Properties of thermally embrittled cast duplex stainless steel
- General Research Corp., Santa Barbara, CA (USA)
- California Univ., Santa Barbara, CA (USA)
- Electric Power Research Inst., Palo Alto, CA (USA)
The authors describe cast duplex stainless steel, grade CF-3, used in nuclear pump applications, thermally aged at 400{sup 0}C to induce an embrittling phase transformation, thereby simulating long term exposures at 280{sup 0}C (536{sup 0}F). The mechanical properties of as-cast material and the thermally aged materials were subsequently investigated. Fracture roughness, Charpy V-Notch (CVN), tensile, precracked CVN, nil-ductility transition temperature, and hardness tests were performed on these materials. Tests were run as a function of temperature and loading rate. The as-cast structure of this duplex stainless steel is extremely tough, but thermal aging causes a decrease in upper shelf fracture toughness parameters and absorbed Charpy energy, and a marked increase in transition temperature. However, even the most severely aged material (14406 hr/400{sup 0}C) appears to possess excellent upper shelf values, although the transition temperature shift is to a relatively high temperature. A conclusion is that cast duplex stainless steel is sufficiently tough, even in the aged condition, to resist crack initiation and propagation under expected nuclear pump service conditions.
- OSTI ID:
- 5155893
- Journal Information:
- Journal of Materials Engineering; (USA), Vol. 11:3; ISSN 0931-7058
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
NUCLEAR POWER PLANTS
PUMPS
MATERIALS TESTING
REACTOR COMPONENTS
STAINLESS STEELS
TENSILE PROPERTIES
CRACK PROPAGATION
DUCTILITY
EMBRITTLEMENT
HIGH TEMPERATURE
PHASE TRANSFORMATIONS
TRANSITION TEMPERATURE
ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NUCLEAR FACILITIES
PHYSICAL PROPERTIES
POWER PLANTS
STEELS
TESTING
THERMAL POWER PLANTS
THERMODYNAMIC PROPERTIES
220200* - Nuclear Reactor Technology- Components & Accessories
360103 - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies