Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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In-situ Observation on the Microfracture Behavior of Gavannealed Steel Sheet

합금화용융아연도금강판의 미세파괴거동에 대한 In-situ 관찰

  • Mun Hyun-Su (School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University) ;
  • Bu Hyun-Duck (School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University) ;
  • Chu Yong-Ho (School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University) ;
  • Ahn Byung-Kuk (School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University) ;
  • Kim Young-Geun (Technical Research Laboratories, POSCO) ;
  • Ahn Haeng-Keun (School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University)
  • 문현수 (전북대학교 신소재공학부) ;
  • 부현덕 (전북대학교 신소재공학부) ;
  • 추용호 (전북대학교 신소재공학부) ;
  • 안병국 (전북대학교 신소재공학부) ;
  • 김영근 (POSCO 기술연구소) ;
  • 안행근 (전북대학교 신소재공학부)
  • Published : 2004.09.01
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Abstract

In-situ observation in SBM on the microfracture behavior of coating layer was performed for GA steel sheets that have various Fe contents and thickness of coating layer. In case of cross sectional side of coating layer that was in a tensile stress state during bending, fine perpendicular crack pre-induced during galvannealing grew and propagated rapidly toward the coating surface with the increase of strain. And then it grew and propagated along the ${\Gamma}/Fe$ matrix interface, and combined with the nearest another perpendicular crack. Consequently, flaking occurred. The more Fe content and thickness of coating layer increased, the more average crack interval and flaking resistivity increased. Exfoliation was little observed at coating surface in a tensile stress state.

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References

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