The effect of strain rate on mechanical properties and retained austenite stability in C-Mn-Si-Al-Nb steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F19%3A43957208" target="_blank" >RIV/49777513:23210/19:43957208 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.metalconference.eu/files/uploads/02//METAL2019_Conference_Proceedings_Content.pdf" target="_blank" >https://www.metalconference.eu/files/uploads/02//METAL2019_Conference_Proceedings_Content.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The effect of strain rate on mechanical properties and retained austenite stability in C-Mn-Si-Al-Nb steel

Popis výsledku v původním jazyce

Low carbon low alloyed steel with partial substitution of silicon by aluminium was thermo-mechanically treated to obtain a multiphase microstructure typical for TRIP (transformation induced plasticity) steels. The processing consisted of soaking at 900°C and two compressive deformations applied during the cooling to the isothermal hold temperature of 425°C. The microstructure was predominantly bainitic with about 17% of retained austenite and little proeutectoid ferrite. The samples underwent tensile test with five different strain rates, 0.003, 0.3, 1, 10, 100 s-1. Mechanical properties show some dependency on strain rate, tensile strengths of 832-925 MPa were achieved together with total elongation of 30-38%. Significantly higher strain rates of 380, 470 and 520 s-1 were produced by impact test with various initial positions of the pendulum (90°, 120°, 150°). In these cases, only the impact energy was evaluated, showing the increasing values with increasing deformation rate. The effect of increasing strain rate on the stability of retained austenite was also evaluated by the means of X-ray diffraction phase analyses. The microstructure after the straining was documented by scanning electron microscopy, as well as fracture surfaces.

Název v anglickém jazyce

The effect of strain rate on mechanical properties and retained austenite stability in C-Mn-Si-Al-Nb steel

Popis výsledku anglicky

Low carbon low alloyed steel with partial substitution of silicon by aluminium was thermo-mechanically treated to obtain a multiphase microstructure typical for TRIP (transformation induced plasticity) steels. The processing consisted of soaking at 900°C and two compressive deformations applied during the cooling to the isothermal hold temperature of 425°C. The microstructure was predominantly bainitic with about 17% of retained austenite and little proeutectoid ferrite. The samples underwent tensile test with five different strain rates, 0.003, 0.3, 1, 10, 100 s-1. Mechanical properties show some dependency on strain rate, tensile strengths of 832-925 MPa were achieved together with total elongation of 30-38%. Significantly higher strain rates of 380, 470 and 520 s-1 were produced by impact test with various initial positions of the pendulum (90°, 120°, 150°). In these cases, only the impact energy was evaluated, showing the increasing values with increasing deformation rate. The effect of increasing strain rate on the stability of retained austenite was also evaluated by the means of X-ray diffraction phase analyses. The microstructure after the straining was documented by scanning electron microscopy, as well as fracture surfaces.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

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 2019-28th International Conference on Metallurgy and Materials, Conference Proceedings

ISBN

978-80-87294-92-5

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

740-745

Název nakladatele

Tanger Ltd.

Místo vydání

Ostrava

Místo konání akce

Brno, Česko

Datum konání akce

22. 5. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000539487400119