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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

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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.

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ACKNOWLEDGMENTS

This work was supported by the National Natural Science Foundation Project (51174057 and 51274062), the Specialized Research Fund for the Doctoral Program of Higher Education of China (20130042110040), and the Fundamental Research Funds for the Central Universities (N130607002).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning, 110819, China

    Guojun Cai, Changsheng Li, Ban Cai & Qiwen Wang

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  1. Guojun Cai
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  2. Changsheng Li
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Correspondence to Changsheng Li.

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Cai, G., Li, C., Cai, B. et al. An experimental investigation on B2 phase transfer and grain boundary character on mechanical properties of rapidly cooled Fe-6.5 wt% Si alloy. Journal of Materials Research 33, 507–515 (2018). https://doi.org/10.1557/jmr.2017.433

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