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Particle and microstructural characteristics in the coarse-grained heat-affected zone of Al–Ti–Ca complex deoxidized steels

  • Yu Liu , Xiangliang Wan , Guangqiang Li , Yong Wang , Wan Zheng and Yanhui Hou
Published/Copyright: January 30, 2019
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Abstract

The particles and microstructures in the coarse-grained heat-affected zones of Al–Ti–Ca complex deoxidized steels with different Al content were investigated by in-situ observation, various analytical techniques and calculations. The results show that the inclusions in high Al steel consist of Al–Ca oxides containing small amounts of TiOx surrounded by an outer layer of MnS. In low Al steel, the inclusions consist of Al–Ca–Ti oxides with high TiOx content covered by an outer layer of MnS, and the high TiOx content in the inclusions can remarkably enhance the ability of the inclusions to promote acicular ferrite nucleation. The fine-grained microstructure obtained in the coarse-grained heat-affected zones of low Al steel is attributed to the pinning effect of the finer particles and the formation of a high density of acicular ferrite.


*Correspondence address, Professor Guangqiang Li, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, No. 947, Heping Avenue, Qingshan District, Wuhan 430081, P.R. China, Tel.: +862768862665, Fax: +862768862665, E-mail:

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Received: 2018-05-15
Accepted: 2018-08-18
Published Online: 2019-01-30
Published in Print: 2019-02-12

© 2019, Carl Hanser Verlag, München

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