Details
| Original language | English |
|---|---|
| Pages (from-to) | 39-52 |
| Number of pages | 14 |
| Journal | Key Engineering Materials |
| Volume | 378-379 |
| Publication status | Published - 2008 |
| Externally published | Yes |
Abstract
This paper reports on the fatigue performance of an ultrafine-grained (UFG) interstitial-free (IF) steel deformed at various mean stress levels. The UFG microstructure was achieved using equal channel angular extrusion processing at room temperature (RT) and along an "efficient" route, giving way to the formation of high angle grain boundaries (HAGBs) with a high volume fraction. The current study not only confirms the previous finding that a high volume fraction of HAGBs promotes cyclic stability, but also inquires into the role of mean stress level on the cyclic stability. It is shown that the UFG IF steel exhibits a stable cyclic deformation response in the lowcycle fatigue regime within the medium applied mean stress range of -75 to 75 MPa. The corresponding fatigue lives can still be predicted with the Smith-Watson-Topper approach within this range. Furthermore, the present study demonstrates that the evolution of mean strains with cyclic deformation can be linked to the evolution of mean stresses in strain-controlled loading.
Keywords
- Cyclic stress-strain response, Equal channel angular extrusion, Fatigue life, Interstitial-free steel, Mean stress, Ultrafine-grained materials
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Key Engineering Materials, Vol. 378-379, 2008, p. 39-52.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - On the cyclic stability and fatigue performance of ultrafine-grained interstitial-free steel under mean stress
AU - Niendorf, Thomas
AU - Maier, Hans J.
AU - Canadinc, Demircan
AU - Karaman, Ibrahim
PY - 2008
Y1 - 2008
N2 - This paper reports on the fatigue performance of an ultrafine-grained (UFG) interstitial-free (IF) steel deformed at various mean stress levels. The UFG microstructure was achieved using equal channel angular extrusion processing at room temperature (RT) and along an "efficient" route, giving way to the formation of high angle grain boundaries (HAGBs) with a high volume fraction. The current study not only confirms the previous finding that a high volume fraction of HAGBs promotes cyclic stability, but also inquires into the role of mean stress level on the cyclic stability. It is shown that the UFG IF steel exhibits a stable cyclic deformation response in the lowcycle fatigue regime within the medium applied mean stress range of -75 to 75 MPa. The corresponding fatigue lives can still be predicted with the Smith-Watson-Topper approach within this range. Furthermore, the present study demonstrates that the evolution of mean strains with cyclic deformation can be linked to the evolution of mean stresses in strain-controlled loading.
AB - This paper reports on the fatigue performance of an ultrafine-grained (UFG) interstitial-free (IF) steel deformed at various mean stress levels. The UFG microstructure was achieved using equal channel angular extrusion processing at room temperature (RT) and along an "efficient" route, giving way to the formation of high angle grain boundaries (HAGBs) with a high volume fraction. The current study not only confirms the previous finding that a high volume fraction of HAGBs promotes cyclic stability, but also inquires into the role of mean stress level on the cyclic stability. It is shown that the UFG IF steel exhibits a stable cyclic deformation response in the lowcycle fatigue regime within the medium applied mean stress range of -75 to 75 MPa. The corresponding fatigue lives can still be predicted with the Smith-Watson-Topper approach within this range. Furthermore, the present study demonstrates that the evolution of mean strains with cyclic deformation can be linked to the evolution of mean stresses in strain-controlled loading.
KW - Cyclic stress-strain response
KW - Equal channel angular extrusion
KW - Fatigue life
KW - Interstitial-free steel
KW - Mean stress
KW - Ultrafine-grained materials
UR - http://www.scopus.com/inward/record.url?scp=43749121138&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:43749121138
VL - 378-379
SP - 39
EP - 52
JO - Key Engineering Materials
JF - Key Engineering Materials
SN - 1013-9826
ER -