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감육 저항 및 비저항성 재료 용접부에서 가속 두께감소 분석
박치용(Chi-Yong Park),이성호(Sung-Ho Lee),김태룡(Tae-Ryong KIM),류인근(In-Kun Ryu),이상열(Sang-Ryoul LEE) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In has been observed that there seems to be accelerated corrosion of carbon steel immediately downstream of flow-accelerated corrosion(FAC) resistant materials. This type of damage has been observed at a number of nuclear power plant. An enhanced corrosion rate is experienced at the transition from the resistant to the non-resistant. This phenomenon is analogous to the entrance effect that occurs in heat transfer. This paper will demonstrate and testify the entrance-like effect by mass transfer and flow analysis. Various parameters such as flow velocity, corrosion track of downstream region and weld crown has been investigated by the coupled analysis of mass transfer and flow. The entrance-like effect has been observed at the bimetal weld region between resistant and non0resistant material. The enhancement of FAC rate has been also investigated. It was addressed that enhanced thickness reduction may be considered to management and inspection of thinned pipe.