Determination of the hot deformation activation energy and flow stress course of the AISI 4140 steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F19%3A10243686" target="_blank" >RIV/61989100:27360/19:10243686 - 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

Determination of the hot deformation activation energy and flow stress course of the AISI 4140 steel

Popis výsledku v původním jazyce

The paper deals with the possibilities of the determination of the hot deformation activation energy and the flow stress course at hot forming conditions. By means of the Gleeble 3800 plastometer, the set of uniaxial compression tests has been carried out for the AISI 4140 steel. The tests were carried out within the temperature range of 850 - 1 250 oC and the strain rate range of 0.1 - 50 s-1 when the strain reached up to 1.0. From the obtained stress - strain curves the values of peak stress were determined and subsequently used to determine the value of the activation energy at hot forming according to the classical equation of the hyperbolic-sine type. Enumeration of its coefficients allow at the same time to predict the maximum flow-stress values of the investigated steel in dependence on the temperature and strain rate. The value of the activation energy has been used to assembly the mathematical models which allow to describe the flow stress course and the kinetics of the dynamic recrystallization of this steel at hot-forming conditions. By this way obtained results have been compared with the previously examined steel of the grade of AISI 4130.

Název v anglickém jazyce

Determination of the hot deformation activation energy and flow stress course of the AISI 4140 steel

Popis výsledku anglicky

The paper deals with the possibilities of the determination of the hot deformation activation energy and the flow stress course at hot forming conditions. By means of the Gleeble 3800 plastometer, the set of uniaxial compression tests has been carried out for the AISI 4140 steel. The tests were carried out within the temperature range of 850 - 1 250 oC and the strain rate range of 0.1 - 50 s-1 when the strain reached up to 1.0. From the obtained stress - strain curves the values of peak stress were determined and subsequently used to determine the value of the activation energy at hot forming according to the classical equation of the hyperbolic-sine type. Enumeration of its coefficients allow at the same time to predict the maximum flow-stress values of the investigated steel in dependence on the temperature and strain rate. The value of the activation energy has been used to assembly the mathematical models which allow to describe the flow stress course and the kinetics of the dynamic recrystallization of this steel at hot-forming conditions. By this way obtained results have been compared with the previously examined steel of the grade of AISI 4130.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/EF17_049%2F0008399" target="_blank" >EF17_049/0008399: Rozvoj mezisektorové spolupráce RMTVC s aplikační sférou v oblasti výzkumu progresivních a inovací klasických kovových materiálů a technologií s využitím metod modelování</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2019 : conference proceedings : peer reviewed : 28th International Conference on Metallurgy and Materials : May 22nd-24th 2019, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-92-5

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

467-472

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

22. 5. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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