Characterisation of crystallographic texture of hot rolled low carbon microalloyed steels by Electron BackScatter Diffraction (EBSD)

2007 ◽  
Vol 104 (2) ◽  
pp. 98-105 ◽  
Author(s):  
C. Mapelli ◽  
R. Venturini ◽  
R. Riva
Keyword(s):  
Crystallographic Texture ◽  
Electron Backscatter Diffraction ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Electron Backscatter ◽  
Carbon Microalloyed ◽  
Hot Rolled ◽  
Backscatter Diffraction

Effect of Nb and V in the Development of Texture and Plastic Strain Ratio in Low Carbon Microalloyed Steels Produced by A.S.T. Technology

2005 ◽  
Vol 500-501 ◽  
pp. 279-286
Author(s):  
Carlo Mapelli ◽  
Roberto Venturini ◽  
Antonio Guindani
Keyword(s):  
Mechanical Properties ◽  
Strain Ratio ◽  
Tensile Tests ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Plastic Strain Ratio ◽  
Steel Technology ◽  
Back Scattering ◽  
Carbon Microalloyed ◽  
Hot Rolled

The effects of Nb and V on the anisotropy and textures featuring the hot rolled low carbon microalloyed steels produced by A.S.T. (Arvedi Steel Technology) have been studied as a function of the final coiling temperatute Tcoiling. Mechanical properties and r-values for twelve steels have been determined through tensile tests performed on three main different directions: 0°, 45°, 90° to the rolling one. The samples have been analysed by EBSD (Electron Back Scattering Diffraction) to identify the textures developed during the process. The relations among the chemical composition of the steels (i.e. C, N, Nb, V contents), the mechanical properties, the temperature during the coiling operations, the textures and the formability properties have been pointed out.

Formation of Nanoporous Gold Studied by Transmission Electron Backscatter Diffraction

2015 ◽  
Vol 21 (6) ◽  
pp. 1387-1397 ◽  
Author(s):  
Leo T.H. de Jeer ◽  
Diego Ribas Gomes ◽  
Jorrit E. Nijholt ◽  
Rik van Bremen ◽  
Václav Ocelík ◽  
...  
Keyword(s):  
Crystallographic Texture ◽  
Manufacturing Process ◽  
Electron Backscatter Diffraction ◽  
Nanoporous Materials ◽  
Nanoporous Gold ◽  
Grain Structure ◽  
Misorientation Distribution ◽  
Transmission Electron ◽  
Electron Backscatter ◽  
Backscatter Diffraction

AbstractTransmission electron backscatter diffraction (t-EBSD) was used to investigate the effect of dealloying on the microstructure of 140-nm thin gold foils. Statistical and local comparisons of the microstructure between the nonetched and nanoporous gold foils were made. Analyses of crystallographic texture, misorientation distribution, and grain structure clearly prove that during the dealloying manufacturing process of nanoporous materials the crystallographic texture is enhanced significantly with a clear decrease of internal strain, whereas maintaining the grain structure.

An Overview of the Effect of Nb in Strengthening Castrip® Steel

2013 ◽  
Vol 753 ◽  
pp. 559-562 ◽  
Author(s):  
Sachin L. Shrestha ◽  
Chen Zhu ◽  
Gwénaëlle Proust ◽  
Frank Barbaro ◽  
Chris R. Killmore ◽  
...  
Keyword(s):  
Electron Backscatter Diffraction ◽  
Atom Probe ◽  
Mechanical Processing ◽  
Hardness Tests ◽  
Electron Backscatter ◽  
Austenite Recrystallization ◽  
Strong Cluster ◽  
Hot Rolled ◽  
Backscatter Diffraction ◽  
Nb Addition

Here we review research in which Vickers hardness tests, optical microscopy, electron backscatter diffraction, and atom probe tomography were used to understand the strengthening effects that can be found with Nb in CASTRIP® steels during thermo-mechanical processing and ageing. Nb addition favours the grain refinement of ferrite by inhibiting the austenite recrystallization when hot rolled and provides a strong cluster-hardening effect during ageing.

Microstructure–Property Relationship in 22mm Thick X80 Coil Skelp

2010 ◽  
Author(s):  
M. Liebeherr ◽  
N. Bernier ◽  
D. Le`bre ◽  
N. Ilic´ ◽  
D. Quidort
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Electron Backscatter Diffraction ◽  
Bainitic Ferrite ◽  
Hot Strip Mill ◽  
Low Carbon ◽  
Welded Pipe ◽  
Hot Rolled ◽  
Backscatter Diffraction ◽  
The Impact

The progress in the development of heavy gauge X80 linepipe steel on coil at ArcelorMittal was recently rewarded with a 6000 ton commercial order for the production of 21.6mm wall thickness spiral welded pipe. The further product development is concentrating on the improvement of the impact toughness at low temperatures. Research is currently focussing on the relationship between the mechanical properties and the microstructure of the steels. In the present study, two industrially hot rolled X80 steels with thickness 21.6mm were investigated. The steels had the same chemical composition but were processed with different parameter sets in the hot strip mill. The two resulting low-carbon bainitic microstructures were composed predominantly of quasi-polygonal ferrite and globular bainitic ferrite / bainitic ferrite, respectively. Emphasis of the microstructure and property characterisation was laid on through-thickness gradients of grain size, hardness, texture, impact toughness and tensile properties. Accordingly, the materials were characterised at different positions in the thickness. Grain size and texture were determined by means of Electron Backscatter Diffraction (EBSD). Sub-size Charpy as well as sub-thickness tensile test specimens were taken at different positions in the cross section. The results show that the link between microstructure and properties is not at all obvious. The influence of mean grain size, grain size distribution and texture is discussed in detail.

Crystallographic Relationships between FCC and BCC Crystals: A Study Using EBSD Techniques

2005 ◽  
Vol 105 ◽  
pp. 121-126 ◽  
Author(s):  
You Liang He ◽  
Stéphane Godet ◽  
Pascal J. Jacques ◽  
John J. Jonas
Keyword(s):  
Electron Backscatter Diffraction ◽  
Continuous Distribution ◽  
Variant Selection ◽  
Orientation Relationships ◽  
Equilibrium Conditions ◽  
Electron Backscatter ◽  
Iron Nickel ◽  
The Subject ◽  
Hot Rolled ◽  
Backscatter Diffraction

The mechanisms governing the formation of transformation textures during the austenite-to-ferrite transformation are the subject of major debate. In this study, two extreme cases were examined: those of undeformed and deformed austenite. The first involves the transformation of austenite into Widmanstätten ferrite under "equilibrium" conditions in the Gibeon iron-nickel meteorite. This meteorite passed through the transformation at the rate of a few degrees per million years. Such cooling rates cannot of course be reached under laboratory conditions. The second concerns the transformation of hot rolled austenite after a quench into the bainite temperature range. These two behaviors were investigated by means of optical microscopy and electron backscatter diffraction (EBSD) techniques. The orientations of both the parent and product phases were measured and the orientation relationships are represented in Rodrigues-Frank (R-F) space. From the orientation of a particular FCC crystal, the crystallographic orientations of the product BCC crystals can be predicted according to the Bain, Kurdjumov-Sachs (K-S) and Nishiyama- Wassermann (N-W) correspondence relationships. Comparison of the predicted and measured orientations reveals that the Bain rotation is never observed; the K-S and N-W relationships are both observed and there is a continuous distribution of orientations between the exact K-S and N-W positions. The formation of preferred orientations under non-equilibrium conditions is scrutinized. These results are compared to recent models accounting for variant selection.

Effects of Transformation Temperature on Variant Grouping of Bainitic Ferrite in Low Carbon Steel

2011 ◽  
Vol 172-174 ◽  
pp. 155-160
Author(s):  
Naoki Takayama ◽  
Goro Miyamoto ◽  
Tadashi Furuhara
Keyword(s):  
Transformation Temperature ◽  
Electron Backscatter Diffraction ◽  
Lath Martensite ◽  
Bainitic Ferrite ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Bainite Structure ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Effects of transformation temperature on variant grouping tendency of bainitic ferrite in a low carbon low alloy steel transformed isothermally are investigated by means of electron backscatter diffraction analysis. Baintic variants of Kurdjumov-Sachs (K-S) orientation relationship belonging to the same Bain correspondence tend to form adjacently in the bainite structure formed at 823K, while the K-S variants sharing the same close-packed plane parallel relation form adjacently in the bainite structure formed at 723K and lath martensite formed by quenching.

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