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Formation of Γ Phase on Hot-Dip Galvanized Coating Steel Sheet after Various Heat Treatment

Published online by Cambridge University Press:  02 July 2020

Yuli Lin  and
Hwang-Che Lin
Yuli Lin
Affiliation:
Department of Mechanical Engineering Chua-Hwa University, Hsinchu, Taiwan, ROC
Hwang-Che Lin
Affiliation:
Department of Mechanical Engineering Chua-Hwa University, Hsinchu, Taiwan, ROC
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Extract

Among those intermetallic phases in Zn-Fe system formed in the hot-dip galvanized coating and/or galvanneal coating, the microstructure of Γ phase was the least mentioned. The Γ phase form in the coating layer is usually too thin to observe by a microscope. However, it has been reported that the performance of coating is closely related to the microstructure of Γ phase. Tokunaga et al. has reported that the cracks were generated from the Γ layer or Γ+δ layer. Y.Lin et al. demonstrates that coherent interface forms between Γ and steel interface on annealed electrogalvanized steel sheets indicating that failure would not occur at this interface.

Samples used in this study were lab-made hot-dip galvanized steel sheets. To investigate the microstructure of coating, especially the Γ phase layer, specimens were heated to create the designed layer interface. It was found that the heat-treated conditions ranged from 700°C to 750°C for one hour was appropriate to observe the nucleation and growth of Γ phase layer.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 878 - 879
Copyright
Copyright © Microscopy Society of America

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References

1. Tokunaga, YM.et al., J. ISIJ, 1986, p997-1004.Google Scholar

2. Lin, Y.et al.,Surface Modification VI, Sudarshan, T.S., Braza, J.F., eds., 1993, p391-399.Google Scholar

3. This research is supported by NSC 88-2212-E216-005.Google Scholar