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Title: Microtwins and their effect on accumulation of excess dislocation density in grains with different types of crystal lattice bending in deformed austenitic steel

The investigation of excess dislocation density accumulation in the deformed polycrystalline austenitic steel was carried out using transmission electron microscopy (TEM). The distributions of the excess dislocation density in the grains of the deformed austenitic steel with different bending types were obtained and plotted. It was established that in the austenitic polycrystalline steel at the deformation degrees ε = 14 and 25 % the distributions of the excess dislocation density are multimodal. In both cases the grain with compound bending is more stressed. The values of the average excess dislocation density in the grains with the compound and simple bending are less at ε = 25 % than that at ε = 14 %. This is explained by a significant relaxation of the internal stresses in steel with the increase of the deformation degree from 14 % to 25 %. The increase of the number of twinning systems and the material volume fraction covered by twinning leads to the internal stress relaxation and consequently to the increase of the excess dislocation density. The presence of microtwins in the deformed material has an influence on the distribution of the excess dislocation density. In the deformed polycrystalline austenitic steel the number ofmore » grains with compound bending is increased with the increase of the plastic deformation degree.« less
Authors:
 [1] ; ; ; ;  [2]
  1. National Research Tomsk Polytechnic University, 30, Lenin Ave., 634050, Tomsk (Russian Federation)
  2. Tomsk State University of Architecture and Building, 2, Solyanaya Sq., 634003, Tomsk (Russian Federation)
Publication Date:
OSTI Identifier:
22494424
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1698; Journal Issue: 1; Conference: AMTC-2015: 2. all-Russian scientific conference of young scientists on advanced materials in technology and construction, Tomsk (Russian Federation), 6-9 Oct 2015; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AUSTENITIC STEELS; BENDING; CRYSTAL LATTICES; DENSITY; DISLOCATIONS; DISTRIBUTION; PLASTICITY; POLYCRYSTALS; RELAXATION; RESIDUAL STRESSES; TRANSMISSION ELECTRON MICROSCOPY; TWINNING