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EFFECT OF AUSTENITIZATION TEMPERATURE ON DCCT DIAGRAM 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%3A10253290" target="_blank" >RIV/61989100:27360/23:10253290 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    EFFECT OF AUSTENITIZATION TEMPERATURE ON DCCT DIAGRAM 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. 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.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    20500 - Materials engineering

Result continuities

  • Project

  • 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

    PhD students´ day FMST 2023

  • ISBN

    978-80-248-4697-2

  • ISSN

  • e-ISSN

  • Number of pages

    4

  • Pages from-to

    27-3

  • Publisher name

    Vysoká škola báňská - Technická univerzita Ostrava

  • Place of publication

    Ostrava

  • Event location

    Ostrava

  • Event date

    Jun 15, 2023

  • Type of event by nationality

    CST - Celostátní akce

  • UT code for WoS article