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Metallurgical and Materials Transactions A

, Volume 45, Issue 11, pp 5158–5172 | Cite as

On the Transition of Internal to External Selective Oxidation on CMnSi TRIP Steel

  • Lawrence Cho
  • Geun Su Jung
  • Bruno C. De Cooman
Article

Abstract

The selective oxidation of a CMnSi transformation-induced plasticity (TRIP) steel during intercritical annealing (IA) in a N+ 10 pct H2 gas atmosphere with a dew point (DP) in the range from 213 K to 278 K (−60 °C to +5 °C) was investigated by transmission electron microscopy. The decarburization during IA resulted in a fully ferritic matrix at the TRIP steel surface. Annealing in high DP gas atmospheres resulted in a reduction of the oxide layer thickness at the surface and an increase of the depth of the subsurface internal oxidation. The experimental results were compared to the calculations of the DP for the transition from internal to external oxidation based on the Wagner model. The evolution of the surface oxide composition during annealing was analyzed thermodynamically by means of the chemical potential diagram for the surface oxides. In the high DP atmosphere conditions, mainly, Mn-rich xMnO·SiO2 (1 < x < 2) oxides were formed at the surface, while Si-rich xMnO·SiO2 (x < 1) oxides were formed by internal oxidation. The use of a high DP gas atmosphere is therefore advantageous to induce internal selective oxidation and reduce the amount of surface oxides. It also leads to the formation of Mn-rich xMnO·SiO2 (1 < x < 2) oxides.

Keywords

Austenite Internal Oxidation Trip Steel Intercritical Annealing External Oxidation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully acknowledge the support of Dr. Myung Soo Kim and Dr. Young Ha Kim of the POSCO technical Research Laboratories, Gwangyang, South Korea.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Lawrence Cho
    • 1
  • Geun Su Jung
    • 1
  • Bruno C. De Cooman
    • 1
    • 2
  1. 1.Graduate Institute of Ferrous TechnologyPohang University of Science and TechnologyPohangSouth Korea
  2. 2.Materials Design LaboratoryPohang University of Science and TechnologyPohangSouth Korea

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