Energy Dissipation and Instability Parameter at High Temperature Forming of Middle Carbon Steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F17%3A10238596" target="_blank" >RIV/61989100:27360/17:10238596 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Energy Dissipation and Instability Parameter at High Temperature Forming of Middle Carbon Steel

Popis výsledku v původním jazyce

Deformation characteristics of carbon steel are studied in the temperature range 900-1200 °C and strain rates 0.1-100 s1 on the plastometr Gleeble using compression tests on cylindrical samples. Processed a single dissipation maps in the field of forming are developed on the basis of changes in the effectiveness of dissipation, depending on temperature and deformation resistance, taking into account the strain rate. Strass-strain curves under different deformation conditions were used. Map of absorption of energy reveals that peak efficiency of strain rate sensitivity parameter is achieved of m values of 0.21 and from that the energy dissipation efficiency η is calculated with purpose to find the optimal forming conditions. At the same time to the contour dissipation map, the map of an instability criterion ξ has been added. The instability forming mode is recorded lower values of ξ, in the present case, however, it is not a dramatic slump, only a warning on the possibility of defects. Behavior analysis indicated that there were a dynamic recrystallization at higher temperatures and in all conditions forming since the value 0.2 deformation (deformation at lower strain rates there) and always above 0.2 to 0.4 even at high strain rates.

Název v anglickém jazyce

Energy Dissipation and Instability Parameter at High Temperature Forming of Middle Carbon Steel

Popis výsledku anglicky

Deformation characteristics of carbon steel are studied in the temperature range 900-1200 °C and strain rates 0.1-100 s1 on the plastometr Gleeble using compression tests on cylindrical samples. Processed a single dissipation maps in the field of forming are developed on the basis of changes in the effectiveness of dissipation, depending on temperature and deformation resistance, taking into account the strain rate. Strass-strain curves under different deformation conditions were used. Map of absorption of energy reveals that peak efficiency of strain rate sensitivity parameter is achieved of m values of 0.21 and from that the energy dissipation efficiency η is calculated with purpose to find the optimal forming conditions. At the same time to the contour dissipation map, the map of an instability criterion ξ has been added. The instability forming mode is recorded lower values of ξ, in the present case, however, it is not a dramatic slump, only a warning on the possibility of defects. Behavior analysis indicated that there were a dynamic recrystallization at higher temperatures and in all conditions forming since the value 0.2 deformation (deformation at lower strain rates there) and always above 0.2 to 0.4 even at high strain rates.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2017: conference proceedings : 26th International Conference on Metallurgy and Materials : (reviewed version) : May 24th-26th 2017, Hotel Voroněž I, Brno, Czech Republic, EU

ISBN

978-80-87294-79-6

ISSN

—

e-ISSN

neuvedeno

Počet stran výsledku

5

Strana od-do

370-374

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

24. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—