Creep deformation and mechanisms in Haynes 230 at 800°C and 900°C

Garrett J. Pataky, Huseyin Sehitoglu, Hans J. Maier

Research output: Contribution to journalArticlepeer-review


Creep was studied in Haynes 230, a material candidate for the very high temperature reactor's intermediate heat exchanger, at 800°C and 900°C. This study focused on the differences between the behavior at the two elevated temperature, and using the microstructure, grain boundary serrations and triple junction strain concentrations were quantitatively identified. There was significant damage in the 900°C samples and the creep was almost entirely tertiary. In contrast, the 800°C sample exhibited secondary creep. Using an Arrhenius equation, the minimum creep rate exponents were found to be n ≈ 3 and n ≈ 5 for 900°C and 800°C, respectively. The creep mechanisms were identified as solute drag for n ≈ 3 and dislocation climb for n ≈ 5. Strain concentrations were identified at triple junctions and grain boundary serrations using high resolution digital image correlation overlaid on the microstructure. The grain boundary serrations restrict grain boundary sliding which may reduce the creep damage at triple junctions and extend the creep life of Haynes 230 at elevated temperatures.

Original languageEnglish (US)
Pages (from-to)484-490
Number of pages7
JournalJournal of Nuclear Materials
Issue number1-3
StatePublished - 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


Dive into the research topics of 'Creep deformation and mechanisms in Haynes 230 at 800°C and 900°C'. Together they form a unique fingerprint.

Cite this