Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Hydrogen Embrittlement Resistance and Diffusible Hydrogen Desorption Behavior of Multipass FCA Weld Metals

다층 FCA 용착금속의 수소취성 저항성 및 확산성 수소 방출 거동

  • Yoo, Jaeseok (National Core Research Center, Pusan National University) ;
  • Xian, Guo (Dept. of Materials Science and Engineering, Pusan National University) ;
  • Lee, Myungjin (Dept. of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yongdeok (Research and Development Center, Hyundai Welding Co., Ltd.) ;
  • Kang, Namhyun (Dept. of Materials Science and Engineering, Pusan National University)
  • 유재석 (부산대학교 하이브리드소재 솔루션 국가핵심연구센터) ;
  • 곽현 (부산대학교 재료공학과) ;
  • 이명진 (부산대학교 재료공학과) ;
  • 김용덕 (현대종합금속 기술연구소) ;
  • 강남현 (부산대학교 재료공학과)
  • Received : 2013.12.13
  • Accepted : 2013.12.20
  • Published : 2013.12.31
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Abstract

In this study, constant loading test (CLT) was performed to evaluate the hydrogen embrittlement resistance for multipass FCA weld metals of 600MPa tensile strength grade. The microstructures of weld metal-2 having the smallest carbon equivalent (Ceq=0.37) consisted of grain boundary ferrite and widmanstatten ferrite in the acicular ferrite matrix. The weld metal-1 having the largest Ceq=0.47, showed the microstructures of grain boundary ferrite, widmanstatten ferrite and the large amount of bainite (vol.%=19%) in the acicular ferrite matrix. The weld metal-3 having the Ceq=0.41, which was composed of grain boundary ferrite, widmanstatten ferrite, and the small amount of bainite (vol.%=9%) in the acicular ferrite matrix. Hydrogen desorption spectrometry (TDS) used to analyze the amount of diffusible hydrogen and trapping site for the hydrogen pre-charged specimens electrochemically for 24 hours. With increasing the current density of hydrogen pre-charging, the released amount of diffusible hydrogen was increased. Furthermore, as increasing carbon equivalent of weld metals, the released diffusible hydrogen was increased. The main trapping sites of diffusible hydrogen for the weld metal having a low carbon equivalent (Ceq=0.37) were grain boundaries and those of weld metals having a relatively high carbon equivalent (Ceq: 0.41~0.47) were grain boundaries and dislocation. The fracture time for the hydrogen pre-charged specimens in the constant loading test was decreased as the carbon equivalent increased from 0.37 to 0.47. This result is mainly due to the increment of bainite that is vulnerable to hydrogen embrittlement.

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References

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