The Measurement of Residual Stresses in Cold Sprayed Nickel Based Superalloys via Neutron Diffraction

Tuesday, May 12, 2015: 5:20 PM
Room 102A (Long Beach Convention and Entertainment Center)
Ms. Sun Yung Kim , Swinburne University of Technology, Hawthorn, VIC, Australia
Dr. Vladimir Luzin , Australian Nuclear Science and Technology Organisation, Sydney, Australia
Dr. John Thornton , DSTO, Melbourne, Australia
Dr. Peter King , CSIRO, Melbourne, Australia
Dr. Darren Fraser , CSIRO, Melbourne, Australia
Mr. Mitchell L. Sesso , Swinburne University of Technology, Hawthorn, VIC, Australia
Mr. Stefan Gulizia , CSIRO, Melbourne, Australia
Dr. Yat Choy Wong , Swinburne University of Technology, Hawthorn, VIC, Australia
Prof. Christopher C. Berndt , Swinburne University of Technology, Hawthorn, VIC, Australia
Inconel 625 and 718 (IN625 and IN718) are nickel-based superalloys commonly employed in environments where their ability to resist hot and chemical corrosion while maintaining mechanical integrity under such punishing conditions can be exploited. Such unique properties are, however, offset by the difficulties experienced in machining and manufacturing this material. Cold gas dynamic spray is a new additive manufacturing technique that offers the ability to repair or even form near net shapes from starting materials in powder form. As the process impact energies are high, the particles during deposition are plastically deformed and residual stresses are introduced. In this study, the residual stresses in cold sprayed IN625 and IN718 coatings on aluminium alloy and IN625 substrates with varying thicknesses were mapped as a function of depth via neutron diffraction techniques. Microstructural properties in the form of hardness, porosity and surface topography are also presented.
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