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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 535-537Study of the Ti-Mn-Al-Si-O-S Complex Inclusions...

Study of the Ti-Mn-Al-Si-O-S Complex Inclusions Inducing Intragranular Acicular Ferrite

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Abstract:

High temperature confocal laser microscope, FE-SEM-EDS and EPMA were utilized to study the Ti-Mn-Al-Si-O-S complex inclusion inducing IAF in Ti deoxidized steel. FactStage was also used to calculate the thermodynamics of inclusion formation. It was demonstrated that when the cooling rate is fixed to 5°C/s, IAF can be induced by complex inclusions which act as the core of IAF at 609°C. Microstructure of the complex inclusions is complicated. These inclusions are consisted of the TiOx-MnO core which is surrounded by MnO-Al2O3-SiO2 complex inclusions and small amount of MnS. The reason that Ti-Mn-Al-Si-O-S complex inclusions can induce IAF is that a Mn-depleted zone is formed by the core TiOx-MnO and the MnS around it. Meanwhile, the difference between MnO-Al2O3-SiO2 and austenite thermal expansion coefficients is tremendous is another principle element for the IAF formation.

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Advanced Engineering Materials II

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Periodical:

Advanced Materials Research (Volumes 535-537)

Pages:

620-627

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.535-537.620

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Online since:

June 2012

Authors:

Chengwei Yang, Min Jiang, Xinhua Wang, Tie Ou

Keywords:

IAF, Inclusion, Oxide Metallurgy

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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