Selective Oxidation and Sub-Surface Phase Transformation during Austenitic Annealing of TWIP Steels

Yong Feng Gong; Han Soo Kim; Sung Kyu Kim; Bruno C. De Cooman

doi:10.4028/www.scientific.net/MSF.654-656.258

Paper Titles

Mechanical Properties of Micro-Alloyed TRIP Steel
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Mechanical Properties of Hypereutectoid Steel with Microduplex (α+θ) Structure Formed by Hot Deformation of Undercooled Austenite
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Hot-Rolled TRIP Steels Based on Dynamic Transformation of Undercooled Austenite
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Effect of Thermomechanical Processing Parameters on the Microstructure Development in Low Si TRIP Steel
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Selective Oxidation and Sub-Surface Phase Transformation during Austenitic Annealing of TWIP Steels
p.258

Effect of N on Microstructure and Tensile Behavior of TWIP Steel
p.262

Hot-Working Behaviour of Advanced High-Manganese C-Mn-Si-Al Steels
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Constitutive Modeling of TWIP Steel in Uni-Axial Tension
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Development of a Robust TRIP800 Concept for GI/GA Automotive Applications
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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Selective Oxidation and Sub-Surface Phase...

Selective Oxidation and Sub-Surface Phase Transformation during Austenitic Annealing of TWIP Steels

Abstract:

The selective oxidation of Al-free and Al-added Twinning Induced Plasticity (TWIP) steels during full austenitic annealing at 800°C in N2+10%H2 atmosphere at a dew point of -17°C was investigated by means of HR-TEM of FIB cross-sectional samples. For Al-free TWIP steel, a dense MnO layer was formed on the surface. Crystalline c-xMnO.SiO2(x2) particles and amorphous a-xMnO.SiO2(x<0.9) particles were found at the MnO layer/steel matrix interface. In the subsurface, Mn depletion resulted in the transformation of the austenite to the ferrite phase in a narrow zone. For Al-added TWIP steel, a continuous outer MnO layer and a transition layer consisting of amorphous a-xMnO.SiO2(x<0.9) and crystalline c-MnO.Al2O3(0.8

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Periodical:

Materials Science Forum (Volumes 654-656)

Pages:

258-261

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.258

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Online since:

June 2010

Authors:

Yong Feng Gong, Han Soo Kim, Sung Kyu Kim, Bruno C. De Cooman

Keywords:

Dew Point, Galvanizing, Galvannealing, Selective Oxidation, Twinning Induced Plasticity (TWIP), Void

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