Journal
STEEL RESEARCH INTERNATIONAL
Volume 82, Issue 11, Pages 1310-1318Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.201100122
Keywords
Continuous Annealing; Selective Oxidation; Twinning Induced Plasticity Steel
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Funding
- WCU (World Class University) through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R32-10147]
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The selective oxidation of Twinning Induced Plasticity (TWIP) steel during annealing at 800 degrees C in a N-2+10%H-2 gas atmosphere with a dew point of -17 degrees C and -3 degrees C was investigated by means of high resolution transmission electron microscopy of cross-sectional samples. The annealing resulted in the selective oxidation of Mn and Si and the austenite-to-ferrite phase transformation of the sub-surface region. In the low dew point atmosphere, the annealing resulted in the formation of a MnO layer at the surface. Crystalline c-xMnO center dot SiO2 (x >= 2) particles and amorphous a-xMnO center dot SiO2 (x<0.9) particles were found at the interface between the MnO layer and the steel matrix. In a narrow zone of the sub-surface, the Mn depletion resulted in the transformation of the initial austenite. In the high dew point atmosphere, a thicker MnO layer was formed on the surface and no mixed manganese-silicon oxides particles were observed at the MnO/steel matrix interface. In the sub-surface, Mn was significantly depleted in the range of 2-3 mu m below the surface and the initial austenite in this zone was transformed to ferrite. MnO particles were found at the grain boundaries and in the interior of grains.
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