Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00476631" target="_blank" >RIV/68081723:_____/17:00476631 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.4149/km_2017_2_69" target="_blank" >http://dx.doi.org/10.4149/km_2017_2_69</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4149/km_2017_2_69" target="_blank" >10.4149/km_2017_2_69</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Popis výsledku v původním jazyce

In this study, the creep behaviour of P92 steel in as-received condition and after long-term isothermal ageing was investigated at 600 and 650 degrees C using uniaxial tension creep tests. The creep testing was carried out in the power-law creep region. The analyses of creep data indicate that creep behaviour of the steel under investigation obeys both Monkman-Grant and modified Monkman-Grant empirical formulas and provides high values of creep damage factor A. The tertiary creep was examined in terms of the variations of the time to onset of tertiary creep tot with the time to fracture t(f). To assess the effect of damage process on the loss of creep strength, most creep tests were followed by fractographic investigations. It was observed that the large Laves phase particles, which coarsened during creep exposure, served as preferred sites for creep cavity nucleation. The fractography of creep ruptured specimens revealed a dominant transgranular fracture mode by necking at the highest stresses, and a mixture of transgranular and intergranular fracture modes at medium and low-stress regions.

Název v anglickém jazyce

Applicability of empirical formulas and fractography for assessment of creep life and creep fracture modes of tempered martensitic 9%Cr steel

Popis výsledku anglicky

In this study, the creep behaviour of P92 steel in as-received condition and after long-term isothermal ageing was investigated at 600 and 650 degrees C using uniaxial tension creep tests. The creep testing was carried out in the power-law creep region. The analyses of creep data indicate that creep behaviour of the steel under investigation obeys both Monkman-Grant and modified Monkman-Grant empirical formulas and provides high values of creep damage factor A. The tertiary creep was examined in terms of the variations of the time to onset of tertiary creep tot with the time to fracture t(f). To assess the effect of damage process on the loss of creep strength, most creep tests were followed by fractographic investigations. It was observed that the large Laves phase particles, which coarsened during creep exposure, served as preferred sites for creep cavity nucleation. The fractography of creep ruptured specimens revealed a dominant transgranular fracture mode by necking at the highest stresses, and a mixture of transgranular and intergranular fracture modes at medium and low-stress regions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

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

2017

Kód důvěrnosti údajů

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

Název periodika

Kovové materiály

ISSN

0023-432X

e-ISSN

—

Svazek periodika

55

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

12

Strana od-do

69-80

Kód UT WoS článku

000400952500001

EID výsledku v databázi Scopus

2-s2.0-85018785093