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    12th International Conference on Zinc & Zinc Alloy Coated Steel Sheet - GALVATECH 2021

    21–23 Jun 2021 Virtual Conference
    Virtuel Conference
    Europe/Vienna timezone
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    Session

    Steel-Coating Interfacial Layer and Coating Phase Developments

    21 Jun 2021, 14:00
    Virtuel Conference

    Virtuel Conference

    Conveners

    Steel-Coating Interfacial Layer and Coating Phase Developments

    • Thomas Mörtlbauer (voestalpine)

    Presentation materials

    There are no materials yet.

    1. 133. FORMATION SEQUENCE OF Fe-Al INTERMETALLIC PHASES IN HOT-DIP Zn-Al-Mg ALLOY GALVANIZED STEELS
      Naoki Takata (Nagoya University)
      21/06/2021, 14:00
      Fundamentals on Solid - Liquid Interfacial Reactions
      Oral Presentation
      In the present study, we characterized the Fe–Al intermetallic phases formed in interstitial-free (IF) steel hot-dipped in a Zn–6Al–3Mg (wt%) alloy melt at different temperatures (400, 460 and 500°C) and dipping times (from 2 to 3600 s). Chemical composition analyses indicated Fe dissolution into the Zn alloy melt even after 2 s of dipping. Microstructural characterization revealed the initial...
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    2. 35. QUANTITATIVE EVALUATION OF NANOSCALE MECHANICAL PROPERTIES OF Zn-Al AND Zn-Al-Mg COATINGS ON STEEL SHEET BY NANOINDENTATION
      Franck Nozahic (ArcelorMittal Global R&D Ghent)
      21/06/2021, 14:20
      Structure and Surface Analysis as well as Defect Characterization
      Oral Presentation

      While mechanical properties of zinc coatings are well-known and have been studied in detail during the last decades [1,2], the fundamental behaviour of coatings of zinc- or aluminium-based alloys is much less understood. Understanding the contribution of the different micro-phases in their complex solidification structure requires new approaches.

      Nanoindentation coupled with data...

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    3. 72. IN-SITU OBSERVATION OF THE CRYSTALLIZATION AND GROWTH BEHAVIOR OF Fe-Zn INTERMETALLIC COMPOUND ("BOTTOM DROSS") IN THE MOLTEN ZINC USING X-RAY TRANSMISSION IMAGING METHOD
      Ryo Sasaki (kobe steel, ltd.)
      21/06/2021, 14:40
      HDG Process Technology - Furnace, Galvanizing Bath, Coating Weight Control
      Oral Presentation
      “Dross” is solid intermetallic compound generated in molten zinc baths of CGL, and it can be the cause of surface defects of hot dip galvanized steel sheets. Their behavior in the molten zinc such as thermochemical stability is well investigated before, but its crystallization or growth behavior is not understood yet because their reaction occurs in high-temperature and opaque molten zinc. In...
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    4. 66. STRUCTURAL AND MECHANICAL CHARACTERIZATIONS OF TOP DROSS IN A MOLTEN ZINC BATH
      Takeshi Konishi (Nippon Steel)
      21/06/2021, 15:00
      Structure and Surface Analysis as well as Defect Characterization
      Oral Presentation
      In a molten zinc bath in a continuous galvanizing line, top dross particles crystallize as Fe-Al-Zn intermetallic compounds. These par¬ticles easily adhere to the steel sheets causing surface defects. Therefore, controlling the top dross particles is a key issue. The present study focused on the structural and mechanical characterizations of top dross particles using an electron probe micro...
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    5. 131. INVESTIGATION OF ORANGE PEEL DEFECT ON GALVANIZED DP STEEL SHEET
      Lei Cui (Maanshan Iron & Steel Company Ltd,)
      21/06/2021, 15:20
      Challenges in Galvanizing Advanced High Strength Steels (GI, GA,…)
      Oral Presentation

      With the increasing use of galvanized high-strength steel sheets in automobiles, the surface quality requirements of galvanized sheets are also increasing. When hot-dip galvanized C-Si-Mn dual-phase steel (such as DP600~DP1000) is produced, a serious orange peel-like rough surface defect appears on the surface of the steel sheet, which is mainly found in the middle area of the middle section...

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