Thermal property measurements of metal injection moulded Inconel 625 and Inconel 718 using combined thermal analysis techniques

ABSTRACT

The high-temperature thermal properties of powder metallurgy derived superalloys have not been reported in the literature. In this study, the coefficient of thermal expansion (CTE), specific heat and thermal diffusivity of metal injection moulded (MIM) Inconel 625 and Inconel 718 were measured. Measurements of wrought Nickel 200 were also made to verify the methods. These thermal property measurements were made in the range of room temperature to 1000–1200°C using dilatometry, differential scanning calorimetry and laser flash analysis. Thermal conductivity of all three materials was calculated using the measured diffusivity, specific heat and CTE. All the MIM results were compared to published data for the wrought form of these alloys and found to be in close agreement outside of phase transition regions.

KEYWORDS:

• Superalloys
• metal injection moulding
• thermal analysis
• thermal properties
• powder metallurgy

Acknowledgements

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support as well as Pratt & Whitney Canada (P&WC) for their financial, in-kind and technical support. They thank Thomas Georges and Josianne Coulombe of P&WC for their insight and guidance during this work. They would also like to thank Mike Johnson, Dalhousie University Department of Chemistry, for his support in conducting the PPMS measurements.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Notes on contributors

J. O’Flynn has an MASc in Mechanical Engineering from McGill University and is a Research Associate at Dalhousie University.

C.A. Whitman has a PhD in Chemisty from Dalhousie University and is a Research Associate at Dalhousie University.

S.F. Corbin has a PhD in Materials Engineering from McMaster University and is a Professor at Dalhousie University.

Additional information

Funding

This work was supported by Natural Sciences and Engineering Research Council of Canada.