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해양구조용강재의 SA용접부에서 입열량이 파괴인성에 미치는 영향에관한 실험적 연구

The Effect of Heat Input on Fracture Toughness(CTOD) in Submerged ArcOffshore Steel Weldments

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참고문헌

주제분류조선공학

초록

Abstract

The influence of heat input on fracture toughness was investigated in SAW weldments, which were prepared at two different welding conditions in API 2W Gr.50 and EN10225 S420. By examining the fracture initiation point, refined areas(ICHAZ and SCHAZ) in weld metal was identified as local brittle zone, in which M-A constituents and coarsed grain size were observed. Impact values showed the most significant difference at root portion, and CTOD transition temperature was related with impact values obtained at root portion. Hardness values in refined area were less than columnar microstructure about 20 HV5.

참고문헌 (9)

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  7. "Effect of crack front curvature and side grooving on CTOD δ5 and J-integral in CT and 3PB specimens", 17(5), pp.312~319 (1999)
  8. "Microstructure", mechanical property relationship of submergedarc welds in HSLA 80 steel, 1989, pp.68, 112~120
  9. "Influence of Mn and Ni on the microstructure and toughness of C-Mn-Ni weld metals", 76(5), pp.183~190 (1997)

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