Processing of TRIP steels in continuous galvanizing lines: Surface and subsurface oxidation study

Y. F. Gong, S. Birosca, Han S. Kim, B. C. De Cooman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

New Advanced High Strength Steels (AHSS) are formable high strength steels which allow for the design of car bodies with an improved passenger safety combined with a lower weight. The galvanizability of AHSS such as TRIP (TRansformation-Induced Plasticity) steel is a key factor to promote this trend as thinner gauge AHSS sheet is being used which must be resistant to perforation corrosion. The gas atmosphere in continuous annealing and galvanizing lines alters both composition and microstructure of the surface and subsurface of sheet steels. The enrichment and oxidation of alloying elements on TRIP steel surfaces are strongly influenced by the dew point of the atmosphere during annealing. Selective or internal oxidation during this process may result in surface defects on hot dip galvanizing products. The present contribution reviews the recent progress in the understanding of the surface and subsurface oxidation during annealing in hot dip galvanizing and continuous annealing lines. In the present study, microanalysis techniques such as Field Emission Scanning Electron Microscope (FE- SEM), Energy Dispersive X-ray Spectrometer (EDS) and Glow Discharge Optical Emission Spectrometry (GDOES) were employed for the detailed surface analysis of oxide phases and surface microstructure of annealed TRIP steel. The processes of selective oxidation on the surface and subsurface of TRIP steels were investigated at extremely low atmosphere dew points and a wide range of annealing temperatures.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Pages514-524
Number of pages11
Volume1
DOIs
Publication statusPublished - Sep 2007
EventMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems" - Detroit, MI, United States
Duration: 16 Sep 200720 Sep 2007

Publication series

NameMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Volume1

Conference

ConferenceMaterials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"
Country/TerritoryUnited States
CityDetroit, MI
Period16/09/0720/09/07

Keywords

  • Dew point
  • Galvanizing
  • Internal oxidation
  • Selective oxidation
  • TRIP

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