Analysis of the residual stress in the cold spray technique using eneutron diffraction and SPH modelling
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Date
2013-09-10
Authors
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Publisher
Australian Nuclear Science and Technology Organisation
Abstract
Cold spray is a material deposition technique in which metal powder particles, 5~5Oum, are accelerated up to speeds 500-i 000m/s by carrier gas stream, impact a metallic substrate and are subsequently bonded to the surface. Unlike conventional thermal spraying techniques, the cold spray technique is largely kinetic with the bonding precipitating from adiabatic shear instabilities, localised plastic deformation and thermal gradients while these mechanisms go some way to 1 describing the bonding they are contentious and are still an active area of research A factor and
a distinctive feature of the cold spray process which is closely related to the coating integrity and linked to the bonding mechanism, is the residual stress that builds up in the material during spraying. Neutron diffraction measurements were carried out at the OPAL research reactor,
ANSTO, using the KOWARI strain scanner to investigate the residual stresses that form during this deposition process. An Al-606i sample with a gauge volume O.5x0 5x18 mm was used allowing the authors to measure stress profiles with fine enough through-thickness resolution in the macroscopically thick coatings. The experimentally determined through thickness stress profiles were used to validate FE calculations made for 100 um thick coatings using the Smooth Particle Hydrodynamics, SPH, techniques. The micromechanical modelling provided by SPH demonstrates the particle-particle interaction and the underlying connection of the thermo-mechanical history of the deposited particles to the development oi” the macroscopic residual stress.
Description
Physical copies of the abstract book held by ANSTO Library at DDC: 620.1123/20
Keywords
Residual stresses, Neutron diffraction, Powder metallurgy, OPAL Reactor, Measuring instruments, ANSTO, Coatings
Citation
Saleh, M., Luzin, V., & Spencer, K. (2013). Analysis of the residual stress in the cold spray technique using neutron diffraction and SPH modelling. Presentation to MECA SENS 2013: 7th International Conference on Mechanical Stress Evaluation by Neutron and Synchrotron Radiation, 10-12 September 2013, Coogee, Menai, New South Wales, Australia, (pp. 114).