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| Content Provider | Springer Nature Link |
|---|---|
| Author | Kuběna, Ivo Kruml, Tomáš Polák, Jaroslav |
| Copyright Year | 2016 |
| Abstract | 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. |
| Starting Page | 309 |
| Ending Page | 313 |
| Page Count | 5 |
| File Format | |
| ISSN | 09722815 |
| Journal | Transactions of the Indian Institute of Metals |
| Volume Number | 69 |
| Issue Number | 2 |
| e-ISSN | 09751645 |
| Language | English |
| Publisher | Springer India |
| Publisher Date | 2016-01-02 |
| Publisher Place | New Delhi |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | ODS steels Low cycle fatigue Small fatigue crack Microstructure Metallic Materials Materials Science Tribology, Corrosion and Coatings |
| Content Type | Text |
| Resource Type | Article |
| Subject | Metals and Alloys |
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