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An experimental investigation on B2 phase transfer and grain boundary character on mechanical properties of rapidly cooled Fe–6.5 wt% Si alloy

Published online by Cambridge University Press:  04 December 2017

Guojun Cai ,
Changsheng Li ,
Ban Cai  and
Qiwen Wang
Guojun Cai
Affiliation:
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning 110819, China
Changsheng Li*
Affiliation:
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning 110819, China
Ban Cai
Affiliation:
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning 110819, China
Qiwen Wang
Affiliation:
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning 110819, China
*
a)Address all correspondence to this author. e-mail: lics@ral.neu.edu.cn
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Abstract

The combined effect of B2 phase transfer and grain boundary character on mechanical properties of the Fe–6.5 wt% Si alloy was investigated. The microstructures and textures of the Fe–6.5 wt% Si alloy under four cooling modes were characterized by X-ray diffraction, transmission electron microscope, and electron backscattered diffraction. The results reveal that the maximum nano-hardness value (8.9 GPa) results from the two-step air-cooling sample, while for the two-step water-cooling sample, the minimum value (5.3 GPa) is achieved. The transformation of the B2 phase affected by the water-cooling process is a critical factor in obtaining the lower APB energy and eliminating the brittlenes. A large fraction of the coincidence site lattice boundaries that formed on the sheet experienced the two-step water-cooling process due to a uniform and sharp γ-fiber recrystallization texture comprising the {111} 〈110〉 and {111} 〈112〉 components, which enhances resistance to intercrystalline effect and improves mechanical properties in comparison with the two-step air-cooling process.

Keywords

Fe–6.5 wt% SiB2CSL boundariesγ-fiberAPB energy
Type
Articles
Information
Journal of Materials Research , Volume 33 , Issue 4 , 28 February 2018 , pp. 507 - 515
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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