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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 305 - 316 (12page)
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초록· 키워드
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Austenitic stainless steels have been widely used for various systems of nuclear power plants. Among thesestainless steels, small pipes with diameter less than 14 inch have been produced in the form of seamlesspipe. Annealing and cooling process during the manufacturing process can affect corrosion properties ofseamless stainless steels. Therefore, 12 inch-diameter of as-received 304L stainless steel pipe was annealedand aged in this study. Intergranular corrosion resistance was evaluated by ASTM A262 Practice A, C,and E methods. The degree of sensitization was determined using a DL-EPR test. U-bend method in anautoclave was used to evaluate the SCC resistance in 0.01 M Na2S4O6 or 40% NaOH solution at 340 °C.
As-received specimen showed relatively high degree of sensitization and intergranular corrosion rate. Carbonsegregation was also observed near grain boundaries. Annealing treatment could give the dissolution ofsegregated carbon into the matrix. Aging treatment could induce segregation of carbon and finally formcarbides. Microstructural analysis confirmed that high intergranular corrosion rate of the as-received seamlesspipe was due to micro-galvanic corrosion between carbon segregation and grains.
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