Hardening of 100CrMnSi6-4 bearing steel after accelerated carbide spheroidisation and long-duration annealing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F15%3AN0000005" target="_blank" >RIV/26316919:_____/15:N0000005 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Hardening of 100CrMnSi6-4 bearing steel after accelerated carbide spheroidisation and long-duration annealing

Popis výsledku v původním jazyce

Spheroidising is an important and time-demanding stage of the treatment of bearing steels. Research into the so-called accelerated carbide spheroidisation showed that it was possible to spheroidise lamellar pearlite by thermomechanical or thermal treatment within several minutes. Globular carbide particles and the grain size of the matrix after accelerated carbide spheroidisation are significantly smaller than after the conventional long-duration soft annealing. The martensitic structure after hardening is therefore finer as well. This proves that the microstructure and properties of the final hardened product depend on prior annealing. Finer carbides in the structure enhance hardness and dissolve more readily during austenitisation. Consequently, lower quenching temperature can be used and the energy required for the quenching process is reduced. The risk of residual stresses and distortion can be mitigated as well. The present experiment was devoted to accelerated carbide spheroidisation and subsequent hardening. The microstructure and properties after the accelerated treatment were compared with those after conventional long-duration treatment.

Název v anglickém jazyce

Hardening of 100CrMnSi6-4 bearing steel after accelerated carbide spheroidisation and long-duration annealing

Popis výsledku anglicky

Spheroidising is an important and time-demanding stage of the treatment of bearing steels. Research into the so-called accelerated carbide spheroidisation showed that it was possible to spheroidise lamellar pearlite by thermomechanical or thermal treatment within several minutes. Globular carbide particles and the grain size of the matrix after accelerated carbide spheroidisation are significantly smaller than after the conventional long-duration soft annealing. The martensitic structure after hardening is therefore finer as well. This proves that the microstructure and properties of the final hardened product depend on prior annealing. Finer carbides in the structure enhance hardness and dissolve more readily during austenitisation. Consequently, lower quenching temperature can be used and the energy required for the quenching process is reduced. The risk of residual stresses and distortion can be mitigated as well. The present experiment was devoted to accelerated carbide spheroidisation and subsequent hardening. The microstructure and properties after the accelerated treatment were compared with those after conventional long-duration treatment.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/LO1412" target="_blank" >LO1412: Rozvoj Západočeského materiálově metalurgického Centra</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název statě ve sborníku

European Conference on Heat Treatment 2015, 22nd IFHTSE Congress

ISBN

978-88-98990-03-0

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

nestránkováno

Název nakladatele

Associazione Italiana di Metallurgia

Místo vydání

Milano (Italy)

Místo konání akce

Venice, Italy

Datum konání akce

20. 5. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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