EFFECT OF AUSTENITIZING TEMPERATURE ON THE PHASE TRANSFORMATIONS OF Mn-Cr-Mo PIPE STEEL
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F23%3A10254538" target="_blank" >RIV/61989100:27360/23:10254538 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.37904/metal.2023.4692" target="_blank" >https://doi.org/10.37904/metal.2023.4692</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
EFFECT OF AUSTENITIZING TEMPERATURE ON THE PHASE TRANSFORMATIONS OF Mn-Cr-Mo PIPE STEEL
Original language description
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, i.e. by piercing of the round billet by skew rolling and subsequent longitudinal rolling on a pilgrim mill. 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 oCBULLET OPERATORs-1, the temperature Ac3 = 824 oC was determined dilatometrically for the investigated steel. Subsequently, two different austenitizing 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 austenitizing temperature of 860 oC and/or 1,000 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 0.8oCBULLET OPERATORs-1, 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 1,000 oC.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20500 - Materials engineering
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
METAL 2023 : 32nd International Conference on Metallurgy and Materials : conference proceedings : May 17–19, 2023, OREA Congress Hotel Brno, Czech Republic, EU
ISBN
978-80-88365-12-9
ISSN
2694-9296
e-ISSN
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Number of pages
5
Pages from-to
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Publisher name
Tanger
Place of publication
Ostrava
Event location
Brno
Event date
May 17, 2023
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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