Numéro |
J. Phys. IV France
Volume 115, June 2004
|
|
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Page(s) | 223 - 230 | |
DOI | https://doi.org/10.1051/jp4:2004115027 |
J. Phys. IV France 115 (2004) 223
DOI: 10.1051/jp4:2004115027
Plastic deformation of nitrogen-containing austenitic stainless steel single crystals with low stacking fault energy
I.V. Kireeva1, N.V. Luzginova1, Yu.I. Chumlyakov1, I. Karaman2 and B.D. Lichter31 The Siberian Physical-Technical Institute, Tomsk, 1 Novosobornaya Sq 634050, Russia
2 Texas A and M University, Department of Mechanical Engineering, College Station, TX 77843-3123, USA
3 Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
Abstract
On single crystals of austenitic stainless steel with nitrogen
C
=0-0.5 wt.% the stages of stress-strain curves,
work-hardening coefficient, deformation mechanism - slip and
twinning, the developing of dislocation structure in dependence
on crystal tensile axis orientation, test temperature, nitrogen
concentration have been investigated. The type of dislocation
structure (cellular or planar) and deformation mechanism (slip
or twinning) have been shown to determine by the value of matrix
stacking fault energy, by the level of friction forces due to
solid solution hardening with nitrogen atoms and by the crystal
orientation. It has been established that the contribution of
mechanical twinning to the plastic deformation of steel crystal
increases with nitrogen content, and in high-strength states at
concentration of interstitial atoms C
0.5 wt.% mechanical
twinning develops from early stages of deformation and determines
work-hardening coefficient. The achievement of high level of
deformation stresses due to the solid solution hardening with
nitrogen atoms in combination with low values of
results
in twinning in [001] orientations.
© EDP Sciences 2004