The structure and phase composition of welded joint after deformation

Aleksander Smirnov, Natalya Popova, Eugeniy Ozhiganov, Elena Nikonenko, Nikolay Ababkov, Mark Kalashnikov, Nina Koneva, Eduard Kozlov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The paper addresses the issue of the structure and phase composition of welded joint and focuses on their investigation after plastic deformation. The contribution of internal stresses to the formation of phase composition and fine structure of welded joint is shown herein. Electrode welding is used to obtain welded joint in St3 steel. Specimens are subjected to a quasi-static tensile deformation ranging from 0 to 5% under 370 MPa loading. TEM investigations on thin foil specimens allow studying the structure and phase composition within the heat-affected zone at 1 mm distance from base material and 0.5 mm from welding material. The degree of plastic deformation is shown for both base and welding materials and includes their morphology, phase composition, defect structure and its parameters. Long-range stresses are divided into plastic and elastic. Plastic deformation has no qualitative effect on the material structure, however, it modifies its quantitative parameters. With the increase of deformation degree, the perlite component becomes more imperfect and transforms, first, to a fractured perlite and then to ferrite, thereby decreasing the volume ratio of perlite. Polarization of the dislocation structure is observed. The amplitude of internal stress fields grows. Unlike the shear stresses, long-range stresses manifest their intensive growth. The elastic component makes the major contribution to the long-range stresses resulting in the formation of microcracks.

Original languageEnglish
Title of host publicationYouth, Science, Solutions
Subtitle of host publicationIdeas and Prospects, YSSIP 2016: Proceedings of the III International Young Researchers Conference "Youth, Science, Solutions: Ideas and Prospects"
EditorsNatalia O. Kopanitsa
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414686
DOIs
Publication statusPublished - 10 Jan 2017
Event3rd International Young Researchers Conference on Youth, Science, Solutions: Ideas and Prospects, YSSIP 2016 - Tomsk, Russian Federation
Duration: 22 Nov 201625 Nov 2016

Publication series

NameAIP Conference Proceedings
Volume1800
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Young Researchers Conference on Youth, Science, Solutions: Ideas and Prospects, YSSIP 2016
CountryRussian Federation
CityTomsk
Period22.11.1625.11.16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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