TY  - JOUR
AU  - Blinn, Bastian
AU  - Görzen, David
AU  - Fischer, Torsten
AU  - Kuhn, Bernd
AU  - Beck, Tilmann
TI  - Analysis of the Thermomechanical Fatigue Behavior of Fully Ferritic High Chromium Steel Crofer®22 H with Cyclic Indentation Testing
JO  - Applied Sciences
VL  - 10
IS  - 18
SN  - 2076-3417
CY  - Basel
PB  - MDPI
M1  - FZJ-2020-03169
SP  - 6461 -
PY  - 2020
AB  - The 22 wt.% Cr, fully ferritic stainless steel Crofer®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®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®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®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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000580510700001
DO  - DOI:10.3390/app10186461
UR  - https://juser.fz-juelich.de/record/884274
ER  -