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Linearly Constrained Direct-Sequence Spread-Spectrum Interference Rejection
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Rational medical decision making : a case-based approach
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RF Transistor Macromodeling with Substrate Effect in Power Amplifier Design
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경기 용인 강남공원 일대 버섯 종다양성 조사
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- 저자 : M. Wroński (검색결과 3 건)
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Effect of Rolling Asymmetry on Selected Properties of Grade 2 Titanium Sheet
M. Wroński,K. Wierzbanowski,M. Wróbel,S. Wroński,S. Wroński 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.5
Asymmetric rolling can be used in order to modify material properties and to reduce forces and torques applied during deformation. This geometry of deformation is relatively easy to implement on existing industrial rolling mills and it can provide large volumes of a material. The study of microstructure, crystallographic texture and residual stress in asymmetrically rolled titanium (grade 2) is presented in this work. The above characteristics were examined using the EBSD technique and X-ray diffraction. The rolling asymmetry was realized using two identical rolls, driven by independent motors, rotating with different angular velocities. It was found that asymmetric rolling leads to microstructure modification and refinement. At low deformations one observes a process of grain size decrease caused by the asymmetry of rolling process. In contrast, at the medium range of deformations the microstructure refinement consists mainly in subgrain formation and grain fragmentation. Another observation is that for low to intermediate rolling reductions (≤40%) the predominant mechanisms are slip and twinning, while for higher deformation (>40%) the main mechanism is slip. It was found that grain refinement effect, caused by the rolling asymmetry, persists also after recrystallization annealing. And finally, texture homogenization and reduction of residual stress were confirmed for asymmetrically rolled samples.
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Microstructure Characteristics of ECAP Processed 1050 Aluminum After Deformation and 5 Years Later
M. Wroński,K. Wierzbanowski,R. Malik,S. Wroński,D. Wojtas,A. Baczmański,J. Tarasiuk 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Modifcation of microstructure parameters of severely deformed 1050 aluminum after 5 years of recovery at ambient temperature was studied. The samples of 1050 aluminum were extruded using ECAP technique. The EBSD maps were recordedfor the initial material and for the deformed samples. Next, the latter samples were left at ambient temperature during 5 yearsand a full EBSD study of the material was repeated. It was found that all microstructure parameters and textures have changedafter this period. This is due to recovery and partial recrystallization, which took place in the samples during 5 years. Thepresented modifcations of material microstructure are important, e.g., in the aspect of long time service of mechanical partsproduced by severe plastic deformation techniques
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Microstructure, Texture and Mechanical Properties of Titanium Grade 2 Processed by ECAP (Route C)
M. Wroński,K. Wierzbanowski,D. Wojtas,E. Szyfner,R. Z. Valiev,J. Kawałko,K. Berent,K. Sztwiertnia 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
In the present work the properties of titanium grade 2 after ECAP processing with original route and regimes (route C, channelangle = 120°, deformation temperature 300 °C, number of passes up to 8) were examined. Texture development andmicrostructure parameters after ECAP processing and after recrystallization were determined using electron back scatterdiff raction and analysed. A signifi cant increase of the mechanical strength accompanied by some increase of ductility wasobserved in the deformed samples. The kernel average misorientation and average grain orientation spread were stronglyincreased after deformation, which confi rms the material refi nement and fragmentation. The proportion of low angle boundariesincreased after four ECAP passes, but after four consecutive passes high angle grain boundaries became predominant. Nodeformation twins were observed after four and eight ECAP passes. The material recrystallized after deformation retaineda fi ne grain microstructure. The textures of deformed and recrystallized samples were determined. It was found that textureafter 8 passes is more homogeneous that that after 4 passes, which partly explains higher ductility of this fi rst sample.
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