Helium effects on the reweldability and low cycle fatigue properties of welded joints for type Cr16Ni11Mo3Ti and 316L(N) stainless steels

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:524842

Fabritsiev, S A ^[1]; Laan, J.G. van der ^[2]

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1. D.V. Efremov Inst. of Electrophysical Apparatus, St. Petersburg (Russian Federation)
2. Netherlands Energy Research Foundation, Petten (Netherlands)

The feasibility of welding neutron irradiated modules and tubes for repair or replacement purposes is one of the key problems in life time estimates for austenitic steel, intended for use as structural material in the first wall , blanket and vacuum vessel of the International Thermonuclear Experimental Reactor (ITER). Here, the reweldability of austenitic alloys has been studied for flat specimens of Cr16Ni11Mo3Ti (Russian) and 316L(N)-SPH (European Union) which have been implanted with helium using cyclotron facilities. Specimens with typical thicknesses of 1 mm have been implanted up the helium concentrations of 50, 100, 300 and 860 appm on both sides. Electron beam welding of Cr16Ni11Mo3Ti resulted in weld cracking for specimens with the highest helium concentration of 860 appm, unlike the 316L-SPH material in similar conditions. A reduction in fatigue life in low cycle fatigue was found to be more significant for welded joints of Cr16Ni11Mo3Ti material.

• OSTI ID: 524842
• Report Number(s): CONF-940657--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CRACK PROPAGATION
FATIGUE
INTERSTITIAL HELIUM GENERATION
ION IMPLANTATION
PHYSICAL RADIATION EFFECTS
STAINLESS STEEL-316L
THERMONUCLEAR REACTOR MATERIALS
WELDABILITY
WELDED JOINTS