Changes in dislocation substructure of S235JR steel during fatigue loading

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F14%3A00430527" target="_blank" >RIV/68378297:_____/14:00430527 - isvavai.cz</a>

Result on the web

<a href="http://www.metal2014.com/files/proceedings/17/reports/2700.pdf" target="_blank" >http://www.metal2014.com/files/proceedings/17/reports/2700.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Changes in dislocation substructure of S235JR steel during fatigue loading

Original language description

Changes in dislocation substructure were studied in normalized and annealed S235JR steel in relation to the number of symmetrical reversed stress cycles with the amplitude σa = 242 MPa and corresponding mean life Nf = 17,950 cycles. The microstructure of the steel consisted of ferrite with a small amount of pearlite. The substructure was observed in as received condition and after application of various relative numbers of cycles n/Nf, these being 0.25, 0.50 and 0.75. An irregular dislocation net occurred in the virgin specimen, however, during cyclic loading the dislocations started to accumulate gradually in slip bands and to form a cell substructure in grains of favourable crystallographic orientations. Total dislocation density, dislocation density in slip bands and inter-band distance were measured using transmission electron microscopy (TEM). The total dislocation density was found to slightly decrease and the density in slip bands to increase with increasing number of cycles. The results concerning the dislocation density were compared with changes in the microplastic limit (MPL) which were determined by the measurement of the inductance of the “specimen - coil” system. They consisted in a rapid initial decrease at the first stage of the fatigue process and in a gradual increase during the major part of the life. These changes can be interpreted on the basis of changes in dislocation density as was verified independently by X-ray diffraction and nanoindentation tests. On the basis of the measurement of dislocation density by TEM it appears that changes in MPL can be connected with the dislocation density in slip bands rather than with the total dislocation density.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2014

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Conference proceedings. 23rd International Conference on Metallurgy and Materials

ISBN

978-80-87294-52-9

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

534-539

Publisher name

TANGER

Place of publication

Ostrava

Event location

Brno

Event date

May 21, 2014

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000350641700085