In-situ observation in a scanning electron microscope on the exfoliation behavior of galvannealed Zn-Fe coating layers

Kyung Keun Lee, In-Hwan Lee, Cheul Ro Lee, Haeng Keun Ahn

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Exfoliation behavior of galvannealed (GA) coating layers was continuously observed in-situ under 3-point bending load in a scanning electron microscope (SEM). Two kinds of substrate, Al-killed steel and Ti-stabilized interstitial free (IF) steel, were used. For GA coating layers formed on Al-killed steel, powdering was dominant at the region under compressive stress during the bending. Exfoliation occurred at the Γ/δ1 interface, and the amount of exfoliation decreased with an increase in Fe content in the coating layer. Meanwhile, for GA layers coated on IF steel substrate, flaking was dominant. One of the perpendicular cracks that were pre-induced during galvannealing grew and propagated up to the Γ/Fe matrix interface with increasing strain. On the other hand, the crack initiated at the Γ/Fe matrix interface grew and propagated along the interface. Then, this crack combined with a nearby perpendicular crack, resulted in flaking.

Original languageEnglish
Pages (from-to)6261-6266
Number of pages6
JournalSurface and Coatings Technology
Volume201
Issue number14
DOIs
Publication statusPublished - 2007 Feb 4
Externally publishedYes

Keywords

  • C. Hot dip
  • D. Multilayer
  • D. Zinc alloy
  • X. Exfoliation

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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