Details
| Original language | English |
|---|---|
| Pages (from-to) | 166-175 |
| Number of pages | 10 |
| Journal | Materials Science and Engineering A |
| Volume | 604 |
| Publication status | Published - 17 Mar 2014 |
Abstract
We investigate the kinetics of the structural deformation and hardening of single-crystalline austenitic Fe-13Mn-1.3C (Hadfield steel), Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C (in wt%) steels with different stacking-fault energies after cold high-pressure torsion. Independently of the stacking-fault energy, mechanical twinning was found to be the basic deformation mechanism responsible for the rapid generation of an ultrafine-grained microstructure with a high volume fraction of twin boundaries. Under high-pressure torsion, the spacing between twin boundaries increases, and the dislocation density and microhardness decrease as the stacking-fault energy increases. The formation of a twin net from the beginning of plastic flow in Fe-13Mn-1.3C steel provides a homogeneous distribution of microhardness values across the discs independent of strain under torsion. Lower hardness values in the disk centers compared to the periphery were observed for the two other steels, Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C, with higher stacking-fault energies due to changes in the densities of the twin boundaries. An additional increase in the dislocation density for the Fe-13Mn-1.3C steel was detected compared with the Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C steels, which was a result of torsion in the temperature range of dynamic strain aging. The appearance of small fractions of ε and α' phases in the structures of the Fe-13Mn-1.3C, Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C steels is discussed.
Keywords
- Austenite, High-pressure torsion, Microstructure, Stacking-fault energy, Steel, Twinning
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 Science and Engineering A, Vol. 604, 17.03.2014, p. 166-175.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microstructure and mechanical response of single-crystalline high-manganese austenitic steels under high-pressure torsion
T2 - The effect of stacking-fault energy
AU - Astafurova, E. G.
AU - Tukeeva, M. S.
AU - Maier, G. G.
AU - Melnikov, E. V.
AU - Maier, H. J.
N1 - Funding information: The authors wish to thank Professor Y. Chumlyakov for providing the single crystals and for fruitful discussions. This research was partially supported by the Russian Ministry of Education and Science (Contract no. 8749 , 01.10.2012) and Russian President Scholarship (SP-4384.2013.1).
PY - 2014/3/17
Y1 - 2014/3/17
N2 - We investigate the kinetics of the structural deformation and hardening of single-crystalline austenitic Fe-13Mn-1.3C (Hadfield steel), Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C (in wt%) steels with different stacking-fault energies after cold high-pressure torsion. Independently of the stacking-fault energy, mechanical twinning was found to be the basic deformation mechanism responsible for the rapid generation of an ultrafine-grained microstructure with a high volume fraction of twin boundaries. Under high-pressure torsion, the spacing between twin boundaries increases, and the dislocation density and microhardness decrease as the stacking-fault energy increases. The formation of a twin net from the beginning of plastic flow in Fe-13Mn-1.3C steel provides a homogeneous distribution of microhardness values across the discs independent of strain under torsion. Lower hardness values in the disk centers compared to the periphery were observed for the two other steels, Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C, with higher stacking-fault energies due to changes in the densities of the twin boundaries. An additional increase in the dislocation density for the Fe-13Mn-1.3C steel was detected compared with the Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C steels, which was a result of torsion in the temperature range of dynamic strain aging. The appearance of small fractions of ε and α' phases in the structures of the Fe-13Mn-1.3C, Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C steels is discussed.
AB - We investigate the kinetics of the structural deformation and hardening of single-crystalline austenitic Fe-13Mn-1.3C (Hadfield steel), Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C (in wt%) steels with different stacking-fault energies after cold high-pressure torsion. Independently of the stacking-fault energy, mechanical twinning was found to be the basic deformation mechanism responsible for the rapid generation of an ultrafine-grained microstructure with a high volume fraction of twin boundaries. Under high-pressure torsion, the spacing between twin boundaries increases, and the dislocation density and microhardness decrease as the stacking-fault energy increases. The formation of a twin net from the beginning of plastic flow in Fe-13Mn-1.3C steel provides a homogeneous distribution of microhardness values across the discs independent of strain under torsion. Lower hardness values in the disk centers compared to the periphery were observed for the two other steels, Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C, with higher stacking-fault energies due to changes in the densities of the twin boundaries. An additional increase in the dislocation density for the Fe-13Mn-1.3C steel was detected compared with the Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C steels, which was a result of torsion in the temperature range of dynamic strain aging. The appearance of small fractions of ε and α' phases in the structures of the Fe-13Mn-1.3C, Fe-13Mn-2.7Al-1.3C, and Fe-28Mn-2.7Al-1.3C steels is discussed.
KW - Austenite
KW - High-pressure torsion
KW - Microstructure
KW - Stacking-fault energy
KW - Steel
KW - Twinning
UR - http://www.scopus.com/inward/record.url?scp=84896974703&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2014.03.029
DO - 10.1016/j.msea.2014.03.029
M3 - Article
AN - SCOPUS:84896974703
VL - 604
SP - 166
EP - 175
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -