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Statements

Subject Item
n2:RIV%2F47718684%3A_____%2F14%3A%230000593%21RIV15-TA0-47718684
rdf:type
n16:Vysledek skos:Concept
dcterms: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. 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.
dcterms:title
CHANGES IN DISLOCATION SUBSTRUCTURE OF S235JR STEEL DURING FATIGUE LOADING CHANGES IN DISLOCATION SUBSTRUCTURE OF S235JR STEEL DURING FATIGUE LOADING
skos:prefLabel
CHANGES IN DISLOCATION SUBSTRUCTURE OF S235JR STEEL DURING FATIGUE LOADING CHANGES IN DISLOCATION SUBSTRUCTURE OF S235JR STEEL DURING FATIGUE LOADING
skos:notation
RIV/47718684:_____/14:#0000593!RIV15-TA0-47718684
n5:aktivita
n13:P
n5:aktivity
P(TE01020118)
n5:dodaniDat
n11:2015
n5:domaciTvurceVysledku
n17:8297398
n5:druhVysledku
n18:D
n5:duvernostUdaju
n9:S
n5:entitaPredkladatele
n20:predkladatel
n5:idSjednocenehoVysledku
6798
n5:idVysledku
RIV/47718684:_____/14:#0000593
n5:jazykVysledku
n14:eng
n5:klicovaSlova
Carbon steel, cyclic loading, transmission electron microscopy, dislocation, inductance
n5:klicoveSlovo
n7:inductance n7:transmission%20electron%20microscopy n7:cyclic%20loading n7:Carbon%20steel n7:dislocation
n5:kontrolniKodProRIV
[22E1EDB02986]
n5:mistoKonaniAkce
Brno, ČR
n5:mistoVydani
Brno, ČR
n5:nazevZdroje
METAL 2014
n5:obor
n6:JG
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
3
n5:projekt
n12:TE01020118
n5:rokUplatneniVysledku
n11:2014
n5:tvurceVysledku
Jandová, Dagmar
n5:typAkce
n15:WRD
n5:zahajeniAkce
2014-01-01+01:00
s:numberOfPages
6
n10:hasPublisher
Tanger s.r.o.
n3:isbn
978-80-87294-54-3