Evaluation of mechanical properties and microstructure of dissimilar weld joint of COST F and FB2 steels after long term creep test

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of mechanical properties and microstructure of dissimilar weld joint of COST F and FB2 steels after long term creep test

Popis výsledku v původním jazyce

Trial dissimilar weld joint was prepared from COST F and COST FB2 type steels using TIG HOT-WIRE method in conditions used in industrial praxis for production welded steam turbine rotor. Long-term creep tests to the rupture of smooth crossweld samples have been carried out at temperatures ranging from 550 to 650°C and at stresses from 70 to 220 MPa. Fractographic analysis, hardness profile measurement and study of submicrostructure using light, scanning and transmission electron microscopy have been performed. Creep strength of weld joint falls into ?20% scatter band of the creep strength of the base material COST F up to 600°C. Different types of cracking were observed in dependency on conditions of creep test: fractures were located in the base material of steel COST F at lower temperatures and higher stresses and in the fine prior austenite grained or intercritically reheated part of heat affected zone of steel COST F where cavitation failure was evident.

Název v anglickém jazyce

Evaluation of mechanical properties and microstructure of dissimilar weld joint of COST F and FB2 steels after long term creep test

Popis výsledku anglicky

Trial dissimilar weld joint was prepared from COST F and COST FB2 type steels using TIG HOT-WIRE method in conditions used in industrial praxis for production welded steam turbine rotor. Long-term creep tests to the rupture of smooth crossweld samples have been carried out at temperatures ranging from 550 to 650°C and at stresses from 70 to 220 MPa. Fractographic analysis, hardness profile measurement and study of submicrostructure using light, scanning and transmission electron microscopy have been performed. Creep strength of weld joint falls into ?20% scatter band of the creep strength of the base material COST F up to 600°C. Different types of cracking were observed in dependency on conditions of creep test: fractures were located in the base material of steel COST F at lower temperatures and higher stresses and in the fine prior austenite grained or intercritically reheated part of heat affected zone of steel COST F where cavitation failure was evident.

Druh

D - Stať ve sborníku

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)

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of International Conference on Life Management and Maintenance for Power Plants Baltica IX, Edited by Pertti Auerkari & Juha Veivo

ISBN

978-951-38-8025-5

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

630-639

Název nakladatele

VTT TECHNOLOGY 106

Místo vydání

Helsinky

Místo konání akce

Helsinky - Stockholm

Datum konání akce

11. 6. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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