Development of Asymmetric Rolling for the Better Control over Structure and Mechanical Properties in IF Steel

2012 ◽  
Vol 706-709 ◽  
pp. 2788-2793 ◽  
Author(s):  
Dmitry Orlov ◽  
Rimma Lapovok ◽  
László S. Tóth ◽  
Ilana B. Timokhina ◽  
Peter D. Hodgson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Backscatter Diffraction ◽  
Tensile Tests ◽  
Experimental Investigations ◽  
If Steel ◽  
Asymmetric Rolling ◽  
Electron Backscatter ◽  
Strain Components ◽  
Backscatter Diffraction ◽  
Crystallographic Orientations

In the present study, the effects of kinematic and geometric asymmetries in rolling during multi-pass processing of IF steel are examined. The theoretical investigation by final element simulations and experimental investigations by means of electron-backscatter diffraction analysis and tensile tests suggest that asymmetric rolling increases the total imposed strain compared to symmetric rolling, and largely re-distributes the strain components due to additional shear. This enhances the intensity of grain refinement, strengthens and tilts crystallographic orientations, and increases mechanical strength. The effect is highest in the asymmetric rolling with differential roll diameters.

scholarly journals Analysis of Strain Partitioning in Intercritically Deformed Microstructures via Interrupted Tensile Tests

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 112
Author(s):  
Unai Mayo ◽  
Nerea Isasti ◽  
José M. Rodríguez-Ibabe ◽  
Pello Uranga
Keyword(s):  
Electron Backscatter Diffraction ◽  
Tensile Tests ◽  
Correlation Technique ◽  
Strain Partitioning ◽  
High Angle ◽  
Electron Backscatter ◽  
Different Types ◽  
Final Deformation ◽  
Micro Alloyed Steel ◽  
Backscatter Diffraction

Intercritically deformed steels present combinations of different types of ferrite, such as deformed ferrite (DF) and non-deformed ferrite (NDF) grains, which are transformed during the final deformation passes and final cooling step. Recently, a grain identification and correlation technique based on EBSD has been employed together with a discretization methodology, enabling a distinction to be drawn between different ferrite populations (NDF and DF grains). This paper presents a combination of interrupted tensile tests with crystallographic characterization performed by means of Electron Backscatter Diffraction (EBSD), by analyzing the evolution of an intercritically deformed micro-alloyed steel. In addition to this, and using the nanoindentation technique, both ferrite families were characterized micromechanically and the nanohardness was quantified for each population. NDF grains are softer than DF ones, which is related to the presence of a lower fraction of low-angle grain boundaries. The interrupted tensile tests show the different behavior of low- and high-angle grain boundary evolution as well as the strain partitioning in each ferrite family. NDF population accommodates most of the deformation at initial strain intervals, since strain reaches 10%. For higher strains, NDF and DF grains behave similarly to the strain applied.

Inferential statistics of electron backscatter diffraction data from within individual crystalline grains

2010 ◽  
Vol 43 (6) ◽  
pp. 1338-1355 ◽  
Author(s):  
Florian Bachmann ◽  
Ralf Hielscher ◽  
Peter E. Jupp ◽  
Wolfgang Pantleon ◽  
Helmut Schaeben ◽  
...  
Keyword(s):  
Electron Backscatter Diffraction ◽  
Orientation Distribution ◽  
Numerical Determination ◽  
Spatial Statistical Analysis ◽  
Spatial Reference ◽  
Electron Backscatter ◽  
The Mean ◽  
Backscatter Diffraction ◽  
Crystallographic Orientations

Highly concentrated distributed crystallographic orientation measurements within individual crystalline grains are analysed by means of ordinary statistics neglecting their spatial reference. Since crystallographic orientations are modelled as left cosets of a given subgroup of SO(3), the non-spatial statistical analysis adapts ideas borrowed from the Bingham quaternion distribution on {\bb S}^3. Special emphasis is put on the mathematical definition and the numerical determination of a `mean orientation' characterizing the crystallographic grain as well as on distinguishing several types of symmetry of the orientation distribution with respect to the mean orientation, like spherical, prolate or oblate symmetry. Applications to simulated as well as to experimental data are presented. All computations have been done with the free and open-source texture toolboxMTEX.

Effect of Al on the microstructure, corrosion behavior and mechanical properties of Mg-4Li

2020 ◽  
Vol 67 (1) ◽  
pp. 31-37
Author(s):  
Cheng Zhang ◽  
Liang Wu ◽  
Zilong Zhao ◽  
Guangsheng Huang ◽  
Bin Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Design Methodology ◽  
Electron Backscatter Diffraction ◽  
Tensile Tests ◽  
Content Type ◽  
Solid Solution Strengthening ◽  
Corrosion Behaviors ◽  
Solution Strengthening ◽  
Backscatter Diffraction

Purpose This paper aims to investigate microstructure, corrosion behavior and mechanical properties of Mg-4Li and Mg-4Li-3Al. Design/methodology/approach The microstructure was characterized by using scanning electron microscopy and electron backscatter diffraction. The corrosion behaviors were measured by hydrogen evolution and potentiodynamic polarization tests. The mechanical properties were evaluated by tensile tests. Findings The addition of Al results in the precipitation of some Mg-Al phase and Al3Li phase particles, and the formation of some fine recrystallized grains. Originality/value Mg-4Li-3Al showed a higher corrosion rate than that of Mg-4Li, attributed to the precipitate particles in Mg-4Li-3Al causing microgalvanic corrosion and the change of grain orientation. The addition of 3 Wt. per cent Al increased the tensile strength by solid solution strengthening, precipitation strengthening, refinement strengthening and texture strengthening, whilst the elongation decreased by almost half.

scholarly journals Texture and Microtexture of Pure (6N) and Commercially Pure Aluminum after Deformation by Extrusion with Forward-Backward Rotating Die (Kobo)

2016 ◽  
Vol 61 (1) ◽  
pp. 461-468 ◽  
Author(s):  
M. Bieda ◽  
S. Boczkal ◽  
P. Koprowski ◽  
K. Sztwiertnia ◽  
K. Pieła
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Electron Backscatter Diffraction ◽  
Pure Aluminum ◽  
Pure Aluminium ◽  
Commercially Pure ◽  
Transmission Electron ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Crystallographic Orientations

Pure aluminium (6N) and commercially pure aluminium (99.7) was deformed by KOBO method. Microstructure and texture of both materials after deformation was analyzed by means of scanning and transmission electron microscopy. Advanced methods of crystallographic orientations measurements like Electron Backscatter Diffraction - EBSD (SEM) and microdiffraction (TEM) was used. Grain size distribution and misorientation between grains in cross and longitudinal sections of the samples were analyzed. Differences in size and homogeneity of the grains were observed in both materials. Pure aluminium was characterized by larger grain size in both sections of extruded material. Whereas commercially pure aluminium reveals smaller grain size and more homogeneous and stable microstructure.

scholarly journals Effect of Incremental Shrinking Process on Mechanical Properties and Microstructure of Alloy through Electron Backscatter Diffraction Analysis

2021 ◽  
Vol 2083 (2) ◽  
pp. 022079
Author(s):  
Zhengwei Gu ◽  
Yusheng Li ◽  
Ziming Tang ◽  
Ge Yu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Backscatter Diffraction ◽  
Mechanical Tests ◽  
Mechanical Anisotropy ◽  
Forming Process ◽  
Ebsd Data ◽  
Electron Backscatter ◽  
Shrinking Process ◽  
Backscatter Diffraction

Abstract In recent years, the incremental shrinking process has been widely used in the forming process of aluminum alloy components for the railway vehicles. The effect of the incremental shrinking process on the performance and microstructure of 6082-T6 aluminum alloy was investigated through mechanical tests and electron backscatter diffraction (EBSD) analysis. The tensile test specimens prepared in different rolling orientations (0˚,45˚and 90˚) along the original and deformed sheets exhibited the mechanical anisotropy. After the incremental shrinking process, the average microhardness, tensile strength, and yield strength of this alloy were respectively increased by nearly 8.78%,2.26%,2.72%, while the Elongation was decreased by almost 31.67%. By analyzing the EBSD data, the strength of the material is increased by the incremental shrinking process and its mechanical anisotropy is improved, whereas its plasticity is greatly deteriorated.

Effect of Phosphorus on the Mechanical Properties and Microstructure of Interstitial Free Steel

2012 ◽  
Vol 217-219 ◽  
pp. 433-436
Author(s):  
Zhi Fen Wang ◽  
Rong Dong Han ◽  
Shun Bin Zhou ◽  
Hai E Huang ◽  
Li Xin Wu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Electron Backscatter Diffraction ◽  
Recrystallization Process ◽  
Interstitial Free ◽  
If Steel ◽  
P Content ◽  
Average Grain Size ◽  
R Value ◽  
Backscatter Diffraction

Effect of phosphorus content on the mechanical properties and microstructure of IF steel sheets was investigated. Average grain size and recrystallization texture were measured by electron backscatter diffraction (EBSD). The results showed that the higher P resulted in higher tensile strength and lowered the elongation and r-value. The average grain size increased with decreasing P content. The //ND (γ-fiber) pole intensity had a lowest value for IF steel with the highest P content which in turn deteriorate r-value. The element P played an important role in recrystallization process which affected the mechanical properties and microstructure of IF steels.

Nanoindentation and Microstructural Study of Cu-Co Alloys after Severe Plastic Deformation

2013 ◽  
Vol 592-593 ◽  
pp. 720-723 ◽  
Author(s):  
Jiří Buršík ◽  
Petr Král ◽  
Milan Svoboda ◽  
Jiří Dvořák ◽  
Václav Sklenička
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Room Temperature ◽  
Electron Backscatter Diffraction ◽  
Microstructural Study ◽  
Angular Pressing ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Co Alloys ◽  
Scanning Electron

In this work we studied the microstructure evolution due to equal channel angular pressing of Cu-2wt.%Co alloy after various heat treatments. Several subsequent passes were performed at room temperature. The microstructure was characterized using electron backscatter diffraction technique in a scanning electron microscope. Local mechanical properties were studied by means of nanoindentation experiments using a Hysitron PI85 picoindenter operated inside an electron microscope.

scholarly journals Microstructure and Texture Evolution with Relation to Mechanical Properties of Compared Symmetrically and Asymmetrically Cold Rolled Aluminum Alloy

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 156 ◽  
Author(s):  
Jakob Kraner ◽  
Peter Fajfar ◽  
Heinz Palkowski ◽  
Goran Kugler ◽  
Matjaž Godec ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Strain Ratio ◽  
Tensile Tests ◽  
Asymmetric Rolling ◽  
Plastic Strain Ratio ◽  
Rolled Aluminum ◽  
The Impact

The impact of asymmetric cold rolling was quantitatively assessed for an industrial aluminum alloy AA 5454. The asymmetric rolling resulted in lower rolling forces and higher strains compared to conventional symmetric rolling. In order to demonstrate the positive effect on the mechanical properties with asymmetric rolling, tensile tests, plastic-strain-ratio tests and hardness measurements were conducted. The improvements to the microstructure and the texture were observed with a light and scanning electron microscope; the latter making use of electron-backscatter diffraction. The result of the asymmetric rolling was a much lower planar anisotropy and a more homogeneous metal sheet with finer grains after annealing to the soft condition. The increased isotropy of the deformed and annealed aluminum sheet is a product of the texture heterogeneity and reduced volume fractions of separate texture components.

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