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Statements

Subject Item
n2:RIV%2F49777513%3A23210%2F12%3A43917113%21RIV14-GA0-23210___
rdf:type
n12:Vysledek skos:Concept
dcterms:description
Cold and warm formability of pearlite-ferrite steels can be improved by conventional soft annealing. This processing changes the lamellar morphology of pearlite to a globular one. The advantage of this microstructure is a significant reduction of potential defects which would be initiated at the sharp edges of the carbides as a result of localized stress concentration. Annealed structures possess low yield strength and excellent ductility. This ensures their good cold formability. The problems of these technologies lie not only in long processing times, but also in high energy consumption which makes the final product quite expensive. The time necessary for cementite spheroidization can be shortened by unconventional heat treatment around Ac1 temperature combined with deformation applied at various processing stages. This processing method was utilized for spring steel 54SiCr with ferrite-pearlite original microstructure and lamellar pearlite morphology. The hardness of this structure reached 290 HV10. Once Ac1 and Ac3 temperatures of phase transformations were established, different processing parameters were tested. First of all, the most suitable heating temperature was determined. Subsequently, the influence of the character and intensity of deformation on cementite spheroidization and ferrite grain refinement were investigated. Metallographic analysis was carried out by the means of light and scanning electron microscopy and mechanical properties were determined by hardness measurement. Cold and warm formability of pearlite-ferrite steels can be improved by conventional soft annealing. This processing changes the lamellar morphology of pearlite to a globular one. The advantage of this microstructure is a significant reduction of potential defects which would be initiated at the sharp edges of the carbides as a result of localized stress concentration. Annealed structures possess low yield strength and excellent ductility. This ensures their good cold formability. The problems of these technologies lie not only in long processing times, but also in high energy consumption which makes the final product quite expensive. The time necessary for cementite spheroidization can be shortened by unconventional heat treatment around Ac1 temperature combined with deformation applied at various processing stages. This processing method was utilized for spring steel 54SiCr with ferrite-pearlite original microstructure and lamellar pearlite morphology. The hardness of this structure reached 290 HV10. Once Ac1 and Ac3 temperatures of phase transformations were established, different processing parameters were tested. First of all, the most suitable heating temperature was determined. Subsequently, the influence of the character and intensity of deformation on cementite spheroidization and ferrite grain refinement were investigated. Metallographic analysis was carried out by the means of light and scanning electron microscopy and mechanical properties were determined by hardness measurement.
dcterms:title
Enhancement of-carbide spheroidization in Spring Steel by Low-Temperature Thermo-Mechanical Processing Enhancement of-carbide spheroidization in Spring Steel by Low-Temperature Thermo-Mechanical Processing
skos:prefLabel
Enhancement of-carbide spheroidization in Spring Steel by Low-Temperature Thermo-Mechanical Processing Enhancement of-carbide spheroidization in Spring Steel by Low-Temperature Thermo-Mechanical Processing
skos:notation
RIV/49777513:23210/12:43917113!RIV14-GA0-23210___
n12:predkladatel
n17:orjk%3A23210
n4:aktivita
n19:P
n4:aktivity
P(GAP107/10/2272)
n4:dodaniDat
n15:2014
n4:domaciTvurceVysledku
n5:5090237 n5:6179444 n5:1247743 n5:2610078 n5:7666551
n4:druhVysledku
n22:D
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
134443
n4:idVysledku
RIV/49777513:23210/12:43917113
n4:jazykVysledku
n21:eng
n4:klicovaSlova
low-temperature thermo-mechanical processing; spring steel; carbide spheroidization
n4:klicoveSlovo
n10:spring%20steel n10:carbide%20spheroidization n10:low-temperature%20thermo-mechanical%20processing
n4:kontrolniKodProRIV
[1E6740E338D3]
n4:mistoKonaniAkce
Plzeň
n4:mistoVydani
Ostrava
n4:nazevZdroje
COMAT 2012 : recent trends in structural materials
n4:obor
n6:JG
n4:pocetDomacichTvurcuVysledku
5
n4:pocetTvurcuVysledku
5
n4:projekt
n8:GAP107%2F10%2F2272
n4:rokUplatneniVysledku
n15:2012
n4:tvurceVysledku
Jirková, Hana Štádler, Ctibor Mašek, Bohuslav Pileček, Vít Kučerová, Ludmila
n4:typAkce
n20:WRD
n4:zahajeniAkce
2012-11-21+01:00
s:numberOfPages
6
n16:hasPublisher
TANGER
n11:isbn
978-80-87294-38-3
n9:organizacniJednotka
23210