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http://dx.doi.org/10.3795/KSME-A.2006.30.10.1173

A Study on Fracture Toughness with Thermal Aging in CF8M/SA508 Welds  

Woo Seung-Wan (영남대학교 기계공학부)
Choi Young-Hwan (한국원자력안전기술원)
Kwon Jae-Do (영남대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.30, no.10, 2006 , pp. 1173-1178 More about this Journal
Abstract
In a primary reactor cooling system(RCS), a dissimilar weld zone exists between cast stainless steel(CF8M) in a pipe and low-alloy steel(SA508 cl.3) in a nozzle. Thermal aging is observed in CF8M as the RCS is exposed for a long period of time to a reactor operating temperature between 290 and $330^{\circ}C$, while no effect is observed in SA508 cl.3. The specimens are prepared by an artificially accelerated aging technique maintained for 300, 1800 and 3600 hrs at $430^{\circ}C$, respectively. The specimens for elastic-plastic fracture toughness tests are according to the process in the thermal notch is created in the heat affected zone(HAZ) of CF8M and deposited zone. From the experiments, the $J_{IC}$ value notched in HAZ of CF8M presented a rapid decrease up to 300 hours at $430^{\circ}C$ and slowly decreased according to the process in the thermal aging time. Also, the $J_{IC}$ value presented a lower value than that of the CF8M base metal. And, the $J_{IC}$ of the deposited zone presented the lowest value of all other cases.
Keywords
Cast Stainless Steel; Low Alloy Steel; Dissimilar Weld; Thermal Aging; Fracture Toughness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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