Inhibition of metal dusting using thermal spray coatings and laser treatment

Voisey, K.T.; Liu, Z.; Stott, F.H.

doi:10.1016/j.surfcoat.2005.12.020

Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings (2015)
Journal Article
Chen, H., McCartney, D., & Voisey, K. (in press). Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings. Materials at High Temperatures, 32(1-2), https://doi.org/10.1179/0960340914Z.000000000103

This study deals with the isothermal oxidation behaviour of high velocity oxy-fuel sprayed MCrAlY coatings. Both free-standing coatings and coatings attached to IN738 and CMSX4 substrates undergo isothermal oxidation at 1100°C for up to 100h. The eff... Read More about Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings.

Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure (2014)
Journal Article
Hashemzadeh, M., Powell, J., & Voisey, K. (2014). Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure. Optics and Lasers in Engineering, 55, https://doi.org/10.1016/j.optlaseng.2013.10.001

Laser piercing is used to generate a starting point for laser cutting. The pierced hole is normally larger than the kerf width, which means that it cannot lie on the cut line. An experimental program investigating the piercing process as a function o... Read More about Fibre laser piercing of mild steel: the effects of power intensity, gas type and pressure.

The application of specific point energy analysis to laser cutting with 1 ?m laser radiation (2014)
Journal Article
Hashemzadeh, M., Suder, W., Williams, S., Powell, J., Kaplan, A., & Voisey, K. (2014). The application of specific point energy analysis to laser cutting with 1 ?m laser radiation. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.110

Specific point energy (SPE) is a concept that has been successfully used in laser welding where SPE and power density determine penetration depth. This type of analysis allows the welding characteristics of different laser systems to be directly comp... Read More about The application of specific point energy analysis to laser cutting with 1 ?m laser radiation.

Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy (2014)
Journal Article
Li, C., Murray, J., Voisey, K., Clare, A., & McCartney, D. (2014). Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy. Applied Surface Science, 289, https://doi.org/10.1016/j.apsusc.2013.10.140

Laser surface melting (LSM) pre-treatment was conducted before large area electron beam (LAEB) treatment in an attempt to eliminate the cracking of the amorphous layer. In our previous work, LAEB treatment successfully generated an amorphous layer on... Read More about Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy.

Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V (2014)
Journal Article
Voisey, K., Folkes, J., Srithorn, J., & Hughes, D. (2014). Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.051

Fibre lasers provide an unprecedented combination of high beam quality, brightness and low cost. Fibre laser beams can provide an exceptionally high power density beam with a relatively large depth of focus. Compared to more established laser welding... Read More about Neutron strain scanning of fibre and diode laser welds in stainless steel and Ti6Al4V.

Effect of Q-switched laser surface texturing of titanium on osteoblast cell response (2014)
Journal Article
Voisey, K., Scotchford, C., Martin, L., & Gill, H. (2014). Effect of Q-switched laser surface texturing of titanium on osteoblast cell response. Physics Procedia, 56, https://doi.org/10.1016/j.phpro.2014.08.027

Titanium and its alloys are important biomedical materials. It is known that the surface texture of implanted medical devices affects cell response. Control of cell response has the potential to enhance fixation of implants into bone and, in other ap... Read More about Effect of Q-switched laser surface texturing of titanium on osteoblast cell response.

Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat (2013)
Journal Article
Chen, H., Hyde, T., Voisey, K., & McCartney, D. (2013). Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat. Materials Science and Engineering: A, 585, https://doi.org/10.1016/j.msea.2013.06.080

High velocity oxy-fuel thermal spraying was used to prepare free-standing CoNiCrAlY (Co–31.7% Ni–20.8% Cr–8.1% Al–0.5% Y (wt%)) bond coat alloy samples approximately 0.5 mm thick. Creep tests were conducted at 750 °C on these samples using a small pu... Read More about Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat.

Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation (2013)
Journal Article
Li, C., Murray, J., Voisey, K., Clare, A., & McCartney, D. (2013). Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation. Applied Surface Science, 280, https://doi.org/10.1016/j.apsusc.2013.05.005

Amorphous Al-Co-Ce alloys are of interest because of their resistance to corrosion, but high cooling rates are generally required to suppress the formation of crystalline phases. In this study, the surface of a bulk crystalline Al-Co-Ce alloy of a gl... Read More about Amorphous layer formation in Al86.0Co7.6Ce6.4 glass-forming alloy by large-area electron beam irradiation.

Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10 (2012)
Journal Article
Bakare, M., Voisey, K., Chokethawai, K., & McCartney, D. (in press). Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10. Journal of Alloys and Compounds, 527, https://doi.org/10.1016/j.jallcom.2012.02.127

The corrosion behaviour of both crystalline and largely amorphous forms of the Fe-based glass forming alloy, Fe43Cr16Mo16C15B10 alloy was investigated. Two different methods were used to induce transformation to the amorphous form of the alloy: laser... Read More about Corrosion behaviour of crystalline and amorphous forms of the glass forming alloy Fe43Cr16Mo16C15B10.

Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type (2011)
Journal Article
Kamdi, Z., Shipway, P., Voisey, K., & Sturgeon, A. (2011). Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type. Wear, 271(9-10), https://doi.org/10.1016/j.wear.2010.12.060

Abrasive wear behaviour of materials can be assessed using a wide variety of testing methods, and the relative performance of materials will tend to depend upon the testing procedure employed. In this work, two cermet type coatings have been examined... Read More about Abrasive wear behaviour of conventional and large-particle tungsten carbide-based cermet coatings as a function of abrasive size and type.

Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics (2011)
Journal Article
Niaz, A., Boatwright, A., Voisey, K., & Walsh, D. A. (2011). Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics. Journal of Electroanalytical Chemistry, 657(1-2), https://doi.org/10.1016/j.jelechem.2011.03.009

The effect of thermal spraying on the electrochemical activity of an anti-corrosion superalloy was studied quantitatively using scanning electrochemical microscopy (SECM). The superalloy used was Inconel 625 (a Ni base superalloy) and thin coatings o... Read More about Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: effect of thermal spraying on heterogeneous electron transfer kinetics.

Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect (2011)
Journal Article
Powell, J., Al-Mashikhi, S., Kaplan, A., & Voisey, K. (2011). Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect. Optics and Lasers in Engineering, 49(8), https://doi.org/10.1016/j.optlaseng.2011.03.011

This paper presents the results of an experimental and theoretical investigation into the phenomenon of 'striation free cutting', which is a feature of fibre laser/oxygen cutting of thin section mild steel. The paper concludes that the creation of ve... Read More about Fibre laser cutting of thin section mild steel: an explanation of the 'striation free' effect.

Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings (2011)
Journal Article
Saeidi, S., Voisey, K., & McCartney, D. (2011). Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings. Journal of Thermal Spray Technology, 20(6), https://doi.org/10.1007/s11666-011-9666-5

HVOF and VPS coatings were sprayed using a Praxair (CO-210-24) CoNiCrAlY powder. Free standing coatings underwent vacuum annealing at different temperatures for times of up to 840h. Feedstock powder, as-sprayed and annealed coatings were characterise... Read More about Mechanical properties and microstructure of VPS and HVOF CoNiCrAlY coatings.

Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel (2011)
Journal Article
Al-Mashikhi, S., Powell, J., Kaplan, A., & Voisey, K. (2011). Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel. Journal of Laser Applications, 23(4), https://doi.org/10.2351/1.3614404

The effect of cutting speed and sheet thickness on surface oxidation and heat affected zones (HAZs) has been investigated for laser-oxygen cutting of mild steel sheet with a fiber laser. Optical and scanning electron micrographs were used to determin... Read More about Heat affected zones and oxidation marks in fiber laser-oxygen cutting of mild steel.

The effects of microstructural features on the performance gap in corrosion resistance between bulk and HVOF sprayed Inconel 625 (2010)
Journal Article
Ahmed, N., Bakare, M., McCartney, D., & Voisey, K. (2010). The effects of microstructural features on the performance gap in corrosion resistance between bulk and HVOF sprayed Inconel 625. Surface and Coatings Technology, 204(14), https://doi.org/10.1016/j.surfcoat.2009.12.028

It is commonly observed that there is a performance gap between the corrosion resistance of thermally sprayed coatings and the equivalent bulk material. This is attributed to the significantly modified microstructure of the sprayed coatings. However,... Read More about The effects of microstructural features on the performance gap in corrosion resistance between bulk and HVOF sprayed Inconel 625.

X-ray photoelectron spectroscopy study of the passive films formed on thermally sprayed and wrought Inconel 625 (2010)
Journal Article
Bakare, M., Voisey, K., Roe, M., & McCartney, D. (2010). X-ray photoelectron spectroscopy study of the passive films formed on thermally sprayed and wrought Inconel 625. Applied Surface Science, 257(3), https://doi.org/10.1016/j.apsusc.2010.07.066

There is a well known performance gap in corrosion resistance between thermally sprayed corrosion resistant coatings and the equivalent bulk materials. Interconnected porosity has an important and well known effect, however there are additional relev... Read More about X-ray photoelectron spectroscopy study of the passive films formed on thermally sprayed and wrought Inconel 625.

Investigation into the effect of beam shape on melt pool characteristics using analytical modelling (2010)
Journal Article
Ahmed, N., Voisey, K., & McCartney, D. (2010). Investigation into the effect of beam shape on melt pool characteristics using analytical modelling. Optics and Lasers in Engineering, 48, https://doi.org/10.1016/j.optlaseng.2009.12.013

An established analytical model is used to simulate an extended laser beam. Multiple Gaussian sources are superimposed to form a rectangular beam and results are compared with a single circular Gaussian source model as well as experimental results fr... Read More about Investigation into the effect of beam shape on melt pool characteristics using analytical modelling.

Visualisation of the local electrochemical activity of thermally-sprayed anti-corrosion coatings using scanning electrochemical microscopy (2009)
Journal Article
Walsh, D., Li, L. E., Bakare, M., & Voisey, K. (2009). Visualisation of the local electrochemical activity of thermally-sprayed anti-corrosion coatings using scanning electrochemical microscopy. Electrochimica Acta, 54(20), https://doi.org/10.1016/j.electacta.2009.03.057

Scanning electrochemical microscopy was used to probe the local electrochemical activity of anti-corrosion coatings formed from Inconel 625, a Ni-Cr-Mo alloy commonly used in engineering applications. The coatings were formed using a high velocity ox... Read More about Visualisation of the local electrochemical activity of thermally-sprayed anti-corrosion coatings using scanning electrochemical microscopy.

The effect of laser transformation notching on the controlled fracture of a high carbon (C70S6 ) steel (2008)
Journal Article
Zhang, D., Harris, S. J., McCartney, D., Pashby, I., Powell, J., Shipway, P., & Voisey, K. (2008). The effect of laser transformation notching on the controlled fracture of a high carbon (C70S6 ) steel. Materials Science and Engineering: A, 489(1-2), https://doi.org/10.1016/j.msea.2007.12.040

A high carbon (C70S6) steel has been laser surface treated using CO2 and Diode lasers in order to produce an embrittled region to act as a fracture notch. Such a process has been investigated as a precursor to the fracture splitting of automotive eng... Read More about The effect of laser transformation notching on the controlled fracture of a high carbon (C70S6 ) steel.

Inhibition of metal dusting using thermal spray coatings and laser treatment (2006)
Journal Article
Voisey, K., Liu, Z., & Stott, F. (2006). Inhibition of metal dusting using thermal spray coatings and laser treatment. Surface and Coatings Technology, 201(3-4), https://doi.org/10.1016/j.surfcoat.2005.12.020

Alloy 600 and Alloy 800H are susceptible to metal dusting. Both alloys were thermally sprayed with two different corrosion resistant coatings: Ni50Cr and Ni31Cr11Al0.6Y. Laser remelting was used to enhance further the effectiveness of these coatings... Read More about Inhibition of metal dusting using thermal spray coatings and laser treatment.

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