The Effect of Bi on the Selective Oxide Formation on CMnSi TRIP Steel

The Effect of Bi on the Selective Oxide Formation on CMnSi TRIP Steel

The effect of Bi addition on the selective oxidation and the galvanizability of CMnSi transformation-induced plasticity (TRIP) steels was studied by hot dip galvanizing laboratory simulations. Bi-added TRIP steels were intercritically annealed at 1093 K (820 °C) and galvanized in a 0.22 wt pct Al-co...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-11, Vol.47 (11), p.5474-5486
Hauptverfasser: Oh, Jonghan, Cho, Lawrence, Kim, Myungsoo, Kang, Kichul, De Cooman, Bruno C.
Format: Artikel
Sprache:eng
Schlagworte:
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Galvanizing
Materials Science
Metallic Materials
Metallurgy
Morphology
Nanotechnology
Oxidation
Oxides
Physical metallurgy
Steel
Structural Materials
Studies
Surface layer
Surfaces and Interfaces
Thin Films
Transmission electron microscopy
TRIP steels
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Zusammenfassung:The effect of Bi addition on the selective oxidation and the galvanizability of CMnSi transformation-induced plasticity (TRIP) steels was studied by hot dip galvanizing laboratory simulations. Bi-added TRIP steels were intercritically annealed at 1093 K (820 °C) and galvanized in a 0.22 wt pct Al-containing Zn bath. The oxide morphology was investigated by scanning electron microscopy, transmission electron microscopy, and 3D atom probe tomography. Bi formed a Bi-enriched surface layer during the intercritical annealing. A decrease of the oxygen permeability was observed with increasing Bi addition. The internal oxidation was suppressed in Bi-added CMnSi TRIP steel. The surface oxide morphology was changed from a continuous layer morphology to a more lens-shaped morphology. The galvanizability of the Bi-added TRIP steel was improved by the combination of the change of the oxide morphology and the dissolution of the Bi-enriched surface layer during immersion of the strip in the Zn bath.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-016-3735-9