Thermal failure of a nickel-base superalloy containing carbonate eutectic salt

Sarvghad, Madjid, Luker, Elaiza, Bell, Stuart, Raud, Ralf, Steinberg, Theodore, & Will, Geoffrey (2015) Thermal failure of a nickel-base superalloy containing carbonate eutectic salt. In 2015 Asia-Pacific Solar Research Conference, 8-10 December 2015, Brisbane, Qld.

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Abstract

An Inconel 601 crucible containing a ternary eutectic mixture of lithium carbonate (Li2CO3), potassium carbonate (K2CO3) and sodium carbonate (Na2CO3) was placed into a 450°C preheated furnace to check their compatibility as storage and containment materials for Thermal Energy Storage (TES) applications. Failure was observed after around 22 hours and proved to be assisted by the diffusion of oxygen and carbide forming elements through grain boundaries. Microstructural studies showed cracks of an intergranular type resulted from the high amount of residual stress and microstructural evolution during the thermal exposure; EBSD investigations confirmed the occurrence of partial recovery leading to stress reduction in the matrix. The failure of this nickel-based superalloy crucible was concluded to be a combination of stress induced by sensitization, exposure to hot corrosive media, and cold work manufacturing besides thermal instability of the microstructure.

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ID Code: 95796
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
  • ASTRI/P-22
Copyright Owner: Copyright 2015 [Please consult the author]
Deposited On: 26 May 2016 23:01
Last Modified: 01 Jul 2017 14:46

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