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Microstructure and Wear Properties of High-Pressure Torsion Processed Iron

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Abstract:

Microstructure and sliding wear properties of the sub-microcrystalline pure iron produced by an HPT process were investigated in detail. It was found the grains of pure iron were significantly refined to the submicron size range by an HPT process, and the Vickers hardness of HPT-processed specimens increased with increasing number of turns and distance from the center due to the grain refinement. A linear relationship between the hardness and the inverse square root of grain size (the Hall-Petch relationship) was realized. The HPT process clearly increased the wear resistance, and a linear correlation between the specific wear rate and the inverse of the Vickers hardness was found, which agreed with the Archard wear equation. The wear in SUJ2 ball wear tests was much higher than that in WC-Co ball wear tests owing to the high adhesion between the specimen materials.

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Material Science and Engineering Technology V View Preview

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Periodical:

Materials Science Forum (Volume 890)

Pages:

371-374

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.890.371

Citation:

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Online since:

March 2017

Authors:

Hirotaka Kato*, Yoshikazu Todaka

Keywords:

Hardness, High-Pressure Torsion Straining, Pure Iron, Sub-Microcrystalline, Wear

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* - Corresponding Author

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