Details
| Original language | English |
|---|---|
| Pages (from-to) | 1152-1163 |
| Number of pages | 12 |
| Journal | International Journal of Materials Research |
| Volume | 102 |
| Issue number | 9 |
| Publication status | Published - 2011 |
| Externally published | Yes |
Abstract
The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.
Keywords
- Bainite, Phase transformation, Pre-deformation, Supercooled austenite, Superimposed stress
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: International Journal of Materials Research, Vol. 102, No. 9, 2011, p. 1152-1163.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evolution of transformation plasticity during bainitic transformation
AU - Lambers, Hans Gerd
AU - Tschumak, Sergej
AU - Maier, Hans Jürgen
AU - Canadinc, Demircan
PY - 2011
Y1 - 2011
N2 - The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.
AB - The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.
KW - Bainite
KW - Phase transformation
KW - Pre-deformation
KW - Supercooled austenite
KW - Superimposed stress
UR - http://www.scopus.com/inward/record.url?scp=80053371539&partnerID=8YFLogxK
U2 - 10.3139/146.110558
DO - 10.3139/146.110558
M3 - Article
AN - SCOPUS:80053371539
VL - 102
SP - 1152
EP - 1163
JO - International Journal of Materials Research
JF - International Journal of Materials Research
SN - 1862-5282
IS - 9
ER -