Behaviour of ODS Steels in Cyclic Loading

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Behaviour of ODS Steels in Cyclic Loading

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JL - Fatigue and fracture mechanics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Indian Institute of Metals. Transactions

ISSN

0972-2815

e-ISSN

—

Volume of the periodical

69

Issue of the periodical within the volume

2

Country of publishing house

IN - INDIA

Number of pages

5

Pages from-to

309-313

UT code for WoS article

000368032700022

EID of the result in the Scopus database

2-s2.0-84954391248