Dislocation Structure Evolution during Plastic Deformation of Low-Carbon Steel

Abstract:

The paper analyzes the regularities of structure formation in low-alloyed carbon steels. During the investigation of ferritic-pearlitic steel samples it has been found that the structure formation in pearlite essentially lags behind structural changes in ferrite grains, and this delay is observed at all stages of deformation. An important feature of structure formation in pearlite is crack nucleation in cementite, accompanied by dislocation pile-up in the ferrite interlayers of pearlite. Using the method of dislocation dynamics, the relationship between structural transformations and the parameters of strain hardening is analyzed. It is demonstrated that the proposed method of computer analysis reflects well the processes taking place in a material during plastic deformation. The character of the theoretical curve of strain hardening is determined by the dislocation structure that forms in a material at various stages of deformation.

• Periodical: Materials Science Forum (Volume 870)
• Pages: 253-258
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.870.253
• Online since: September 2016
• Authors: Georgy I. Raab, Yu.M. Podrezov, Gennady N. Aleshin*
• Keywords: Cementite, Evolution of Dislocation Structure, Ferritic, Low-Alloyed Carbon Steels, Method of Dislocation Dynamics, Pearlitic, Strain Degree, Strain Hardening

References

[1] S.A. Firstov, T.G. Rogul, O.A. Shut, Strengthening of polycrystals during a transition from the micro- to the nanostructured state, Physico-Chemical Mechanics of Materials. 6 (2009) 5-12. (in Russian).

[2] R.Z. Valiev, A.P. Zhilyaev, T.G. Langdon, Bulk Nanostructured Materials: Fundamentals and Applications, Wiley STM, USA (2014).

[3] R.Z. Valiev, О.А. Каibyshev, R.I. Кuznetsov, R Sh. Мusalimov, N.К. Tsenev, Of reports of Acad. Sciences of the USSR. 4 (1988) 864-866. (in Russian).

[4] F.Z. Utyashev, G.I. Raab, Deformation Methods of Fabrication and Processing of Ultrafine-Grained and Nanostructured Materials, Gilem, Ufa, 2013. (in Russian).

[5] V.I. Trefilov, V.F. Moiseev, E.P. Pechkovskiy, Strain Hardening and Fracture of Polycrystalline Materials, Naukova dumka, Kiev, 1987. (in Russian).

[6] Ya. Yu. Beigelzimer, V.N. Varyukhin, D.V. Orlov, S.G. Synkov, Twist Extrusion – Strain Deformation Process, TEAN, Donetsk, 2003. (in Russian).

[7] S.A. Firstov, Yu.N. Podrezov, V.I. Kopylov, M.I. Danylenko, Structural sensitivity of the mechanical properties of Armco iron subjected to equal-channel angular pressing, Metally. 1 (2004) 96-103. (in Russian).

[8] Yu.N. Podrezov, S.A. Firstov, Two approaches to analysis of strain hardening curves, High Pressure Physics and Technics. 4 (2006) 37-48. (in Russian).

[9] S.B. Goryachev, Microscopic Mechanisms of Strain Hardening, MEPhI, Moscow, 1984. (in Russian).

[10] A.M. Rosenberg, O.A. Rosenberg, M.S. Pasechnik, New Comprehensive Method for Testing Process Lubricants for Metal Forming, Kiev, 1971. (in Russian).

[11] V.V. Rybin, Large Plastic Strains and Fracture of Metals, Metallurgy, Moscow, 1986. (in Russian).

[12] М.І. Danylenko, Yu.M. Podrezov, S.A. Firstov, The influence of strain degree on the structural transformations and mechanical properties of the low-carbon steel 20Kh, in: Inter-University Collection: Naukovy Notatki, Lutsk, 2015, pp.42-46.

[13] G.V. Sarafanov, V.N. Perevezentsev, The effect of screening of disclination elastic field by the system of dislocations, Technical Physics Letters. 11 (2005) 936-938.

DOI: 10.1134/1.2136958

[14] V.N. Perevezentsev, G.F. Sarafanov, J.V. Svirina, Computer simulation of the dislocation ensemble kinetics in the elastic fields of mesodefects and fragmentation processes during plastic deformation, Materials Physics and Mechanics. 21 (2014).

[15] N.I. Danylenko, V.V. Kovylyaev, S.S. Ponomaryov, S.A. Firstov, in: Naukovy Notatki, part II, Lutsk, 2009, pp.69-72. (in Russian).

[16] T. Ekobori, Scientific Fundamentals of Strength and Fracture of Materials, Metallurgy, Moscow, 1971. (in Russian).

[17] J. Segurado, J. Lorca, I. Romero, Computational issues in the simulation of two-dimensional discrete dislocation mechanics, Modelling and Simulation in Materials Science and Engineering. 15 (2007) S361-S375.

DOI: 10.1088/0965-0393/15/4/s04

[18] E.M. Borysovska, Yu.N. Podrezov, Analysis of the dislocation annihilation process in the case of their chaotic disposition, in: the Collection Mathematical Models and a Computational Experimenting Materials Science, Kiev, 2006, p.116.

[19] E.M. Borysovska, Yu.N. Podrezov, S.A. Firstov, Dynamics of structural transformations taking into account dislocation nucleation, Electronic Microscopy and Strength of Materials. 14 (2007) 3-11. (in Russian).

[20] V.V. Rybin, Principles of microstructure formation in the process of plastic loading, Problems of Materials Science. 29 (2002) 11-33. (in Russian).

[21] V.V. Rybin, Regularities in the formation of meso-structures in the course of a developed plastic deformation, Issues of Materials Science. 29 (2002) 34-49. (in Russian).

[22] A.N. Orlov, V.N. Perevezentsev, V.V. Rybin, Grain Boundaries in Metals, Metallurgy, Moscow, 1980. (in Russian).