Metalurgija, Vol. 47 No. 3, 2008.
Izvorni znanstveni članak
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
Sažetak
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.
Ključne riječi
low carbon steel; severe plastic deformation (SPD); equal channel angular pressing; submicrocrystalline structure; strength
Hrčak ID:
22657
URI
Datum izdavanja:
1.7.2008.
Posjeta: 1.291 *