Microstructure Stability of HR3C Welded Steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F18%3AN0000121" target="_blank" >RIV/26722445:_____/18:N0000121 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure Stability of HR3C Welded Steel

Popis výsledku v původním jazyce

The most recent blocks of fossil fuel power plants worked for steam temperatures above 600 °C they need advanced stainless steels in superheater systems. Is investigated exploitation of new steel grades with higher material properties. In the area of austenitic steels, the perspective grade is undoubtedly HR3C steel (X6CrNiNbN 25-20). In terms of the use of similar weld joints made of HR3C steel in fossil fuel power plants, detailed knowledge on microstructural stability of these weld joints is primary. Similar weld joints made of HR3C steel tubes were manufactured using a combination of GTAW and SMAW welding technologies. Weld joints were studied in both the as-welded state (PW), and after post-weld heat treatment (PWHT) at 1230 °C for 15 minutes. The paper presents the results of microstructure investigation on cross-weld samples tested at 650 and 700 °C. Metallographic analysis was performed on longitudinal sections of creep ruptured samples, microstructures of the same areas, states of heat-treatment and different conditions are compared and microhardness HV 0.5 profiles over cross-weld samples were determined. The paper analyses the preferential rupture locations of the HR3C similar weld joints in dependence on the temperature of creep exposure and applied stress.

Název v anglickém jazyce

Microstructure Stability of HR3C Welded Steel

Popis výsledku anglicky

The most recent blocks of fossil fuel power plants worked for steam temperatures above 600 °C they need advanced stainless steels in superheater systems. Is investigated exploitation of new steel grades with higher material properties. In the area of austenitic steels, the perspective grade is undoubtedly HR3C steel (X6CrNiNbN 25-20). In terms of the use of similar weld joints made of HR3C steel in fossil fuel power plants, detailed knowledge on microstructural stability of these weld joints is primary. Similar weld joints made of HR3C steel tubes were manufactured using a combination of GTAW and SMAW welding technologies. Weld joints were studied in both the as-welded state (PW), and after post-weld heat treatment (PWHT) at 1230 °C for 15 minutes. The paper presents the results of microstructure investigation on cross-weld samples tested at 650 and 700 °C. Metallographic analysis was performed on longitudinal sections of creep ruptured samples, microstructures of the same areas, states of heat-treatment and different conditions are compared and microhardness HV 0.5 profiles over cross-weld samples were determined. The paper analyses the preferential rupture locations of the HR3C similar weld joints in dependence on the temperature of creep exposure and applied stress.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Advanced Technologies for Gen. IV Reactors - October 18th 2018

ISBN

978-80-270-5393-3

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

55-60

Název nakladatele

Centrum výzkumu Řež, s.r.o.

Místo vydání

Řež

Místo konání akce

Řež

Datum konání akce

18. 10. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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