SYMPOSIA PAPER Published: 01 January 1985

In-Reactor Creep of Selected Ferritic Alloys


In-reactor creep data to a peak fluence of 5.7 × 1022 neutrons (n)/cm2 (E > 0.1 MeV) for irradiation temperatures between 380 and 570°C have been obtained for the ferritic alloys HT9, 9Cr-1Mo, and 2¼Cr 1Mo. Also, in-reactor creep data for HT9 has been obtained at 650°C at a fluence of 2.9 × 1022 n/cm2 (E > 0.1 MeV). For irradiation temperatures less than 520°C, the creep strains for all ferritic alloys are small and less than predicted for 20% cold-worked Type 316 stainless steel. At 570°C, thermal creep mechanisms become important and 2¼Cr-1Mo loses its creep resistance. HT9 loses its creep resistance at 650°C and exhibits large diametral strains (>24%).

Author Information

Puigh, RJ
Westinghouse Hanford Company, Richland, WA
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Developed by Committee: E10
Pages: 7–18
DOI: 10.1520/STP37349S
ISBN-EB: 978-0-8031-4935-9
ISBN-13: 978-0-8031-0450-1