Influence of the equilibrium dislocation substructure on the structure component morphology in the heterogeneous phase transformations in polycrystalline metallic alloys
DOI:
https://doi.org/10.31498/2225-6733.33.2016.104750Keywords:
equilibrium dislocation substructure, elastic strain fields, space distribution of atoms, microstructureAbstract
Theoretical analysis of the dislocation subgrain boundary (DSB) influence on the microstructure formation at the equilibrium heterogeneous polymorphic phase transformations in polycrystalline alloys has been carried out. Based on the dislocation structure of the DSB and its tendency of reaching equilibrium, evolution of the internal state for the various types of DSB (twisting and tilting) and corresponding elastic strain fields has been considered. Redistribution is shown to develop during the transformation of the crystal elastic energy from the twist to the tilt DSB formed, respectively, by screw and edge dislocations. Localization of the elastic energy on the tilt DSB in the equilibrium crystal state is shown due to the dislocation reactions development between screw dislocations within the corresponding mutually crossing arrays. Taking into account the crystalline lattice elastic distortions around solute atoms and interaction of the atoms with grain boundaries (GB), the analogous chemical element space distributions are shown to appear on DSB and GB. Forming of structure components of specific morphology resulting from the distributions is shown. The possibility to form homogeneous space distributions of atoms as well as dispersed structural constituents under optimal thermal treatment has been stated. Metallographic investigations were conducted using alloy steels of various chemical compositions. Main conclusions of the theoretical analysis have been confirmed by the experimental resultsReferences
Перелік використаних джерел (ГОСТ):
Christian J.W. The theory of transformations in metals and alloys. Part 1. / J.W. Christian. – London, Pergamon Press, 1975. – 786 p.
Subgrain formation during deformation: physical origin and consequences / R. Sedlasek, W. Blum, J. Kratochvil, S. Forest // Metallurgical and Materials Transactions A. – 2001. – Vol. 32A, no. 1. – Р. 21-30.
Scientific work. Some features of the heterogeneous diffusive nucleation and their use to form new type microstructures and eliminate chemical nonuniformities in bulk industrial product made of alloy structural steels / І.F.Тkachenko, К.І. Тkachenko, V.І. Мiroshnichenko. – Свідоцтво № 68323 від 25.10.2016.
Ткаченко І.Ф. Розвиток наукових і методологічних основ прогнозування і оптимізації складів і технологій термічного зміцнення комплексно-легованих сталей : автореф. дис. …д-ра техн. наук : 05.16.01 / І.Ф. Ткаченко; Призов. держ. техн. ун-т. – Маріуполь, 2007. – 40 с.
Martin J. Micromechanisms in particle hardened alloys / J. Martin. – Cambrige, Cambrige Univ. Press, 1980. – 167 p.
References:
Christian J.W. The theory of transformations in metals and alloys. Part 1. London, Pergamon Press Publ., 1975. 786 p.
Sedlasek R., Blum W., Kratochvil J., Forest S. Subgrain formation during deformation: physical origin and consequences. Metallurgical and Materials Transactions A, 2001, vol. 32A, no. 1, pp. 21-30.
Tkachenko I.F., Тkachenko К.І., Мiroshnichenko V.І. Scientific work «Some features of the heterogeneous diffusive nucleation and their use to form new type microstructures and eliminate chemical nonuniformities in bulk industrial product made of alloy structural steels». Certificate about registration no. 68903, 2016. (Ukr.)
Tkachenko I.F. Rozvitok naukovikh і metodologіchnikh osnov prognozuvannia і optimіzatsії skladіv і tekhnologіi termіchnogo zmіtsnennia kompleksno-legovanikh stalei. Avtoref. diss. dokt. techn. nauk [Development of scientific and methodological bases of forecasting and optimization for compositions and heat treatment technologies of multi-component alloy steels. Thesis of doct. tech. sci. diss.]. Mariupol, 2007. 40 p.
Martin J. Micromechanisms in particle hardened alloys. Cambrige, Cambrige Univ. Press Publ., 1980. 167 p.
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