Abstract
A compressive split-Hopkinson pressure bar and transmission electron microscope (TEM) are used to investigate the mechanical behaviour and microstructural evolution of Inconel 718 at strain rates ranging from 1000 to 5000s -1 and temperatures between -150 and 550°C. The results show that the flow stress increases with an increasing strain rate or a reducing temperature. The strain rate effect is particularly pronounced at strain rates greater than 3000s -1 and a deformation temperature of -150°C. A significant thermal softening effect occurs at temperatures between -150 and 25°C. The microstructural observations reveal that the strengthening effect in deformed Inconel 718 alloy is a result primarily of dislocation multiplication. The dislocation density increases with increasing strain rate, but decreases with increasing temperature. By contrast, the dislocation cell size decreases with increasing strain rate, but increases with increasing temperature. It is shown that the correlation between the flow stress, the dislocation density and the dislocation cell size is well described by the Bailey-Hirsch constitutive equations.
| Original language | English |
|---|---|
| Pages (from-to) | 6279-6286 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering A |
| Volume | 528 |
| Issue number | 19-20 |
| DOIs | |
| Publication status | Published - 2011 Jul 25 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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Dynamic mechanical behaviour and dislocation substructure evolution of Inconel 718 over wide temperature range. / Lee, Woei-Shyan; Lin, Chi Feng; Chen, Tao Hsing; Chen, Hong Wei.
In: Materials Science and Engineering A, Vol. 528, No. 19-20, 25.07.2011, p. 6279-6286.Research output: Contribution to journal › Article
TY - JOUR
T1 - Dynamic mechanical behaviour and dislocation substructure evolution of Inconel 718 over wide temperature range
AU - Lee, Woei-Shyan
AU - Lin, Chi Feng
AU - Chen, Tao Hsing
AU - Chen, Hong Wei
PY - 2011/7/25
Y1 - 2011/7/25
N2 - A compressive split-Hopkinson pressure bar and transmission electron microscope (TEM) are used to investigate the mechanical behaviour and microstructural evolution of Inconel 718 at strain rates ranging from 1000 to 5000s -1 and temperatures between -150 and 550°C. The results show that the flow stress increases with an increasing strain rate or a reducing temperature. The strain rate effect is particularly pronounced at strain rates greater than 3000s -1 and a deformation temperature of -150°C. A significant thermal softening effect occurs at temperatures between -150 and 25°C. The microstructural observations reveal that the strengthening effect in deformed Inconel 718 alloy is a result primarily of dislocation multiplication. The dislocation density increases with increasing strain rate, but decreases with increasing temperature. By contrast, the dislocation cell size decreases with increasing strain rate, but increases with increasing temperature. It is shown that the correlation between the flow stress, the dislocation density and the dislocation cell size is well described by the Bailey-Hirsch constitutive equations.
AB - A compressive split-Hopkinson pressure bar and transmission electron microscope (TEM) are used to investigate the mechanical behaviour and microstructural evolution of Inconel 718 at strain rates ranging from 1000 to 5000s -1 and temperatures between -150 and 550°C. The results show that the flow stress increases with an increasing strain rate or a reducing temperature. The strain rate effect is particularly pronounced at strain rates greater than 3000s -1 and a deformation temperature of -150°C. A significant thermal softening effect occurs at temperatures between -150 and 25°C. The microstructural observations reveal that the strengthening effect in deformed Inconel 718 alloy is a result primarily of dislocation multiplication. The dislocation density increases with increasing strain rate, but decreases with increasing temperature. By contrast, the dislocation cell size decreases with increasing strain rate, but increases with increasing temperature. It is shown that the correlation between the flow stress, the dislocation density and the dislocation cell size is well described by the Bailey-Hirsch constitutive equations.
UR - http://www.scopus.com/inward/record.url?scp=79957949187&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79957949187&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2011.04.079
DO - 10.1016/j.msea.2011.04.079
M3 - Article
AN - SCOPUS:79957949187
VL - 528
SP - 6279
EP - 6286
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 19-20
ER -