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선박·해양 구조물용 YS 460MPa 강재 FCAW 용접금속의 강도와 인성에 미치는 C의 영향
정상훈,엄정호,최한글,정병호,허성화,강창룡,Jeong, Sang-Hoon,Eom, Jeong-Ho,Choi, Han-Geul,Jeong, Byung-Ho,Hur, Sung-Hwa,Kang, Chang-Yong 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.6
This paper has an purpose to study the effect of C on the toughness of YS 460 MPa FCAW weld metal. These effects were evaluated by charpy impact and CTOD test about 4 FCAW weld metal containing various C and Si content in relation to microstructure. Increase of C content was helpful to increase AF volume fraction and reduce PF(G) and FS volume fraction by increasing super cooling rate for ferrite transformation. Also, Increase of C content up to 0.045wt% made the strength and impact toughness higher by increasing AF volume fraction. The weld metal containing higher C content indicated higher CTOD value. It is because the volume fraction of PF(G) and FS, can play a role as crack initiation site, was reduced. Effect of C on the strength and elongation of weld metal was higher with an increase of Si contents.
용접 자세에 따른 해양구조물용 항복강도 420MPa급 고강도강 FCA 용접부 파괴인성에 대한 연구
김인찬(In-Chan Kim),정상훈(Sang-Hoon Jeong),최한글(Han-Geul Choi),김명현(Myung-Hyun Kim) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.2
The fracture toughness of flux cored arc weld metal with the yield strength 420MPa grade high strength steels for offshore structures depending on the welding position was investigated. Charpy V-notch impact test and the CTOD test of the weld metal in the horizontal and the vertical-up welding positions were carried out, and the microstructure and M-A constituents of the weld metals were observed. The recovery rate of alloying elements in horizontal position weld metal were higher than vertical-up position weld metal and the fraction of low temperature transformation phases having high dislocation density in the horizontal position weld metal was high. As a result, the yield strength, tensile strength and impact toughness of horizontal weld metal were higher than those of vertical-up position weld metal. On the other hand, the CTOD value of vertical-up position weld metal was much higher than horizontal position weld metal. This is because the M-A constituents transformation is promoted by the post-welding on the low temperature transformation region having a high local C concentration in the horizontal position welding, and therefore, the breakdown starts easily by the high M-A constituents.