Exploratory investigations of low Charpy-V upper shelf energy steels with irradiation. Final report
Steel plates and weld deposits exhibiting relatively low Charpy-V C sub v upper-shelf energy levels in the preirradiation condition are present in certain older reactor pressure vessels. Because the postirradiation notch ductility behavior of such materials is not well understood, a series of investigations has been undertaken for representative compositions. Forgings typical of older steel production are also being studied to develop specific trend information. This report describes exploratory investigations with a low upper-shelf A302-B plate, a companion weld heat-affected zone (HAZ), a low upper-shelf A533-B weld and an A508-2 forging which exhibited a high C sub v energy correlation (>135 J, 100 ft lb) at the drop-weight nil-ductility transition (NDT) temperature. Standard C sub v and fatigue-precracked C sub v specimens were employed for notch ductility and dynamic fracture toughness K sub j determinations, respectively. The studies indicated: (1) approximately equal radiation effects to longitudinal and transverse test orientations for the plate, (2) a significantly lower C sub v upper-shelf level for the HAZ compared to the parent plate, (3) greater radiation sensitivity by the HAZ compared to the parent plate as evidenced by transition-temperature elevation, (4) a postirradiation upper-shelf energy for the weld below the code index value of 68 J (50 ft.lb) minimum, and (5) a trend in fracture toughness versus C sub v upper-shelf energy suggestive of a correspondence in these properties.
- Research Organization:
- Naval Research Lab., Washington, DC (USA)
- OSTI ID:
- 6561177
- Report Number(s):
- AD-A-055914; NRL-8171
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360106 -- Metals & Alloys-- Radiation Effects
ALLOYS
CONTAINERS
DUCTILITY
EMBRITTLEMENT
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MECHANICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
PRESSURE VESSELS
RADIATION EFFECTS
STEEL-ASTM-A302
STEEL-ASTM-A508
STEEL-ASTM-A533
STEELS
TENSILE PROPERTIES
WELDED JOINTS