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

Abstract:

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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

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

258-261

DOI:

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

Citation:

Y. F. Gong et al., "Selective Oxidation and Sub-Surface Phase Transformation during Austenitic Annealing of TWIP Steels", Materials Science Forum, Vols. 654-656, pp. 258-261, 2010

Online since:

June 2010

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$35.00

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