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LNG 저장탱크 내조용 9% Ni강의 SAW 용접열영향부내 파괴인성 변화 평가
장재일,이정석,이백우,주장복,권동일,김우식,Jang, Jae-Il,Lee, Jeong-Seok,Lee, Baek-U,Ju, Jang-Bok,Gwon, Dong-Il,Kim, U-Sik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.3
As one step for the safety performance of LNG storage tank, the change in fracture toughness within the X-grooved weld heat-affected zone (HAZ) of newly developed 9% Ni steel, which was submerged arc (SA)-welded, was investigated. Both crack initiation fracture toughness and crack arrest fracture toughness were evaluated by the crack tip opening displacement (CTOD) tests and compact crack arrest (CCA) tests. As the evaluated region approached the fusion line, each test result shorted different tendency, that is, crack initiation toughness decreased while crack arrest toughness increased. The results were discussed through the observation of the microstructural change.