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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Materials and Chemistry for Molten Salt Systems
Presentation Title Impact of exposure time and temperature on stress corrosion cracking behavior of Hastelloy-N in molten fluoride salt
Author(s) Isabelle Heintz, Zachary Harris
On-Site Speaker (Planned) Isabelle Heintz
Abstract Scope The objective of this study is to quantify the influence of exposure time, temperature, and applied stress intensity factor (K) on the stress corrosion cracking (SCC) susceptibility of Hastelloy-N in molten FLiNaK. Fatigue pre-cracked compact tension (C(T)) specimens were wedge-loaded in laboratory air at ambient temperature to target K levels between 30 and 45 MPa√m, followed by exposure to either an inert argon gas environment or molten FLiNaK at temperatures between 550℃ and 700℃ for times up to 500 hrs. Post-exposure, each specimen was removed and cleaned, then bisected via electric discharge machining with one half mounted for cross-sectional characterization of the near-crack region and the other half fast fractured for characterization of the fracture surface. Results reveal distinct differences between the argon and molten FLiNaK-exposed specimens, with clear intergranular fracture noted in the latter. These results are interpreted based on observed differences in near-crack deformation and elemental composition.
Proceedings Inclusion? Planned:
Keywords Nuclear Materials, Environmental Effects, Mechanical Properties

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