Isothermal Transformation of Wustite for Low Carbon Micro-Alloyed Steel

Sheng Liu; Di Tang; Hui Bin Wu; Zheng Xu Cai

doi:10.4028/www.scientific.net/AMR.683.457

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 683Isothermal Transformation of Wustite for Low...

Isothermal Transformation of Wustite for Low Carbon Micro-Alloyed Steel

Abstract:

The isothermal transformation of wustite (FeO) in the range of 650~350°C was studied using Gleeble 3500 thermal simulated test machine, electron back-scatter diffraction (EBSD) and scanning electron microscopy (SEM). A wustite layer was initially formed by oxidizing low carbon micro-alloyed steel in air at 880°C for 20 seconds. The layer was then isothermally annealed at 650-350°C in argon for up to 10000 seconds. The transformation of FeO was comprised by a proeutectoid reaction and a eutectoid reaction. FeO initially transformed to Fe3O4 by proeutecioid reaction and then the retained FeO transformed to lamellar mixture Fe+Fe3O4 by eutectoid reaction. The proeutectoid and eutectoid reactions both followed a C-curve trend and the nose temperatures were 475°C and 425°C, respectively. An isothermal transformation (IT) diagram was summarized based on our results.

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Periodical:

Advanced Materials Research (Volume 683)

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457-463

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.683.457

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Online since:

April 2013

Authors:

Sheng Liu, Di Tang, Hui Bin Wu, Zheng Xu Cai

Keywords:

FeO, Isothermal Transformation, Nose Temperature

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