Effect of boron on post irradiation tensile properties of reduced activation ferritic steel (F-82H) irradiated in HFIR

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/195650· OSTI ID:195650

Shiba, Kiyoyuki; Suzuki, Masahide; Hishinuma, Akimichi ^[1]; Pawel, J E ^[2]

---

1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Dept. of Materials Science and Engineering
2. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Reduced activation ferritic/martensitic steel, F-82H (Fe-8Cr-2W-V-Ta), was irradiated in the High Flux Isotope Reactor (HFIR) to doses between 11 and 34 dpa at 400 and 500 C. Post irradiation tensile tests were performed at the nominal irradiation temperature in vacuum. Some specimens included {sup 10}B or natural boron (nB) to estimate the helium effect on tensile properties. Tensile properties including the 0.2% offset yield stress, the ultimate tensile strength, the uniform elongation and the total elongation were measured. The tensile properties were not dependent on helium content in specimens irradiated to 34 dpa, however {sup 10}B-doped specimens with the highest levels of helium showed slightly higher yield strength and less ductility than boron-free specimens. Strength appears to go through a peak, and ductility through a trough at about 11 dpa. The irradiation to more than 21 dpa reduced the strength and increased the elongation to the unirradiated levels. Ferritic steels are one of the candidate alloys for nuclear fusion reactors because of their good thermophysical properties, their superior swelling resistance, and the low corrosion rate in contact with potential breeder and coolant materials.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Japan Atomic Energy Research Inst., Tokyo (Japan)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 195650
• Report Number(s): CONF-940657--11; ON: DE96005426
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BORON
BORON ADDITIONS
CHEMICAL COMPOSITION
ELONGATION
EXPERIMENTAL DATA
FERRITIC STEELS
INTERSTITIAL HELIUM GENERATION
MARTENSITIC STEELS
METALLURGICAL EFFECTS
PHYSICAL RADIATION EFFECTS
THERMONUCLEAR REACTOR MATERIALS
ULTIMATE STRENGTH
YIELD STRENGTH