Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 4813-4821 |
| Seitenumfang | 9 |
| Fachzeitschrift | Journal of materials science |
| Jahrgang | 45 |
| Publikationsstatus | Veröffentlicht - 27 Apr. 2010 |
| Extern publiziert | Ja |
Abstract
The crack growth behavior in an ultrafine-grained (UFG) interstitial-free (IF) steel processed by equal channel angular pressing (ECAP) was investigated utilizing miniaturized compact-tension specimens with different microstructural characteristics. The current results demonstrate that both the ECAP processing route and the direction of crack growth with respect to the extrusion direction dictate the crack growth behavior in UFG IF steel. Specifically, the highest crack growth rates and the lowest threshold values were observed for the lowest grain size. Moreover, an unusual deviation from the expected direction of crack expansion was observed, where the deviation depended on the processing route and direction of crack growth. This deviation is attributed to the presence of elongated structures in the microstructure, which were mainly detectable in the UFG IF steel following a small number of pressings, and to a smaller extent in the optimized microstructures. Specifically, these elongated structures formed parallel to the material's plastic flow during ECAP processing and moved the crack away from the expected direction of growth due to the high stress concentration zones they created along with the process-induced damages.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
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in: Journal of materials science, Jahrgang 45, 27.04.2010, S. 4813-4821.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - On the fatigue crack growth-microstructure relationship in ultrafine-grained interstitial-free steel
AU - Niendorf, T.
AU - Rubitschek, F.
AU - Maier, H. J.
AU - Canadinc, D.
AU - Karaman, I.
N1 - Funding information: The help of B. Gorny with CSM is acknowledged. The German part of this study was supported by Deutsche Forschungsgemeinschaft, within the Research Unit Program ‘‘Mecha-nische Eigenschaften und Grenzflächen ultrafeinkörniger Werkstoffe.’’ The U.S. part of this study was supported by the National Science Foundation, contract no. CMMI-0900187, Materials and Surface Engineering Program, Directorate of Engineering, Arlington, VA.
PY - 2010/4/27
Y1 - 2010/4/27
N2 - The crack growth behavior in an ultrafine-grained (UFG) interstitial-free (IF) steel processed by equal channel angular pressing (ECAP) was investigated utilizing miniaturized compact-tension specimens with different microstructural characteristics. The current results demonstrate that both the ECAP processing route and the direction of crack growth with respect to the extrusion direction dictate the crack growth behavior in UFG IF steel. Specifically, the highest crack growth rates and the lowest threshold values were observed for the lowest grain size. Moreover, an unusual deviation from the expected direction of crack expansion was observed, where the deviation depended on the processing route and direction of crack growth. This deviation is attributed to the presence of elongated structures in the microstructure, which were mainly detectable in the UFG IF steel following a small number of pressings, and to a smaller extent in the optimized microstructures. Specifically, these elongated structures formed parallel to the material's plastic flow during ECAP processing and moved the crack away from the expected direction of growth due to the high stress concentration zones they created along with the process-induced damages.
AB - The crack growth behavior in an ultrafine-grained (UFG) interstitial-free (IF) steel processed by equal channel angular pressing (ECAP) was investigated utilizing miniaturized compact-tension specimens with different microstructural characteristics. The current results demonstrate that both the ECAP processing route and the direction of crack growth with respect to the extrusion direction dictate the crack growth behavior in UFG IF steel. Specifically, the highest crack growth rates and the lowest threshold values were observed for the lowest grain size. Moreover, an unusual deviation from the expected direction of crack expansion was observed, where the deviation depended on the processing route and direction of crack growth. This deviation is attributed to the presence of elongated structures in the microstructure, which were mainly detectable in the UFG IF steel following a small number of pressings, and to a smaller extent in the optimized microstructures. Specifically, these elongated structures formed parallel to the material's plastic flow during ECAP processing and moved the crack away from the expected direction of growth due to the high stress concentration zones they created along with the process-induced damages.
UR - http://www.scopus.com/inward/record.url?scp=77955393766&partnerID=8YFLogxK
U2 - 10.1007/s10853-010-4511-7
DO - 10.1007/s10853-010-4511-7
M3 - Article
AN - SCOPUS:77955393766
VL - 45
SP - 4813
EP - 4821
JO - Journal of materials science
JF - Journal of materials science
SN - 0022-2461
ER -