Different Types of Crackings of P91 Steel Weld Joints after Long-term Creep Tests

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

Different Types of Crackings of P91 Steel Weld Joints after Long-term Creep Tests

Popis výsledku v původním jazyce

The paper deals with creep testing and microstructural investigation of trial weld joints prepared of wrought and cast 9Cr-1Mo-V steels. Creep testing was carried out at temperature range from 525°C to 625°C, the longest time to rupture of 45,811 hrs wasachieved. Different types of cracking were observed in dependency on conditions of creep test and the type of weld joint. Type I and Type II fractures occurred at high applied stresses at relatively low temperatures in the tube weld joint and also in two specimens of the cast plate weld joint after creep test at the lowest temperature and the highest temperature. All other fractures were of the Type IV. Two processes occur simultaneously, which result in the creep dam-age: i) softening of solid solution as a result of Laves phase precipitation and ii) formation and coalescence of cavities in the soft fine grained parts of heat af-fected zone.

Název v anglickém jazyce

Different Types of Crackings of P91 Steel Weld Joints after Long-term Creep Tests

Popis výsledku anglicky

The paper deals with creep testing and microstructural investigation of trial weld joints prepared of wrought and cast 9Cr-1Mo-V steels. Creep testing was carried out at temperature range from 525°C to 625°C, the longest time to rupture of 45,811 hrs wasachieved. Different types of cracking were observed in dependency on conditions of creep test and the type of weld joint. Type I and Type II fractures occurred at high applied stresses at relatively low temperatures in the tube weld joint and also in two specimens of the cast plate weld joint after creep test at the lowest temperature and the highest temperature. All other fractures were of the Type IV. Two processes occur simultaneously, which result in the creep dam-age: i) softening of solid solution as a result of Laves phase precipitation and ii) formation and coalescence of cavities in the soft fine grained parts of heat af-fected zone.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název statě ve sborníku

BALTICA VIII ? International Conference on Life Management and Maintenance for Power Plants

ISBN

978-951-38-7594-7

ISSN

0357-9387

e-ISSN

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Počet stran výsledku

16

Strana od-do

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Název nakladatele

VTT Technical Research Centre of Finland

Místo vydání

Helsinky

Místo konání akce

Helsinky-Stockholm

Datum konání akce

1. 1. 2010

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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