Details
| Original language | English |
|---|---|
| Pages (from-to) | 100-108 |
| Number of pages | 9 |
| Journal | Materials characterization |
| Volume | 65 |
| Publication status | Published - 15 Jan 2012 |
| Externally published | Yes |
Abstract
This paper elucidates the stress-induced variant selection process during the isothermal austenite-to-bainite phase transformation in a tool steel. Specifically, a thorough set of experiments combining electron backscatter diffraction and in-situ digital image correlation (DIC) was carried out to establish the role of superimposed stress level on the evolution of transformation plasticity (TP) strains. The important finding is that TP increases concomitant with the superimposed stress level, and strain localization accompanies phase transformation at all stress levels considered. Furthermore, TP strain distribution within the whole material becomes more homogeneous with increasing stress, such that fewer bainitic variants are selected to grow under higher stresses, yielding a more homogeneous strain distribution. In particular, the bainitic variants oriented along [101] and [201] directions are favored to grow parallel to the loading axis and are associated with large TP strains. Overall, this very first in-situ DIC investigation of the austenite-to-bainite phase transformation in steels evidences the clear relationship between the superimposed stress level, variant selection, and evolution of TP strains.
Keywords
- Austenitization, Bainite, Digital image correlation, Phase transformation, Transformation plasticity
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials characterization, Vol. 65, 15.01.2012, p. 100-108.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - In-situ characterization of transformation plasticity during an isothermal austenite-to-bainite phase transformation
AU - Holzweissig, M. J.
AU - Canadinc, D.
AU - Maier, H. J.
N1 - Funding information: Financial support by Deutsche Forschungsgemeinschaft within the Transregional Collaborative Research Center TRR 30 “Prozessintegrierte Herstellung funktional gradierter Strukturen auf der Grundlage thermo-mechanisch gekoppelter Phänomene” is gratefully acknowledged. D. Canadinc acknowledges financial support by the Turkish Academy of Sciences (TÜBA) within the Young Scientist Award Program (GEB?P).
PY - 2012/1/15
Y1 - 2012/1/15
N2 - This paper elucidates the stress-induced variant selection process during the isothermal austenite-to-bainite phase transformation in a tool steel. Specifically, a thorough set of experiments combining electron backscatter diffraction and in-situ digital image correlation (DIC) was carried out to establish the role of superimposed stress level on the evolution of transformation plasticity (TP) strains. The important finding is that TP increases concomitant with the superimposed stress level, and strain localization accompanies phase transformation at all stress levels considered. Furthermore, TP strain distribution within the whole material becomes more homogeneous with increasing stress, such that fewer bainitic variants are selected to grow under higher stresses, yielding a more homogeneous strain distribution. In particular, the bainitic variants oriented along [101] and [201] directions are favored to grow parallel to the loading axis and are associated with large TP strains. Overall, this very first in-situ DIC investigation of the austenite-to-bainite phase transformation in steels evidences the clear relationship between the superimposed stress level, variant selection, and evolution of TP strains.
AB - This paper elucidates the stress-induced variant selection process during the isothermal austenite-to-bainite phase transformation in a tool steel. Specifically, a thorough set of experiments combining electron backscatter diffraction and in-situ digital image correlation (DIC) was carried out to establish the role of superimposed stress level on the evolution of transformation plasticity (TP) strains. The important finding is that TP increases concomitant with the superimposed stress level, and strain localization accompanies phase transformation at all stress levels considered. Furthermore, TP strain distribution within the whole material becomes more homogeneous with increasing stress, such that fewer bainitic variants are selected to grow under higher stresses, yielding a more homogeneous strain distribution. In particular, the bainitic variants oriented along [101] and [201] directions are favored to grow parallel to the loading axis and are associated with large TP strains. Overall, this very first in-situ DIC investigation of the austenite-to-bainite phase transformation in steels evidences the clear relationship between the superimposed stress level, variant selection, and evolution of TP strains.
KW - Austenitization
KW - Bainite
KW - Digital image correlation
KW - Phase transformation
KW - Transformation plasticity
UR - http://www.scopus.com/inward/record.url?scp=84856587337&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2012.01.007
DO - 10.1016/j.matchar.2012.01.007
M3 - Article
AN - SCOPUS:84856587337
VL - 65
SP - 100
EP - 108
JO - Materials characterization
JF - Materials characterization
SN - 1044-5803
ER -