Texture and microstructure evolution during tensile testing of TWIP steels with diverse stacking fault energy

2013 ◽  
Vol 26 (6) ◽  
pp. 713-720 ◽  
Author(s):  
Yanxin Wu ◽  
Di Tang ◽  
Haitao Jiang ◽  
Zhenli Mi ◽  
Haitao Jing
Keyword(s):  
Microstructure Evolution ◽  
Tensile Testing ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Twip Steels

Structural features and strength behavior of TRIP/TWIP steels

2020 ◽  
pp. 5-18
Author(s):  
D. V. Prosvirnin ◽  
◽  
M. S. Larionov ◽  
S. V. Pivovarchik ◽  
A. G. Kolmakov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Thermomechanical Processing ◽  
Maximum Load ◽  
Structural Features ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Structural And Functional Properties ◽  
Twip Steels ◽  
The Creation

A review of the literature data on the structural features of TRIP / TWIP steels, their relationship with mechanical properties and the relationship of strength parameters under static and cyclic loading was carried out. It is shown that the level of mechanical properties of such steels is determined by the chemical composition and processing technology (thermal and thermomechanical processing, hot and cold pressure treatment), aimed at achieving a favorable phase composition. At the atomic level, the most important factor is stacking fault energy, the level of which will be decisive in the formation of austenite twins and / or the formation of strain martensite. By selecting the chemical composition, it is possible to set the stacking fault energy corresponding to the necessary mechanical characteristics. In the case of cyclic loads, an important role is played by the strain rate and the maximum load during testing. So at high loading rates and a load approaching the yield strength under tension, the intensity of the twinning processes and the formation of martensite increases. It is shown that one of the relevant ways to further increase of the structural and functional properties of TRIP and TWIP steels is the creation of composite materials on their basis. At present, surface modification and coating, especially by ion-vacuum methods, can be considered the most promising direction for the creation of such composites.

Simulation of Microstructure Evolution on Copper, Aluminum and Alloy during ECAP

2013 ◽  
Vol 652-654 ◽  
pp. 1927-1931
Author(s):  
Ting Biao Guo ◽  
Jun Yuan Zhao ◽  
Yu Tian Ding ◽  
Hai Long Li ◽  
Bo Liu
Keyword(s):  
Microstructure Evolution ◽  
Stacking Fault ◽  
Simulation Software ◽  
Stacking Fault Energy ◽  
Obvious Effect ◽  
Element Simulation ◽  
Metal Aluminum ◽  
Deformation Speed ◽  
Copper Aluminum ◽  
Deform 3D

The microstructure evolution of different stacking fault energy metal materials, copper, aluminum alloy and magnesium alloy during ECAP, were investigated based on the finite element simulation software DEFORM-3D. Analyzed the effect on the microstructure of deformation speed, extrusion passes and stacking fault energy. The results show that, the grain size is decreased with the pass number increasing, and deformation speed has no obvious effect on the microstructure. The high SFE metal, aluminum, shows a finer grains than the medium SFE metal, copper.

Strain Path Change Effect on Deformation Behaviour of Materials with Low-to-Moderate Stacking Fault Energy

2008 ◽  
Vol 587-588 ◽  
pp. 420-424 ◽  
Author(s):  
Nataliya A. Sakharova ◽  
Milena M. Vieira ◽  
José Valdemar Fernandes ◽  
Manuel F. Vieira
Keyword(s):  
Shear Modulus ◽  
Microstructure Evolution ◽  
Deformation Behaviour ◽  
True Strain ◽  
Stacking Fault ◽  
Metals And Alloys ◽  
Stacking Fault Energy ◽  
Dislocation Slip ◽  
Strain Paths ◽  
Complex Strain

Stacking fault energy (SFE) plays an important role in face centred cubic (f.c.c.) metals and alloys in determining the prevailing mechanisms of plastic deformation. Low SFE metals and alloys have a tendency to develop mechanical twinning, besides dislocation slip, during plastic deformations. Deformation behaviour and microstructure evolution under simple and complex strain paths were studied in 70/30 brass, with small and intermediate grain sizes, which corresponds to a f.c.c. material with low SFE. Simple (rolling and tension) and complex (tension normal to previous rolling) strain paths were performed. The macroscopic deformation behaviour of materials studied is discussed in terms of equivalent true stress vs. equivalent true strain responses and strain hardening rates normalized by shear modulus (dσ/dε)/G as vs. (σ – σ0)/G (σ0 is the initial yield stress of the material and G is the shear modulus). The mechanical behaviour is discussed with respect to dislocation and twin microstructure evolution developed in both, simple and complex strain paths.

Strain path dependence of anisotropic microstructure evolution on low Stacking Fault Energy F138 steel

2017 ◽  
Vol 698 ◽  
pp. 1-11
Author(s):  
N.S. De Vincentis ◽  
M.C. Avalos ◽  
A. Kliauga ◽  
H-G. Brokmeier ◽  
R.E. Bolmaro
Keyword(s):  
Microstructure Evolution ◽  
Strain Path ◽  
Path Dependence ◽  
Stacking Fault ◽  
Stacking Fault Energy

The Correlation between Stacking Fault Energy and the Work Hardening Behaviour of High-Mn Twinning Induced Plasticity Steel Tested at Various Temperatures

2014 ◽  
Vol 922 ◽  
pp. 676-681 ◽  
Author(s):  
Vadim Shterner ◽  
Ilana B. Timokhina ◽  
Hossein Beladi
Keyword(s):  
Mechanical Properties ◽  
Work Hardening ◽  
Room Temperature ◽  
True Strain ◽  
Testing Machine ◽  
Mechanical Twinning ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Tensile Testing Machine ◽  
Twip Steels

High-Mn Twinning Induced Plasticity (TWIP) steels have superior mechanical properties, which make them promising materials in automotive industry to improve the passenger safety and the fuel consumption. The TWIP steels are characterized by high work hardening rates due to continuous mechanical twin formation during the deformation. Mechanical twinning is a unique deformation mode, which is highly governed by the stacking fault energy (SFE). The composition of steel alloy was Fe-18Mn-0.6C-1Al (wt.%) with SFE of about 25-30 mJ/m2at room temperature. The SFE ensures the mechanical twinning to be the main deformation mechanism at room temperature. The microstructure, mechanical properties, work hardening behaviour and SFE of the steel was studied at the temperature range of ambient≤T[°C]≤400°C. The mechanical properties were determined using Instron tensile testing machine with 30kN load cell and strain rate of 10-3s-1and the work hardening behaviour curves were generated using true stress and true strain data. The microstructure after deformation at different temperatures was examined using Zeiss Supra 55VP SEM. It was found that an increase in the deformation temperature raised the SFE resulting in the deterioration of the mechanical twinning that led to decrease not only in the strength but also in the total strain of the steel. A correlation between the temperature, the SFE, the mechanical twinning, the mechanical properties and the work hardening rate was also found.

scholarly journals Stacking-Fault Energy Measurements in Fe-Mn-Al-Si Austenitic TWIP Steels

2011 ◽  
Vol 17 (S2) ◽  
pp. 1888-1889 ◽  
Author(s):  
D Pierce ◽  
J Bentley ◽  
J Jimenez ◽  
J Wittig
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Twip Steels

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

On effects of non-systematic reflections on weak-beam images of partial dislocations

1991 ◽  
Vol 49 ◽  
pp. 688-689
Author(s):  
K. Z. Botros ◽  
S. S. Sheinin
Keyword(s):  
High Precision ◽  
Stacking Fault ◽  
Important Application ◽  
Stacking Fault Energy ◽  
Sharp Peak ◽  
Weak Beam ◽  
Partial Dislocations ◽  
Deviation Parameter ◽  
Beam Diffraction

The main features of weak beam images of dislocations were first described by Cockayne et al. using calculations of intensity profiles based on the kinematical and two beam dynamical theories. The feature of weak beam images which is of particular interest in this investigation is that intensity profiles exhibit a sharp peak located at a position very close to the position of the dislocation in the crystal. This property of weak beam images of dislocations has an important application in the determination of stacking fault energy of crystals. This can easily be done since the separation of the partial dislocations bounding a stacking fault ribbon can be measured with high precision, assuming of course that the weak beam relationship between the positions of the image and the dislocation is valid. In order to carry out measurements such as these in practice the specimen must be tilted to "good" weak beam diffraction conditions, which implies utilizing high values of the deviation parameter Sg.

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