Influence of the pearlite fineness on the mechanical properties, deformation behavior, and fracture characteristics of carbon steel

Autor: V. A. Pozdnyakov, E. V. Luk’yanenko, G. A. Filippov, O. Yu. Usanova, V. I. Izotov
Rok vydání: 2007
Předmět:
Zdroj: The Physics of Metals and Metallography. 103:519-529
ISSN: 1555-6190
0031-918X
DOI: 10.1134/s0031918x07050122
Popis: Specific features of plastic deformation and tensile failure of a plain carbon (C = 0.62%) pearlitic-ferritic steel with various pearlite fineness have been investigated. It is shown that the steels with coarse lamellar pearlite and fine lamellar pearlite have similar strain-hardening coefficients, but the relative elongation of the former steel is higher. Deformation results in a uniform dislocation distribution in the fine pearlite and in the formation of a cellular substructure in the coarse pearlite. It is established that the fine pearlite undergoes plastic deformation and ductile failure as a single structure, while the coarse pearlite exhibits a structure discontinuity upon deformation. A model of microplastic pearlite deformation and the initial stage of macroplastic pearlite deformation is proposed. It is established that the strain-hardening coefficient of pearlite at the initial deformation stage does not depend on its dispersity. A size effect, which manifests itself in the dependence of the dislocation structure formed in the ferrite interlayers on their thickness, is shown to be characteristic of pearlite deformation.
Databáze: OpenAIRE
Externí odkaz: