합금화용융아연도금강판의 미세파괴거동에 대한 In-situ 관찰

문현수; 부현덕; 추용호; 안병국; 김영근; 안행근; Hyun-Su Mun; Hyun-Duck Bu; Yong-Ho Chu; Byung-Kuk Ahn; Young-Geun Kim; Haeng-Keun Ahn

Korean Journal of Materials Research, Vol.14, No.9, 676-681, September, 2004

DOI10.3740/MRSK.2004.14.9.676 Export Citation

합금화용융아연도금강판의 미세파괴거동에 대한 In-situ 관찰

In-situ Observation on the Microfracture Behavior of Gavannealed Steel Sheet

문현수, 부현덕, 추용호, 안병국, 김영근¹, 안행근^†

전북대학교 신소재공학부
¹POSCO 기술연구소

Hyun-Su Mun, Hyun-Duck Bu, Yong-Ho Chu, Byung-Kuk Ahn, Young-Geun Kim¹, and Haeng-Keun Ahn^†

School of Advanced Materials Engineering, Research Center of Industrial Technology(RCIT), Engineering College, Chunbuk National University, 561-756, Korea
¹Technical Research Laboratories, POSCO, Kwangyang, Jeonnam, 545-711, Korea

E-mail:

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 Γ/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.

Keywords:coating layer of ga steel;in-situ observation in sem;flaking;exfoliation

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[3] Ghoniem MA, Lonhberg K, Metal, 26, 1026 (1972)

[4] Massalski TB, Binary Alloy Phase Diagrams, Metals Park, Ohio, ASM, 2, 1128 (1986) (1986)

[5] Nishimoto A, Inagaki J, Nakaoka K, Iron and steel, 72, 989 (1986)

[6] Saito M, Uchida Y, Kittka T, Hirose Y, Hisamatsu Y, Iron and steel, 77, 947 (1991)

[7] Urai M, Arimura M, Iron and steel, 81, 70 (1995)

[8] Adachi Y, Arai M, Nakamori T, Iron and steel, 80, 225 (1994)

[9] Morimoto Y, Nishimura K, CAMP-ISIJ, 9, 516 (1996)

[10] Kawabe J et al., Iron and steel, 69, S1060 (1983)

[11] Jordan CE, Goggins KM, Mader AR, Metal. Mater. Trans. A, 25A, 2101 (1983)

[12] Nakamori T, Shibuya A, Corrosion Resistant AutomotiveSheet Steel, ASM, 135 (1988) (1988)

[13] Chang S, Choi YM, J. of the Korean Inst. of Met. & Mater, 31, 1241 (1993)

[14] Lin CS, Meshii M, Proc. of Galvatech' 95 ISS, 477 (1995) (1995)

[15] Katz W, Arch. Eisenhuttenwes, 25, 307 (1954)

[16] Katz W, Stahl Eisen, 75, 1106 (1955)

[17] Peppler W, Proc. 5th Inter. Conf. on Hot Dip Galvanizing, 273 (1958)