Influence of cold spray parameters on the microstructures and residual stress of Zn coatings sprayed on mild steel

Maledi, Nthabiseng; Oladijo, Oluseyi Philip; Botef, Ionel; Ntsoane, T.P.; Madiseng, A.; Moloisane, L.

doi:10.1016/j.surfcoat.2017.03.062

Cited by 49 publications

(16 citation statements)

References 27 publications

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“…Compressive residual stress (CRS) enhances fatigue life and tensile strength [ 27 ], and the RS can be measured by high-energy X-ray diffraction [ 31 ]. However, this measurement method cannot be used in a slot with only 150 μm width due to using a large facula [ 36 ]. The final service performance is decided by the mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy

Zhang

Xue

et al. 2018

Materials

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In this study, minimum quantity coolant/lubrication (MQCL) is found to have significant impact on the surface quality and mechanical properties of the micromilled thin-walled work piece that is the core component of an aeroaccelerometer. Three kinds of coolants were used in the micromilling process to analyze their effects on surface quality and mechanical properties of the component. The experiment results show that an appropriate dynamic viscosity of coolant helps to improve surface roughness. The high evaporation rate of the coolants can enhance the cooling performance. Comparing with the dry machining case, MQCL has better performance on improving tool wear, surface quality, and mechanical properties of the micromilled work piece. It yielded up to 1.4–10.4% lower surface roughness compared with the dry machining case in this experiment. The machined work piece with the best mechanical properties and the one with the worst mechanical properties appeared in the ethyl alcohol and the dry machining case, respectively. The reasons for deteriorating surface quality and mechanical properties in dry machining cases are also analyzed. For improving the micromilling process, the penetration and cooling effect of the coolants are more important. This paper gives references to obtain better service performance of the component by improving the micromilling process.

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Section: Resultsmentioning

confidence: 99%

Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy

Zhang

Xue

et al. 2018

Materials

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“…However, because of the intimate association of macerals within coal, determining the effect of one maceral group can be a challenge. As a result, separation techniques such as chemical fractionation, density separation and centrifuging, have been used to better appreciate the structural properties and the reactivity of individual maceral groups (Maledi et al 2017). These techniques may have an adversarial effect on the maceral composition hence misleading results.…”

Section: Discussionmentioning

confidence: 99%

Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

Keboletse

Ntuli

Oladijo

2021

Int J Coal Sci Technol

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Coal due to its relatively large quantities and wide distribution worldwide has generated renewed interest in research and development with the aim of establishing coal conversion technologies that are technically reliable, environmentally and economically feasible. It has proved to be a prominent energy source in emerging markets with increasing energy demand by accounting for the largest increase in the demand of energy amongst all other energy sources. Furthermore, with its higher mesophase content, coal tar is an appropriate raw material for precursors in the production of carbon fiber. However, whenever a material is put to use, it is important to be able to associate its properties to the behavioral characteristics during a conversion process so as to have a basis for opting for the material in a given process or adjusting the operating conditions in order to optimize the material utilization. Therefore, as with any other material, it is important to be able to relate the properties of coal to its utilization. A review was carried out on the influence of coal properties on four main utilization technologies: gasification, carbonization, liquefaction and carbon fibre production. Among several properties rank, type, mineral matter content, distribution of trace elements, structural composition and pore structure were found to be most influential on the behavior of coal during conversion processes.

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“…3d increase in ASR with the increase in SOD at 240A and voltage 24V is about thirty-six percent up to 4.95 microns. This type of variation in ASR with respect to SOD indicates that slower particle speed associated with longer SOD results in less deformation upon impact (Maledi et al, 2017). Furthermore, the atomized particles delaminate more significantly upon impact for longer SOD.…”

Section: Effect Of Sod On the Asrmentioning

confidence: 90%

“…Thus, cracks appear near the interface region. Moreover, as the SOD increases, inflight particles become more oxidized, which reduces cohesion between layers (Maledi et al, 2017). Consequently, coating produced with longer SOD shows larger proportions of oxides as well as a higher amount of cracks due to lack of interlamellar adhesion.…”

Section: Cross-sectional Morphology Of Eas Coatingmentioning

confidence: 99%

“…Optimized process parameters were found for the low surface roughness value and high coating thickness. Maledi et al (2017) produced cold sprayed zinc coating to evaluate the influence of temperature, pressure, and spraying distance with regard to the microstructure, microhardness, and coating thickness. The study indicated that an increase in temperature resulted in an increase in microhardness whilst an increase in SOD led to a decrease in microhardness and coating thickness.…”

Section: Introductionmentioning

confidence: 99%

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Effect of spraying parameters on surface roughness, deposition efficiency, and microstructure of electric arc sprayed brass coating

al.¹

2020

Int. j. adv. appl. sci.

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Thermal, chemical, and metallurgical surface treatment techniques are being applied to give materials the desirable properties for numerous applications in service. Nowadays, electric arc spraying of copper alloys has gained importance in surface engineering owing to their excellent mechanical properties. However, electric arc sprayed metallic coating usually has high coating roughness and low deposition efficiency upon adherence to the substrate. In this article, the brass coating was deposited onto a mild steel substrate using a twin wire arc spraying technique. The spraying parameters current, voltage, and spray off distance were varied during the deposition process. To gain an understanding, the effect of these spraying parameters on the characteristics of the coating was investigated in terms of its surface roughness, deposition efficiency, and microstructure. The primary purpose of this research is to optimize the process in terms of coating roughness and deposition efficiency. Based on the results obtained, it was observed that an increase in voltage and spray off distance resulted in an increase in coating roughness, whilst an increase in current resulted in a decrease in coating roughness. Deposition efficiency was also greatly affected by the process parameters and decreased significantly with the longer spray off distance. Furthermore, the deposition efficiency increased with the decrease in surface roughness and vice versa. The best results in terms of low coating roughness, high deposition efficiency, and optimized microstructure were found at 24V, 240A, and 100 mm. The use of small diameter feedstock, supersonic nozzle incorporated in equipment, better surface preparation, and optimized process parameters gave better results as compared to the previous study in the field of electric arc spray coating.

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Influence of cold spray parameters on the microstructures and residual stress of Zn coatings sprayed on mild steel

Cited by 49 publications

References 27 publications

Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy

Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy

Influence of coal properties on coal conversion processes-coal carbonization, carbon fiber production, gasification and liquefaction technologies: a review

Effect of spraying parameters on surface roughness, deposition efficiency, and microstructure of electric arc sprayed brass coating

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