원자력발전소용 316 스테인리스강 배관의 부식특성에 미치는유도가열벤딩공정의 영향

신민철; 김영식; 김경수; 장현영; 박흥배; 성기호

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자료유형: 학술저널

저자정보: 신민철 김영식 김경수 장현영 박흥배 성기호

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제13권 제3호

발행연도: 2014.1

수록면: 87 - 94 (8page)

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연구주제

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연구배경

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연구방법

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연구결과

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Recently, the application of bending products has been increased since the industries such as automobile, aerospace, ships, and plants greatly need the usage of pipes. For facility fabrication, bending process is one of key technologies for pipings. Induction heat bending process is composed of bending deformation by repeated local heat and cooling. Because of local heating and compressive strain, detrimental phasesmay be precipitated and microstructural change can be induced. This work focused on the effect of induction heat bending process on the properties of ASME SA312 TP316 stainless steel. Evaluation was done on the base metal and the bended areas before and after heat treatment. Microstructure analysis, intergranular corrosion test including Huey test, double loop electropotentiokinetic reactivation test, oxalic acid etch test,and anodic polarization test were performed. On the base of microstructural analysis, grain boundaries in bended extrados area were zagged by bending process, but there were no precipitates in grain and grain boundary and the intergranular corrosion rate was similar to that of base metal. However, pitting potentials of bended area were lower than that of the base metal and zagged boundaries was one of the pitting initiation sites. By re-annealing treatment, grain boundary was recovered and pitting potential was similar to that of the base metal.

#corrosion #316 stainless steel #induction heat bending #nuclear power plant

참고문헌 (16)

참고문헌 신청

/ 1994 / ASTM G108, Standard test method for electrochemical reactivation (EPR) for detecting sensitization of AISI type 30 and 304L stainless steels / ASTM

/ 2002 / ASTM A 262, Standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels / ASTM

/ 2010 / PFI Standard ES-24, Pipe Bending Methods, Tolerances, Process and Materials Requirements / Pipe Fabrication Institute

/ 2011 / ASME Boiler & Pressure Vessel Section II-Part A, Ferrous Materials Specifications

/ 2013 / Development of Applicable Induction Heating Bend and Reliability Verification Technology for Safety Related Piping (Class 1, 2, 3) / Sung Il SIM Co. Ltd