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| Abstract No.: |
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Scheduled at:
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Tuesday, June 03, 2008, Room 04 9:30 AM
Corrosion Protection 1
Corrosion protection through thermal sprayed coatings including cathodic and high temperature corrosion, coating of large areas for offshore facilities and comparable applications
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| Title: |
Predicting quenching and cooling stresses within HVOF deposits
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| Authors: |
Joseph Stokes* / School of Mechanical & Manufacturing Engineering, National Centre for Plasma Science and Technology, Dublin City University, Ireland
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| Abstract: |
Due to the nature of the HVOF and other thermal spray processes, residual stress build up in thick deposits is a significant and limiting problem. The residual stress-state that evolves in a deposit is largely dependent on the thermal conditions to which the system has been subjected, and is a combination of quenching stresses, which arise during deposition, and cooling stresses, post-deposition. It follows that precise control of these phenomena is essential, if a thick deposit or one with low levels of residual stress are to be thermally sprayed. This paper applies looks at analytical and finite element techniques used to predict quenching and cooling stresses within tungsten carbide-cobalt thermally sprayed deposits. The analysis investigates and predicts with more accuracy the quenching and cooling stresses using improved analytical and FEA techniques by validating the models with experimental results such as X-Ray Diffraction and the Hole Drilling Method. The results of this paper will aid thermal spray researchers in achieving even greater deposit thicknesses through the understanding of residual stress.
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