The feasibility of welding of irradiated materials
- Oak Ridge National Lab., TN (USA)
Helium was implanted into solution-annealed (SA) 316 stainless steel, 20% cold-worked (CW) 316 stainless steel and titanium-modified Primary Candidate Alloy (PCA) through tritium decay to levels ranging from 0.18 to 256 appm. Full penetration welds were then made on helium-doped materials using gas tungsten arc welding (GTAW) under fully constrained conditions. Intergranular heat-affected zone (HAZ) cracking was observed in all of the materials containing greater than 1 appm He. Electron microscopy showed that the HAZ cracking originated from the growth and coalescence of grain boundary (GB) helium bubbles. Bubble growth kinetics in the HAZ is explained by stress-enhanced diffusive cavity growth. Results suggest that the propensity for HAZ cracking can be reduced by the preexisting cold-worked structure and by finely-distributed MC precipitates that refine the distribution of helium bubbles and minimize the flow of vacancies in grain boundaries. 16 refs., 3 figs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5453838
- Report Number(s):
- CONF-891204-4; ON: DE90002200; TRN: 89-031685
- Resource Relation:
- Conference: 4. international conference on fusion reactor materials, Kyoto (Japan), 4-8 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
STAINLESS STEEL-316
WELDABILITY
COLD WORKING
CRACKS
GAS TUNGSTEN-ARC WELDING
GRAIN BOUNDARIES
HEAT AFFECTED ZONE
HELIUM EMBRITTLEMENT
IRRADIATION
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
PRECIPITATION
TRITIUM
VACANCIES
ALLOYS
ARC WELDING
AUSTENITIC STEELS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
EMBRITTLEMENT
FABRICATION
HEAT RESIS
HIGH ALLOY STEELS
HYDROGEN ISOTOPES
IRON ALLOYS
IRON BASE ALLOYS
ISOTOPES
JOINING
LIGHT NUCLEI
MATERIALS WORKING
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUCLEI
ODD-EVEN NUCLEI
POINT DEFECTS
RADIATION EFFECTS
RADIOISOTOPES
SEPARATION PROCESSES
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
WELDING
YEARS LIVING RADIOISOTOPES
ZONES
700209* - Fusion Power Plant Technology- Component Development & Materials Testing
360101 - Metals & Alloys- Preparation & Fabrication
360106 - Metals & Alloys- Radiation Effects