pp. 1563-1576 | Article Number: iejme.2016.140
Published Online: August 26, 2016
Article Views: 229 | Article Download: 231
In this paper, the regularities of structure formation in low-alloyed carbon steels are analyzed. They coincide to a large extent with the general views on the effect of strain degree on the evolution of deformation structure. In ferrite grains, not only the qualitative picture of changes, well known for Armco iron, is repeated, but also the quantitative values of strain corresponding to a change in the structural state are repeated as well. When investigating samples of a ferritic-pearlitic steel, it is found that 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.
Keywords: Low-alloyed carbon steels; strain degree; evolution of dislocation structure; strain hardening; method of dislocation dynamics
Beigelzimer, Ya.Yu., Varyukhin, V.N., Orlov, D.V., & Synkov, S.G. (2003). Twist Extrusion. Strain Deformation Process. Donetsk: TEAN, 87 p.
Borysovska, E.M., & Podrezov, Yu.N. (2006). Analysis of the Dislocation Annihilation Process in the Case of their Chaotic Disposition. Kiev: Collection «Mathematical Models and a Computational Experimenting Materials Science», 8, 116 p.
Borysovska, E.M., Podrezov, Yu.N., & Firstov, S.A. (2007). Dynamics of Structural Transformations Taking into Account Dislocation Nucleation. Electronic Microscopy and Strength of Materials, 14, 3–11.
Danylenko, N.I., Kovylyaev, V.V., Ponomaryov, S.S., & Firstov, S.A. (2009). Lutsk: Inter-University Collection "NAUKOVY NOTATKI",69-72.
Danylenko, М.І., Podrezov, Yu.M., & Firstov, S.A. (2015). The Influence of Strain Degree on the Structural Transformations and Mechanical Properties of the Low-Carbon Steel 20Kh. Lutsk: Inter-University Collection "NAUKOVY NOTATKI", 49, 42-46.
Ekobori. T. (1971). Scientific Fundamentals of Strength and Fracture of Materials. Moscow: Metallurgy, 264 p.
Firstov, S.A., Podrezov, Yu.N., Kopylov, V.I., Danylenko, M.I. (2004). Structural Sensitivity of the Mechanical Properties of Armco Iron Subjected to Equal-Channel Angular Pressing. Metally, 1, 96-103.
Firstov, S.A., Rogul, T.G., & Shut, O.A. (2009). Strengthening of Polycrystals During a Transition from the Micro- to the Nanostructured State. Physicochemical Mechanics of Materials, 6, 5-12.
Goryachev, S.B. (1984). Microscopic Mechanisms of Strain Hardening. Moscow: MEPhI, 61 p.
Orlov, A.N., Perevezentsev, V.N., & Rybin, V.V. (1980). Grain Boundaries in Metals. Moscow: Metallurgy, 156p.
Perevezentsev, V.N., Sarafanov, G.F., & Svirina, J.V. (2014). Computer Simulation of the Dislocation Ensemble Kinetics in the Elastic Fields of Mesodefects and Fragmentation Processes During Plastic Deformation. Materials Physics and Mechanics, 21, 78-98.
Podrezov, Yu.N., & Firstov, S.A. (2006). Two Approaches to Analysis of Strain Hardening Curves. High Pressure Physics and Technics, 16(4), 37—48.
Rosenberg, A.M., Rosenberg, O.A., Pasechnik, M.S. et al. (1971). New Comprehensive Method for Testing Process Lubricants for Metal Forming, 32 – 37. Kiev: APOSTROF.
Rybin, V.V. (1986). Large Plastic Strains and Fracture of Metals. Moscow: Metallurgy, 224 p.
Rybin, V.V. (2002). Principles of Microstructure Formation in the Process of Plastic Loading. Problems of Materials Science, 1(29), 11- 33.
Rybin, V.V. (2002). Regularities in the Formation of Meso-Structures in the Course of a Developed Plastic Deformation. Issues of Materials Science, 1(29), 34-49.
Sahin, E. A. & Deniz, H. (2016). Exploring Elementary Teachers’ Perceptions about the Developmental Appropriateness and Importance of Nature of Science Aspects. International Journal of Environmental and Science Education, 11 (9), 2673-2698
Sarafanov, G.V., & Perevezentsev, V.N. (2005). The Effect of Screening of Disclination Elastic Field by the System of Dislocations. Technical Physics Letters, 31(11), 936 – 938.
Segurado, J., Lorca, J., & Romero, I. (2007). Computational Issues in the Simulation of Two-Dimensional Discrete Dislocation Mechanics. Modelling and Simulation in Materials Science and Engineering, 15, S361-S375.
Trefilov, V.I., Moiseev, V.F., Pechkovskiy, E.P. et al. (1987). Strain Hardening and Fracture of Polycrystalline Materials. Kiev: Naukova dumka, 245 p.
Utyashev, F.Z., & Raab, G.I. (2013). Deformation Methods of Fabrication and Processing of Ultrafine-Grained and Nanostructured Materials. Ufa: Gilem, 376 p.
Valiev, R.Z., Zhilyaev, A. P. & Langdon, T. G. (2014). Bulk Nanostructured Materials: Fundamentals and Applications. USA: Wiley STM, 440 p.
Valiev, R.Z., Каibyshev, О.А., Кuznetsov, R.I., Мusalimov, R.Sh., & Tsenev, N.К. (1988). USSR: Doklady Akademii Nauk, 301(4), 864-866.