Original scientific paper

Ultrafine-grained low carbon steels by severe plastic deformation

S. Dobatkin ; Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
J. Zrnik ; Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
Ilija Mamuzić ; Faculty of Metallurgy, University of Zagreb, Sisak, Croatia

Abstract

The structure and properties of 0,14% C and 0,1% C - B low-carbon steels taken in two initial states, martensitic and ferritic-pearlitic, were studied after cold equal-channel angular (ECA) pressing. ECA pressing leads to the formation of only partially submicrocrystalline structure with a grain size of 150 – 300 nm, depending on the steel alloying and initial state. The finest structure with the elements of 190 nm in size is obtained in the 0,1% C - B steel microalloyed with boron. The strength of the 0,1% C - B steel after cold ECA pressing (Rm = 805-1235 MPa) meets the specifications of fasteners of the R80 - R120 strength grade. The strength of the deformed 0,14% C steel is close to the R80 strength grade.

Keywords

low carbon steel; severe plastic deformation (SPD); equal channel angular pressing; submicrocrystalline structure; strength

Hrčak ID:

22657

URI

https://hrcak.srce.hr/22657

Publication date:

1.7.2008.

Article data in other languages: croatian

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