The influence of post bend heat treatment on material properties and creep resistance of a pipeline bend

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F21%3AN0000032" target="_blank" >RIV/25870807:_____/21:N0000032 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.confer.cz/metal/2021/4157-the-influence-of-post-bend-heat-treatment-on-material-properties-and-creep-resistance-of-a-pipeline-bend" target="_blank" >https://www.confer.cz/metal/2021/4157-the-influence-of-post-bend-heat-treatment-on-material-properties-and-creep-resistance-of-a-pipeline-bend</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The influence of post bend heat treatment on material properties and creep resistance of a pipeline bend

Popis výsledku v původním jazyce

The temperature of the hot bending of creep resistant steels is usually performed above the transition temperature Ac3. The steel thus undergoes a short-term austenitization followed by martensitic and/or bainitic transformation during subsequent fast cooling. Especially in the case of alloyed steels the austenitization is too short to allow dissolution of special carbides and/or nitrides, which results in the bimodal distribution of these secondary phases after bending. In order to guarantee the required material properties as well as homogeneous final microstructure after bending, it is necessary to perform the complete post bend heat treatment (PBHT) comprising of normalizing and tempering. In order to verify the influence of omitted normalization after bending on the material properties of a pipe bend made of 0.5Cr-0.5Mo-0.3V heat resistant steel, two different heat treatment modes were applied after a heat cycle simulating hot bending, the first inclusive normalizing and tempering and the second where the material was only tempered. Comprehensive analysis of mechanical properties, microstructure, substructure and creep resistance was then performed to confirm the effect of PBHT regime on material behaviour.

Název v anglickém jazyce

The influence of post bend heat treatment on material properties and creep resistance of a pipeline bend

Popis výsledku anglicky

The temperature of the hot bending of creep resistant steels is usually performed above the transition temperature Ac3. The steel thus undergoes a short-term austenitization followed by martensitic and/or bainitic transformation during subsequent fast cooling. Especially in the case of alloyed steels the austenitization is too short to allow dissolution of special carbides and/or nitrides, which results in the bimodal distribution of these secondary phases after bending. In order to guarantee the required material properties as well as homogeneous final microstructure after bending, it is necessary to perform the complete post bend heat treatment (PBHT) comprising of normalizing and tempering. In order to verify the influence of omitted normalization after bending on the material properties of a pipe bend made of 0.5Cr-0.5Mo-0.3V heat resistant steel, two different heat treatment modes were applied after a heat cycle simulating hot bending, the first inclusive normalizing and tempering and the second where the material was only tempered. Comprehensive analysis of mechanical properties, microstructure, substructure and creep resistance was then performed to confirm the effect of PBHT regime on material behaviour.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název statě ve sborníku

Metal 2021

ISBN

978-80-87294-99-4

ISSN

2694-9296

e-ISSN

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Počet stran výsledku

6

Strana od-do

562-567

Název nakladatele

Tanger s.r.o.

Místo vydání

Brno

Místo konání akce

Virtuální konference

Datum konání akce

26. 5. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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