X-ray diffraction measurement of residual stress in WC-Co thermally sprayed coatings onto metal substrates

Oladijo, Oluseyi Philip; Venter, А.M.; Cornish, L.A.; Sacks, Natasha

doi:10.1016/j.surfcoat.2012.01.044

Cited by 59 publications

(23 citation statements)

References 17 publications

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“…As reported in the literature, the physical properties of both, the substrate and feedstock used for the coating deposition, have a strong influence on the resulting stress state [78][79][80]. Song et al [79] showed that the magnitude of thermal stress decreases with an increasing preheating temperature of the substrate.…”

Section: Resultsmentioning

confidence: 97%

“…Song et al [79] showed that the magnitude of thermal stress decreases with an increasing preheating temperature of the substrate. Oladijo et al [80] found that a strong link exists between the stress field in the coating and the physical properties of the substrate, as its CTE relative to that of the substrate, plays a significant role. Thus, a different stress field in the coating was observed for the same feedstock and deposition characteristics when applied on substrates which provide a different CTE.…”

Section: Resultsmentioning

confidence: 99%

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Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

2017

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Abstract:Residual stresses have been a major source of concern, as they are an inevitable consequence of manufacturing and fabrication processes. The magnitude of these stresses is often as high as, or at least, comparable to the yield strength of the material. In terms of arc sprayed coatings, the utilization of bore hole drilling methods presents some practical disadvantages as mechanical parameters (Poisson's ratio, Young's modulus) need to be identified in order to determine the residual stress distribution. Curvature techniques using Almen strips are cost-and time-effective methods that can be used for analytical quality assurance. Within the scope of this work, a quantitative study of the amount of residual stresses induced in a twin wire arc spraying (TWAS) process for a given combination of process parameters was conducted using the incremental bore hole drilling method, as well as the curvature method including Almen strips. Therefore, the effect of the primary gas pressure, substrate preheating temperature, and handling parameters, such as the spray angle and gun velocity, which influence the coating deposition as well as the heat input into the substrate, are examined. The experiments were carried out by using an iron-based cored wire with cast tungsten carbides as filling. The results of both methods are in an acceptable accordance with each other. Different stress fields were observed depending on the parameter settings.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

2017

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“…Various experimental techniques have been developed to measure the residual stresses in materials, such as X-ray diffraction, 14 hole-drilling, 15 layer removal, 16 neutron diffraction, 17 synchrotron, 18 Raman spectroscopy, 19 ultrasonic method, 20 and magnetic method. 21 However, these methods all have some problems.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Residual Stresses Using Nanoindentation Method

Zhu

Xu²,

Wang

et al. 2014

Critical Reviews in Solid State and Materials Sciences

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Instrumented indentation, which is also known as nanoindentation or depth-sensing indentation, is increasingly being used to probe the residual stresses of materials including bulk solids, thin films, and coatings. The residual stresses are proved to have significant effects on various nanoindentation parameters such as hardness, loading curve, unloading curve, pile-up amount around indentation, and true contact area. By analyzing these parameters, numerous methods are developed to evaluate the residual stresses of materials in recent years. This article reviews six commonly used models which determine residual stresses from analyzing load-depth curves, as well as indentation fracture technique which is based on the classical fracture mechanics. Emphasis is placed on the principle, application and limitation of each nanoindentation method.

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“…X-Ray diffraction stress measurement can be an useful tool for failure analysis and also for process development studies. Quantifying the residual stresses present in a component, which may either accelerate or arrest fatigue or stress corrosion cracking, is frequently crucial to understanding the cause of failure [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Coating of Dies for Advanced Squeeze Casting Process

Peter¹,

Rosso²,

Castella³

2014

Acta Metall Slovaca

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Premature failure of dies is a critical problem of manufacturers in hot-working processes, e.g. metal die casting, hot extrusion and/or thixoextrusion of aluminium/magnesium or steel. Typically, die material has to be resistant to heat cycling or corrosion environment, to plastic deformation and wear, especially when exposed to high temperature during continuous working cycle. The resistance of dies could be increased by the modification of their surfaces, i.e. by the application of an adequate coating. An improvement of the resistance of H11 steel substrate will be presented and discussed. Here, the coatings will be realized through both by High Velocity Oxy-Fuel coating spray method and by plasma spray method. Firstly, the measurement of the residual stress will be carried out on the un-coated and coated substrate. Secondly, morphological analysis by optical and scanning electron microscopy will be performed on the powders used for the coating and on the coated materials. Such investigations aim finding the most favourable conditions, as concern the materials to be employed for the deposition and the more appropriate deposition techniques, in order to achieve improved properties for the dies which can be used in innovative casting techniques, i.e. squeeze casting and/or some related modified processes. Keywords:Al-based alloys, deposition methods, morphological analysis, residual stress measurment IntroductionDegradation of hot working components is directly correlated to the design, materials employed for the manufacturing as well as the operation history. High reactivity of steel with Al and its alloys as a consequence of the high solubility of Al in α-Fe and of Fe in liquid Al has a strong effect on the dies lifetime. As a result of the repeated contact of the die surface and the casting alloy dies are continuously exposed to erosion and corrosion. Due to different degradation mechanisms attributed to wear, as well as to corrosion-or thermo mechanical fatigue during service, a gradual failure of the die surfaces occurs, reducing the castings quality and the dies duration. The tool materials used for hot-working dies should be resistant to wear, heat cycling and thermal fatigue, plastic deformation and corrosion. In addition, they have to present high hardness, yield strength, creep resistance and toughness at high temperatures. In order to minimize or to avoid the die surface from any negative effects, the dies have to be produced employing an appropriate alloy or by modifying their surfaces through some suitable treatments. Many technological solutions are available today: some of them are related to nitriding

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X-ray diffraction measurement of residual stress in WC-Co thermally sprayed coatings onto metal substrates

Cited by 59 publications

References 17 publications

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

Measurement of Residual Stresses Using Nanoindentation Method

Investigations on Coating of Dies for Advanced Squeeze Casting Process

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