Elastoplastic analysis of process induced residual stresses in thermally sprayed coatings
- National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072 (China)
The residual stresses induced from thermal spraying process have been extensively investigated in previous studies. However, most of such works were focused on the elastic deformation range. In this paper, an elastoplastic model for predicting the residual stresses in thermally sprayed coatings was developed, in which two main contributions were considered, namely the deposition induced stress and that due to differential thermal contraction between the substrate and coating during cooling. The deposition induced stress was analyzed based on the assumption that the coating is formed layer-by-layer, and then a misfit strain is accommodated within the multilayer structure after the addition of each layer (plastic deformation is induced consequently). From a knowledge of specimen dimensions, processing temperatures, and material properties, residual stress distributions within the structure can be determined by implementing the model with a simple computer program. A case study for the plasma sprayed NiCoCrAlY on Inconel 718 system was performed finally. Besides some similar phenomena observed from the present study as compared with previous elastic model reported in literature, the elastoplastic model also provides some interesting features for prediction of the residual stresses.
- OSTI ID:
- 21476342
- Journal Information:
- Journal of Applied Physics, Vol. 108, Issue 1; Other Information: DOI: 10.1063/1.3374710; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COBALT ALLOYS
DEFORMATION
ELASTICITY
INCONEL 718
LAYERS
PLASMA
PLASTICITY
RESIDUAL STRESSES
SPRAY COATING
SPRAYED COATINGS
STRAINS
SUBSTRATES
YTTRIUM ALLOYS
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COATINGS
CORROSION RESISTANT ALLOYS
DEPOSITION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL ALLOYS
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
STRESSES
SURFACE COATING
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT ALLOYS