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Title: Deformation of single crystal Hadfield steel by twinning and slip

Abstract

The stress-strain behavior of Hadfield steel (Fe, 12.34 Mn, 1.03 C, in wt%) single crystals was studied for selected crystallographic orientations ([{bar 1}11 ], [001] and [{bar 1}23]) under tension and compression. The overall stress-strain response was strongly dependent on the crystallographic orientation and applied stress direction. Transmission electron microscopy and in situ optical microscopy demonstrated that twinning is the dominant deformation mechanism in [{bar 1}11] crystals subjected to tension, and [001] crystals subjected to compression at the onset of inelastic deformation. In the orientations that experience twinning, the activation of multiple twinning systems produces a higher strain-hardening coefficient than observed in typical f.c.c. alloys. Based on these experimental observations, a model is presented that predicts the orientation and stress direction effects on the critical stress for initiating twinning. The model incorporates the role of local pile-up stresses, stacking fault energy, the influence of the applied stress on the separation of partial dislocations, and the increase in the friction stress due to a high solute concentration. On the other hand, multiple slip was determined to be the dominant deformation mechanism in [{bar 1}11] crystals subjected to compression, and [001] crystals deformed under tension. Furthermore, the [{bar 1}23] crystals experience singlemore » slip in both tension and compression with planar type dislocations. Using electron back-scattered diffraction patterns, macroscopic shear bands (MSBs) were identified with a misorientation of 9 {degree} in the compressed [{bar 1}11] single crystals at strains as low as 1%.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. of Illinois, Urbana, IL (US)
OSTI Identifier:
20020584
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 6; Other Information: PBD: 3 Apr 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; DEFORMATION; STEELS; MONOCRYSTALS; TWINNING; SLIP; DISLOCATIONS; MICROSCOPY; MATHEMATICAL MODELS

Citation Formats

Karaman, I, Sehitoglu, H, Gall, K, Chumlyakov, Y I, and Maier, H J. Deformation of single crystal Hadfield steel by twinning and slip. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00383-3.
Karaman, I, Sehitoglu, H, Gall, K, Chumlyakov, Y I, & Maier, H J. Deformation of single crystal Hadfield steel by twinning and slip. United States. https://doi.org/10.1016/S1359-6454(99)00383-3
Karaman, I, Sehitoglu, H, Gall, K, Chumlyakov, Y I, and Maier, H J. 2000. "Deformation of single crystal Hadfield steel by twinning and slip". United States. https://doi.org/10.1016/S1359-6454(99)00383-3.
@article{osti_20020584,
title = {Deformation of single crystal Hadfield steel by twinning and slip},
author = {Karaman, I and Sehitoglu, H and Gall, K and Chumlyakov, Y I and Maier, H J},
abstractNote = {The stress-strain behavior of Hadfield steel (Fe, 12.34 Mn, 1.03 C, in wt%) single crystals was studied for selected crystallographic orientations ([{bar 1}11 ], [001] and [{bar 1}23]) under tension and compression. The overall stress-strain response was strongly dependent on the crystallographic orientation and applied stress direction. Transmission electron microscopy and in situ optical microscopy demonstrated that twinning is the dominant deformation mechanism in [{bar 1}11] crystals subjected to tension, and [001] crystals subjected to compression at the onset of inelastic deformation. In the orientations that experience twinning, the activation of multiple twinning systems produces a higher strain-hardening coefficient than observed in typical f.c.c. alloys. Based on these experimental observations, a model is presented that predicts the orientation and stress direction effects on the critical stress for initiating twinning. The model incorporates the role of local pile-up stresses, stacking fault energy, the influence of the applied stress on the separation of partial dislocations, and the increase in the friction stress due to a high solute concentration. On the other hand, multiple slip was determined to be the dominant deformation mechanism in [{bar 1}11] crystals subjected to compression, and [001] crystals deformed under tension. Furthermore, the [{bar 1}23] crystals experience single slip in both tension and compression with planar type dislocations. Using electron back-scattered diffraction patterns, macroscopic shear bands (MSBs) were identified with a misorientation of 9 {degree} in the compressed [{bar 1}11] single crystals at strains as low as 1%.},
doi = {10.1016/S1359-6454(99)00383-3},
url = {https://www.osti.gov/biblio/20020584}, journal = {Acta Materialia},
issn = {1359-6454},
number = 6,
volume = 48,
place = {United States},
year = {Mon Apr 03 00:00:00 EDT 2000},
month = {Mon Apr 03 00:00:00 EDT 2000}
}