Grain Refinement Mechanism of the Ferrite Grains in a Carbon Steel by Warm Equal Channel Angular Pressing

Chin J Mater Res

2011, Vol. 25

Issue (2): 151-157 DOI:

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Grain Refinement Mechanism of the Ferrite Grains in a Carbon Steel by Warm Equal Channel Angular Pressing

FENG Guanghai¹, DU Zhongze¹, WANG Jingtao², ZHAO Xicheng¹

1.School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055
2.Department of materials science and engineering, Nanjing University of Science and Technology, Nanjing 210094

Cite this article:

FENG Guanghai DU Zhongze WANG Jingtao ZHAO Xicheng. Grain Refinement Mechanism of the Ferrite Grains in a Carbon Steel by Warm Equal Channel Angular Pressing. Chin J Mater Res, 2011, 25(2): 151-157.

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Abstract A submicrometer grain 45C steel was fabricated by equal channel angular pressing (ECAP) by C way at 500^oC and was characterized by optical microscope (OM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) technique. The microstructural development and grain refinement of ferrite was investigated. The results show that, at the first pass of ECAP, the original coarse ferrite grains were broke up into the parallel shear bands of elongated dislocation cells and even subgrains with submicrometer size along the shear direction, resulting from bigger shear deformation. Further pressings results in a slight decrease in the size of elongated dislocation cells and subgrains. With ECAP passes increasing, equiaxed ultrafined ferrite grains with high-angle boundaries were achieved by grains sliding and rotation.

Key words: metallic materials steel submicrometer grained microstructure SPD ECAP shear bands

Received: 01 September 2010

ZTFLH:

TG142

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Supported by National Nature Science Foundation of China No.59974018.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2011/V25/I2/151

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