Behaviour of ODS Steels in Cyclic Loading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00465625" target="_blank" >RIV/68081723:_____/16:00465625 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s12666-015-0814-3" target="_blank" >http://dx.doi.org/10.1007/s12666-015-0814-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12666-015-0814-3" target="_blank" >10.1007/s12666-015-0814-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Behaviour of ODS Steels in Cyclic Loading

Popis výsledku v původním jazyce

The low cycle fatigue behaviour of several high chromium oxide dispersion strengthened (ODS) steels prepared by powder metallurgy was studied in a detailed way. Studied ODS steels were divided into two groups, ultrafine grained (UFG—grain size under 1 μm) and coarse grained (CG—grain size of 200 μm). Microstructure of as received state of individual steels was observed by means of SEM and TEM. Cyclic hardening/softening curves were measured at room temperature and at 650 °C. It is shown that 0.3 wt% of oxide nanoparticles strengthen the materials substantially and reduces the cyclic softening compared to non-ODS steels. Cyclic softening was measured in CG steel and in UFG ODS ferritic/martensitic steel at room temperature, but stable cyclic behaviour was observed at 650 °C. UFG ODS ferritic steels exhibited stable cyclic behaviour at both testing temperatures. Derived Wöhler and Coffin-Manson curves were measured and substantial differences in fatigue life were revealed. Crack initiation mechanisms and fatigue crack growth rate were analysed. The crack initiation mechanism differs for studied steels, as well as fatigue crack growth rate. The relative length of nucleation and propagation stages of the fatigue life is discussed for individual materials. TEM observations revealed differences in microstructure evolution during fatigue loading in particular steels. All results are thoroughly discussed to explain differences in fatigue life of studied steels.

Název v anglickém jazyce

Behaviour of ODS Steels in Cyclic Loading

Popis výsledku anglicky

The low cycle fatigue behaviour of several high chromium oxide dispersion strengthened (ODS) steels prepared by powder metallurgy was studied in a detailed way. Studied ODS steels were divided into two groups, ultrafine grained (UFG—grain size under 1 μm) and coarse grained (CG—grain size of 200 μm). Microstructure of as received state of individual steels was observed by means of SEM and TEM. Cyclic hardening/softening curves were measured at room temperature and at 650 °C. It is shown that 0.3 wt% of oxide nanoparticles strengthen the materials substantially and reduces the cyclic softening compared to non-ODS steels. Cyclic softening was measured in CG steel and in UFG ODS ferritic/martensitic steel at room temperature, but stable cyclic behaviour was observed at 650 °C. UFG ODS ferritic steels exhibited stable cyclic behaviour at both testing temperatures. Derived Wöhler and Coffin-Manson curves were measured and substantial differences in fatigue life were revealed. Crack initiation mechanisms and fatigue crack growth rate were analysed. The crack initiation mechanism differs for studied steels, as well as fatigue crack growth rate. The relative length of nucleation and propagation stages of the fatigue life is discussed for individual materials. TEM observations revealed differences in microstructure evolution during fatigue loading in particular steels. All results are thoroughly discussed to explain differences in fatigue life of studied steels.

Druh

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

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

—

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Indian Institute of Metals. Transactions

ISSN

0972-2815

e-ISSN

—

Svazek periodika

69

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

IN - Indická republika

Počet stran výsledku

5

Strana od-do

309-313

Kód UT WoS článku

000368032700022

EID výsledku v databázi Scopus

2-s2.0-84954391248