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Development of a High-Strength Ultrafine-Grained Ferritic Steel Nanocomposite

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Abstract

This article describes the microstructural and mechanical properties of 12YWT oxide-dispersion-strengthened (ODS)-ferritic steel nanocomposite. According to the annealing results obtained from X-ray diffraction line profile analysis on mechanically alloyed powders milled for 80 hours, the hot extrusion at 1123 K (850 °C) resulted in a nearly equiaxed ultrafine structure with an ultimate tensile strength of 1470 MPa, yield strength of 1390 MPa, and total elongation of 13 pct at room temperature comparable with high-strength 14YWT ODS steel. Maximum total elongation was found at 973 K (600 °C) where fractography of the tensile specimen showed a fully ductile dimple feature compared with the splitting cracks and very fine dimpled structure observed at room temperature. The presence of very small particles on the wall of dimples at 1073 K (800 °C) with nearly chemical composition of the matrix alloy was attributed to the activation of the boundaries decohesion mechanism as a result of diffusion of solute atoms. The results of Charpy impact test also indicated significant improvement of transition temperature with respect to predecessor 12YWT because of the decreased grain size and more homogeneity of grain size distribution. Hence, this alloy represented a good compromise between the strength and Charpy impact properties.

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Acknowledgment

This work was supported by the school of materials research of NSTRC.

Author information

Authors and Affiliations

  1. School of Emerging Sciences and Technologies, Iran University of Science and Technology, Tehran, Iran

    Roohollah Rahmanifard (Assistant Professor)

  2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

    Hasan Farhangi (Associate Professor)

  3. Physics Group, Science Department, Takestan Branch, Islamic Azad University, Takestan, Iran

    Abdul Javad Novinrooz (Associate Professor)

  4. Department of Physics, Karaj Branch, Islamic Azad University, Karaj, Iran

    Samira Moniri (Researcher)

Authors
  1. Roohollah Rahmanifard
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  2. Hasan Farhangi
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  3. Abdul Javad Novinrooz
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  4. Samira Moniri
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Corresponding author

Correspondence to Roohollah Rahmanifard.

Additional information

Manuscript submitted February 25, 2012.

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Rahmanifard, R., Farhangi, H., Novinrooz, A.J. et al. Development of a High-Strength Ultrafine-Grained Ferritic Steel Nanocomposite. Metall Mater Trans A 44, 990–998 (2013). https://doi.org/10.1007/s11661-012-1429-5

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