in the area of arc discharge), as well as the physical properties of the electrodes (e.g., material-specific properties of the melt) [24][25][26][27][28]. Numerous studies have already dealt with the use of different atomizing gas types for the production of arc-sprayed coatings [22,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Machine Hammer Peening and Its Effect on the Surface Integrity of Arc-Sprayed WC-W2C-FeCMnSi Coatings

Hagen,

Baumann,

Heidelmann

et al. 2023

Coatings

View full text Add to dashboard Cite

With respect to post-processing techniques in the field of surface engineering, it was recently found that machine hammer peening (MHP) represents a promising approach to functionalizing thermally sprayed coatings as the MHP contributes to a compression of the coating, enabling the potential to reduce the coating porosity as well as the protruding peaks of the rough as-sprayed coating surface. The MHP also has the potential to induce compressive residual stresses in the coating surface, which can positively affect the mechanical and tribological properties. Arc-sprayed tungsten carbide-reinforced Fe-based coatings pose an appropriate candidate to counteract the wear of tribologically stressed surfaces. Due to the inherent process characteristics, however, these coatings are mostly characterized by a heterogeneous lamellar microstructure with residual porosity and interstratified with a certain amount of oxides, as well as the presence of tensile residual stresses. To adjust their microstructural and mechanical coating properties, the applicability of a subsequent MHP was evaluated in this study. Therefore, arc-sprayed WC-W2C reinforced FeCMnSi coatings are deposited using either argon or compressed air as atomization and shroud gas, providing different lamellar structures and oxide content. The effect of MHP on the surface integrity of the WC-W2C-FeCMnSi coating is investigated with respect to its porosity, lamellar structure, hardness, and residual stresses, which are known as relevant influencing factors on the performance of tribologically stressed components. It was found that the MHP leads to reduced porosity and lamella thickness as well as increased hardness due to strain hardening effects. Furthermore, it was demonstrated that the MHP leads to the introduction of compressive residual stresses, which contribute to a decline in tensile residual stresses in the near-surface area.

show abstract

Section: Introductionmentioning

confidence: 99%

Machine Hammer Peening and Its Effect on the Surface Integrity of Arc-Sprayed WC-W2C-FeCMnSi Coatings

Hagen,

Baumann,

Heidelmann

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

Asymmetric Melting Behavior in Twin Wire Arc Spraying with Cored Wires

2008

View full text Add to dashboard Cite

Asymmetric melting behavior of the electrodes is a process-related feature of the Twin Wire Arc Spraying (TWAS) technique since the heating of the negative connected wire is different from that of the positive connected wire. Due to these differences in melting behavior, a tracking of particle velocity and temperature for both electrodes individually is very important. Particle velocity and temperature have been recorded from anode side and cathode side by positioning the tracking device respectively. To draw the whole picture of the spraying, jet, particles have been tracked also from the top side of the spray gun. The goal of this study is to have an experimental data setup for model building and simulation of depositing process in TWAS. Corresponding measuring devices have been employed to investigate the TWAS process by spraying of massive and cored wires.

show abstract

Microstructural and Tribo-mechanical Properties of Arc-Sprayed CoCr-Based Coatings

2022

View full text Add to dashboard Cite

Due to their superior wear and oxidation resistance, Stellite™ coatings are widely used in industrial applications, where the coatings are exposed to high temperature. Common processes for applying Stellite™ coatings include the high-velocity oxy-fuel spraying, laser cladding, and plasma transferred arc welding. Although Stellite™ welding consumables or similar welding consumables in the form of cored wires (CoCr base without industrial property rights) are commercially available, there are hardly any studies on arc-sprayed Stellite™ coatings available in the literature. In this study, the microstructural characteristics of arc-sprayed deposits were investigated, which were produced using a CoCr-based cored wire with addition of 4.5 wt.% tungsten. The produced deposits were examined in its as-sprayed state as well as after exposed to elevated temperatures. The microstructure was scrutinized by means of electron microscopy, energy-dispersive x-ray spectroscopy, as well as x-ray diffraction analyses using synchrotron radiation. Tribo-mechanical tests were conducted in order to assess the performance of the arc-sprayed coating. The findings were discussed and compared to those obtained from conventional CoCr-based coatings. It was found that the arc-sprayed CoCr-based coating is predominantly composed of Co-rich, Cr-rich lamellae or lamellae comprising a Co(Cr)-rich solid solution interspersed with various oxides between the individual lamellae. Solid solution hardening serves as dominant strengthening mechanism, while precipitation hardening effects are hardly evident. With regard to the oxidation behaviour, the as-sprayed coating mainly contains CoCr2O4 as well as traces of Co3O4. For heating above 550 °C, coating surface additionally consists of Fe2O3 and Co3O4. In dry sliding experiments, the arc-sprayed CoCr-based coating shows a decreased wear resistance compared to CoCr-based coatings processed by HVOF and PTA, whereas the coefficient of friction (COF) sliding against alumina was similar to the COF observed for the HVOF-sprayed CoCr-based coating, but lower than the COF obtained for the CoCr-based hardfacing alloy deposited by PTA.

show abstract

Effects of Powder Size in Cored Wire on Arc-Sprayed Metal-Ceramic Coatings

Cited by 3 publications

References 0 publications

Machine Hammer Peening and Its Effect on the Surface Integrity of Arc-Sprayed WC-W2C-FeCMnSi Coatings

Machine Hammer Peening and Its Effect on the Surface Integrity of Arc-Sprayed WC-W2C-FeCMnSi Coatings

Asymmetric Melting Behavior in Twin Wire Arc Spraying with Cored Wires

Microstructural and Tribo-mechanical Properties of Arc-Sprayed CoCr-Based Coatings

Contact Info

Product

Resources

About