Abstract No.:
3019

 Scheduled at:
Tuesday, September 27, 2011, Saal B2.2 11:00 AM
Modeling & Simulation 1


 Title:
Modeling of peening stress in HVOF sprayed IN718 coating

 Authors:
Christophe Lyphout* / University West, Sweden
Per Nylén / University West, Sweden
Christer Persson/ Chalmers University, Sweden

 Abstract:
The High Velocity Oxy-Fuel (HVOF) thermal spray process can generate significant peening stresses due to the impact at high velocity of semi molten particles onto the substrate. The level of kinetic and thermal energy of these impinging particles is a key-parameter to fundamentally understand how residual stresses are built up during the deposition, which can be important to fundamentally understand the relationships between particle in-flight characteristics, residual stresses and the resulting coating adhesion strength. A numerical Finite Element Model (FEM), which includes successive impacts of particles, was for this purpose developed. The model makes it possible to isolate peening stresses from quenching and thermal mismatch stresses, thus making more fundamental investigations of relationships between particle in-flight characteristics and residual stresses possible. Simulations were performed on Inconel 718 particles impinging on Inconel 718 substrate. Relationships between the peening stress state at the substrate interface and the impinging particle temperature and velocity was given particular interest.

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