Microstructural changes in creep exposed P91 steel weld joint.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F11%3A%230000448" target="_blank" >RIV/47718684:_____/11:#0000448 - isvavai.cz</a>

Výsledek na webu

<a href="http://vzuplzen.cz" target="_blank" >http://vzuplzen.cz</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3184/096034011X13061610296777" target="_blank" >10.3184/096034011X13061610296777</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructural changes in creep exposed P91 steel weld joint.

Popis výsledku v původním jazyce

Cast plates made of 9Cr ? 1MoV creep resistant steel were joined together using the GTAW and SMAW methods. Creep testing was carried out at a temperature range from 525_C to 625_C and a stress range from 50 to 240MPa. The microstructure of crept specimens was compared with weld joint at conditions after PWHT and the base material before welding. Substructures were investigated in the base material, the heat affected zones and the weld metal. Different kinetics of precipitation reactions in individual zones caused changes in creep strength and unexpected transition from Type IV cracking to Type I cracking at long creep exposure at 625_C. After creep tests at temperatures above 550_C for about 30,000 hours, coarse particles of Laves phase were observed.In addition, small plates of Z-phase were detected after creep tests at 625_C. Precipitation of Laves phase occurred in the weld metal predominately and caused depletion of solid solution about molybdenum. If the lowest stress were applie

Název v anglickém jazyce

Microstructural changes in creep exposed P91 steel weld joint.

Popis výsledku anglicky

Cast plates made of 9Cr ? 1MoV creep resistant steel were joined together using the GTAW and SMAW methods. Creep testing was carried out at a temperature range from 525_C to 625_C and a stress range from 50 to 240MPa. The microstructure of crept specimens was compared with weld joint at conditions after PWHT and the base material before welding. Substructures were investigated in the base material, the heat affected zones and the weld metal. Different kinetics of precipitation reactions in individual zones caused changes in creep strength and unexpected transition from Type IV cracking to Type I cracking at long creep exposure at 625_C. After creep tests at temperatures above 550_C for about 30,000 hours, coarse particles of Laves phase were observed.In addition, small plates of Z-phase were detected after creep tests at 625_C. Precipitation of Laves phase occurred in the weld metal predominately and caused depletion of solid solution about molybdenum. If the lowest stress were applie

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/FR-TI2%2F080" target="_blank" >FR-TI2/080: Nové technologie spojování komponent průtočné části turbín pro ultra super kritické parametry páry</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2011

Kód důvěrnosti údajů

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

Název periodika

Materials at high temperatures

ISSN

0960-3409

e-ISSN

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Svazek periodika

28

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

137-146

Kód UT WoS článku

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EID výsledku v databázi Scopus

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