EFFECT OF AUSTENITIZATION TEMPERATURE ON DCCT DIAGRAM OF MN-CR-MO PIPE STEEL

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

EFFECT OF AUSTENITIZATION TEMPERATURE ON DCCT DIAGRAM OF MN-CR-MO PIPE STEEL

Popis výsledku v původním jazyce

The steel with 0.3% C - 1.2% Mn - 0.8% Cr - 0.2% Mo is intended for the production of seamless pipes in the Mannesmann method. The heating and finishing temperatures are relatively high and it is therefore necessary to know the continuous cooling transformation (CCT) diagrams in a wider range of temperature conditions. At a heating rate of 0.167 oC/s, the temperature Ac3 = 824 oC was determined dilatometrically for the investigated steel. Subsequently, two different austenitization temperatures were chosen for dilatometric tests. Continuous cooling transformation diagrams with previous deformation (DCCT) were constructed after the compressive true strain of 0.35 with the strain rate of 1 s-1, carried out at the appropriate austenitization temperature of 860 oC and/or 1000 oC. Dilatometric curves were obtained after cooling at constant rates in the range of 0.1 - 35 oC/s. Their mathematical processing was combined with metallographic analysis and hardness measurement of selected samples. After cooling at rates lower than about 0.8oC/s, the structure consisted of ferrite, bainite and pearlite in varying proportions. Higher cooling rates led to an increasing share of martensite. In the high-temperature DCCT diagram, bainite plays a more significant role, and both the Ferrite-start and Pearlite-start curves are shifted towards longer times. This can be explained by the coarser initial austenitic grains after heating the samples to a temperature of 1000 oC.

Název v anglickém jazyce

EFFECT OF AUSTENITIZATION TEMPERATURE ON DCCT DIAGRAM OF MN-CR-MO PIPE STEEL

Popis výsledku anglicky

The steel with 0.3% C - 1.2% Mn - 0.8% Cr - 0.2% Mo is intended for the production of seamless pipes in the Mannesmann method. The heating and finishing temperatures are relatively high and it is therefore necessary to know the continuous cooling transformation (CCT) diagrams in a wider range of temperature conditions. At a heating rate of 0.167 oC/s, the temperature Ac3 = 824 oC was determined dilatometrically for the investigated steel. Subsequently, two different austenitization temperatures were chosen for dilatometric tests. Continuous cooling transformation diagrams with previous deformation (DCCT) were constructed after the compressive true strain of 0.35 with the strain rate of 1 s-1, carried out at the appropriate austenitization temperature of 860 oC and/or 1000 oC. Dilatometric curves were obtained after cooling at constant rates in the range of 0.1 - 35 oC/s. Their mathematical processing was combined with metallographic analysis and hardness measurement of selected samples. After cooling at rates lower than about 0.8oC/s, the structure consisted of ferrite, bainite and pearlite in varying proportions. Higher cooling rates led to an increasing share of martensite. In the high-temperature DCCT diagram, bainite plays a more significant role, and both the Ferrite-start and Pearlite-start curves are shifted towards longer times. This can be explained by the coarser initial austenitic grains after heating the samples to a temperature of 1000 oC.

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

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

PhD students´ day FMST 2023

ISBN

978-80-248-4697-2

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

27-3

Název nakladatele

Vysoká škola báňská - Technická univerzita Ostrava

Místo vydání

Ostrava

Místo konání akce

Ostrava

Datum konání akce

15. 6. 2023

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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