Plastic properties of steel AlSI 4140 influenced by strain rate and temperature

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Plastic properties of steel AlSI 4140 influenced by strain rate and temperature

Popis výsledku v původním jazyce

Deformation behavior of continuously cast steel with 0.43 % C, 1.01 % Cr and 0.19 % Mo was studied in the austenite region. Its solidus temperature was calculated as 1435 oC and the nil strength temperature at heating was determined as 1402 oC using a special testing method. Hot ductility was measured by means of the uniaxial tensile tests in wide range of mean strain rate (0.00074 - 63 s-1) and temperature (800 - 1375 oC). At medium strain rate of 0.65 s-1, formability steadily increased to a temperature of approx. 1335 oC and then sharply dropped as a result of overheating and burning of the steel. The nil ductility temperature was determined as 1365 oC in this case. Influence of strain rate on formability was evaluated at two temperature values corresponding to relatively poor and/or good plastic properties. At a temperature of 900 oC, ductility increased rather moderately with the increasing strain rate. At a temperature of 1280 oC, the growth of ductility at increasing strain rate was sharper and both dependencies intersected at a strain rate of approx. 0.008 s-1. Formability was improved by higher temperature at high strain rates and deteriorated at very low strain rates, which is a quite unique result. It was not possible to determine the value of the strain rate corresponding to the local maximum of ductility, even if applying the strain rate range of 6 orders. SEM analysis of the broken samples confirmed the expected influence of microstructure development on hot formability. (C) 2018 TANGER Ltd., Ostrava.

Název v anglickém jazyce

Plastic properties of steel AlSI 4140 influenced by strain rate and temperature

Popis výsledku anglicky

Deformation behavior of continuously cast steel with 0.43 % C, 1.01 % Cr and 0.19 % Mo was studied in the austenite region. Its solidus temperature was calculated as 1435 oC and the nil strength temperature at heating was determined as 1402 oC using a special testing method. Hot ductility was measured by means of the uniaxial tensile tests in wide range of mean strain rate (0.00074 - 63 s-1) and temperature (800 - 1375 oC). At medium strain rate of 0.65 s-1, formability steadily increased to a temperature of approx. 1335 oC and then sharply dropped as a result of overheating and burning of the steel. The nil ductility temperature was determined as 1365 oC in this case. Influence of strain rate on formability was evaluated at two temperature values corresponding to relatively poor and/or good plastic properties. At a temperature of 900 oC, ductility increased rather moderately with the increasing strain rate. At a temperature of 1280 oC, the growth of ductility at increasing strain rate was sharper and both dependencies intersected at a strain rate of approx. 0.008 s-1. Formability was improved by higher temperature at high strain rates and deteriorated at very low strain rates, which is a quite unique result. It was not possible to determine the value of the strain rate corresponding to the local maximum of ductility, even if applying the strain rate range of 6 orders. SEM analysis of the broken samples confirmed the expected influence of microstructure development on hot formability. (C) 2018 TANGER Ltd., Ostrava.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20500 - Materials engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2018 - 27th International Conference on Metallurgy and Materials, Conference Proceedings

ISBN

978-80-87294-84-0

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

401-406

Název nakladatele

TANGER Ltd.

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

23. 5. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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