Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing
The 22 wt.% Cr, fully ferritic stainless steel Crofer<sup>®</sup>22 H has higher thermomechanical fatigue (TMF)- lifetime compared to advanced ferritic-martensitic P91, which is assumed to be caused by different damage tolerance, leading to differences in crack propagation and failure me...
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MDPI AG
2020-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/18/6461 |
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| author | Bastian Blinn David Görzen Torsten Fischer Bernd Kuhn Tilmann Beck |
| author_facet | Bastian Blinn David Görzen Torsten Fischer Bernd Kuhn Tilmann Beck |
| author_sort | Bastian Blinn |
| collection | DOAJ |
| description | The 22 wt.% Cr, fully ferritic stainless steel Crofer<sup>®</sup>22 H has higher thermomechanical fatigue (TMF)- lifetime compared to advanced ferritic-martensitic P91, which is assumed to be caused by different damage tolerance, leading to differences in crack propagation and failure mechanisms. To analyze this, instrumented cyclic indentation tests (CITs) were used because the material’s cyclic hardening potential—which strongly correlates with damage tolerance, can be determined by analyzing the deformation behavior in CITs. In the presented work, CITs were performed for both materials at specimens loaded for different numbers of TMF-cycles. These investigations show higher damage tolerance for Crofer<sup>®</sup>22 H and demonstrate changes in damage tolerance during TMF-loading for both materials, which correlates with the cyclic deformation behavior observed in TMF-tests. Furthermore, the results obtained at Crofer<sup>®</sup>22 H indicate an increase of damage tolerance in the second half of TMF-lifetime, which cannot be observed for P91. Moreover, CITs were performed at Crofer<sup>®</sup>22 H in the vicinity of a fatigue crack, enabling to locally analyze the damage tolerance. These CITs show differences between crack edges and the crack tip. Conclusively, the presented results demonstrate that CITs can be utilized to analyze TMF-induced changes in damage tolerance. |
| first_indexed | 2024-03-10T16:16:43Z |
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| id | doaj.art-195dd934114e4dccb1b0a2c02d0e7117 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T16:16:43Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-195dd934114e4dccb1b0a2c02d0e71172023-11-20T13:58:54ZengMDPI AGApplied Sciences2076-34172020-09-011018646110.3390/app10186461Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation TestingBastian Blinn0David Görzen1Torsten Fischer2Bernd Kuhn3Tilmann Beck4Institute of Materials Science and Engineering, TU Kaiserslautern, 67663 Kaiserslautern, GermanyInstitute of Materials Science and Engineering, TU Kaiserslautern, 67663 Kaiserslautern, GermanyForschungszentrum Juelich GmbH, Institute of Energy and Climate Research (IEK), Microstructure and Properties of Materials (IEK-2), 52428 Juelich, GermanyForschungszentrum Juelich GmbH, Institute of Energy and Climate Research (IEK), Microstructure and Properties of Materials (IEK-2), 52428 Juelich, GermanyInstitute of Materials Science and Engineering, TU Kaiserslautern, 67663 Kaiserslautern, GermanyThe 22 wt.% Cr, fully ferritic stainless steel Crofer<sup>®</sup>22 H has higher thermomechanical fatigue (TMF)- lifetime compared to advanced ferritic-martensitic P91, which is assumed to be caused by different damage tolerance, leading to differences in crack propagation and failure mechanisms. To analyze this, instrumented cyclic indentation tests (CITs) were used because the material’s cyclic hardening potential—which strongly correlates with damage tolerance, can be determined by analyzing the deformation behavior in CITs. In the presented work, CITs were performed for both materials at specimens loaded for different numbers of TMF-cycles. These investigations show higher damage tolerance for Crofer<sup>®</sup>22 H and demonstrate changes in damage tolerance during TMF-loading for both materials, which correlates with the cyclic deformation behavior observed in TMF-tests. Furthermore, the results obtained at Crofer<sup>®</sup>22 H indicate an increase of damage tolerance in the second half of TMF-lifetime, which cannot be observed for P91. Moreover, CITs were performed at Crofer<sup>®</sup>22 H in the vicinity of a fatigue crack, enabling to locally analyze the damage tolerance. These CITs show differences between crack edges and the crack tip. Conclusively, the presented results demonstrate that CITs can be utilized to analyze TMF-induced changes in damage tolerance.https://www.mdpi.com/2076-3417/10/18/6461cyclic hardening potentialdamage tolerancemicrostructural evolutioncyclic indentation testthermomechanical fatiguePhyBaL<sub>CHT</sub> |
| spellingShingle | Bastian Blinn David Görzen Torsten Fischer Bernd Kuhn Tilmann Beck Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing Applied Sciences cyclic hardening potential damage tolerance microstructural evolution cyclic indentation test thermomechanical fatigue PhyBaL<sub>CHT</sub> |
| title | Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing |
| title_full | Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing |
| title_fullStr | Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing |
| title_full_unstemmed | Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing |
| title_short | Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer<sup>®</sup>22 H with Cyclic Indentation Testing |
| title_sort | analysis of the thermomechanical fatigue behavior of fully ferritic high chromium steel crofer sup r sup 22 h with cyclic indentation testing |
| topic | cyclic hardening potential damage tolerance microstructural evolution cyclic indentation test thermomechanical fatigue PhyBaL<sub>CHT</sub> |
| url | https://www.mdpi.com/2076-3417/10/18/6461 |
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