Effect of neutron irradiation on sequential creep-fatigue interaction of /sup 18/Cr-/sup 11/Ni (DIN 1. 4948) stainless steel plate and welded joints at 823 K

Technical Report · Mon Oct 01 00:00:00 EDT 1979

OSTI ID:7063822

Schaaf, B v.d.; de Vries, M I; Elen, J D

Neutron fluence amounted to 10 to the 23rd power n.1/sq m (E>0.1 MeV). Creep exposures lasted up to 4100 h. Low cycle fatigue testing was carried out with a total strain range of 0.6% and a strain rate of 3* 1/1000/s. The data are required for design and safety analysis of permanent structures such as: reactor vessel and shield tank of the fast breeder reactor SNR-300. With increasing creep damage prior to fatigue the number of fatigue cycles to failure is decreasing. For parent metal the fatigue fraction of 0.5 is not exceeded, due to the early initiation of fatigue cracks at intergranular creep cracks. The creep cracks serving as starter cracks for fatigue in welds are formed in or near the root bead. With increasing fatigue damage prior to creep the times to rupture are increasing up to fatigue fractions of 0.5. After higher fatigue fractions the times to rupture rapidly decrease. In the irradiated condition the creep stresses needed to accumulate a certain amount of creep damage in a certain time are 50 MPa lower than in the unirradiated condition. For welded joints the amount is 30 MPa. Creep ductility after irradiation is decreased by a factor 5.

• Research Organization: Netherlands Energy Research Foundation, Petten
• OSTI ID: 7063822
• Report Number(s): PB-80-170475
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM-NICKEL STEELS
PHYSICAL RADIATION EFFECTS
CREEP
FATIGUE
HIGH TEMPERATURE
METALLOGRAPHY
PLATES
STAINLESS STEELS
WELDED JOINTS
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MECHANICAL PROPERTIES
NICKEL ALLOYS
RADIATION EFFECTS
STEELS
360106* - Metals & Alloys- Radiation Effects