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The Influence of Oxide Inclusion on the Refinement of Bainite and Toughness in HAZ for Low Carbon Steels

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Abstract:

The influence of Ti oxide on the toughness of heat affected zone for low carbon bainitic steels has been investigated. The optical microscope, SEM and TEM were used to analyze the composition, size and distribution of the inclusions, and the microstructure and mechanical properties after welding thermal simulation were also investigated. The effect of Ti oxide inclusion on the transformation of acicular ferrite has also been studied. The results show that after the melting with Ti dioxide technique the inclusion is complex, in the core is Ti oxides about 1-3 micron and around it is MnS. It has been found the acicular ferrite can nucleate at the inclusions and the Ti oxide inclusion will promote the nucleation of acicular ferrite, and the acicular ferrite will block the growth of bainite. Therefore by introducing the Ti oxide in the steels the microstructure of HAZ could be refined markedly therefore the toughness of HAZ can be improved evidently.

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Periodical:

Advanced Materials Research (Volume 651)

Pages:

163-167

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.651.163

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Online since:

January 2013

Authors:

Shu Rui Li, Xue Min Wang, Xin Lai He

Keywords:

Bainite Refinement, Heat Affected Zone (HAZ), Low Alloy Steel Intragranular Acicular Ferrite, Oxide Inclusion

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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