Strain Induced Inward Grain Growth during Recrystallisation in Steel Sheets with BCC Crystal Structure

2012 ◽  
Vol 715-716 ◽  
pp. 303-308
Author(s):  
Jai Gautam ◽  
Roumen H. Petrov ◽  
Elke Leunis ◽  
Leo Kestens
Keyword(s):  
Surface Texture ◽  
Boundary Migration ◽  
Annealing Treatment ◽  
Random Surface ◽  
Surface Textures ◽  
Steel Sheets ◽  
Α Phase ◽  
Migration Mechanism ◽  
Different Types ◽  
Goss Orientation

The present paper investigates the potential application of Strain Induced Boundary Migration mechanism on the two different types of surface textures developed after α-γ-α phase transformation annealing, one with preferred cube and Goss orientation at the surface and the other with random surface texture without preferred orientations. It has been demonstrated that these surface texture components grow in across the thickness of the sheet after an appropriate combinations of a critical amount of rolling reductions and an annealing treatment at the recrystallisation temperature.

scholarly journals Microstructure and Texture Development in Thermomechanically Processed Leaded Brass

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 998
Author(s):  
Khaled J. Al-Fadhalah ◽  
Muhammad Aleem Rafeeq ◽  
Nicky Thomas
Keyword(s):  
Phase Transformation ◽  
Thermomechanical Processing ◽  
Boundary Migration ◽  
Cluster Formation ◽  
Zinc Content ◽  
Α Phase ◽  
High Zinc ◽  
Migration Mechanism ◽  
Microstructure Examination ◽  
Brass Alloys

Leaded brass alloys with high zinc content are classified as dual-phase (α-βʹ) brass alloys. For these alloys, α-βʹ phase transformation induced by thermomechanical processing (TMP) is expected to play a significant role not only in the formation of α and βʹ phases and uniformity of lead particles but also in the development of Σ3 boundaries and their variants in the α phase. To assess such impact, the current study has employed two TMP schemes, with each scheme consisting of four cycles of compression and annealing. Samples of the first scheme (TMP-1) were annealed at 670 °C to promote phase transformation from α to βʹ, as compared to the second scheme (TMP-2) samples annealed at 525 °C. Microstructure examination indicated that TMP-1 scheme fostered a remarkable growth in the area fraction of βʹ phase, accompanied by grain coarsening of α and βʹ phases. This resulted in the isolation of α grains and less interaction of Σ3 boundaries at trip junctions, and therefore, a reduction in the fraction of Σ3 boundaries occurred in the α phase. On the other hand, the TMP-2 scheme successfully enhanced cluster formation of α grains, enabling further generation of Σ3 boundaries via strain-induced boundary migration mechanism and ultimately leading to breakup of the random boundary network. In addition, the two schemes resulted in limited coarsening of lead particles. Most lead particles were located at the α-βʹ interfaces, which suppressed grain boundary migration via the particle-dragging effect. For both TMP schemes, the initial texture of tension fibers was largely preserved after four cycles for both α and βʹ phases. Nevertheless, the TMP-2 scheme produced texture randomization of the α phase due to increasing the fraction of Σ3 boundaries.

Influence of Microstructural Change on Damping Capacity of Mg-X%Li Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 1764-1768
Author(s):  
Joong Hwan Jun ◽  
Ki Duk Seong ◽  
Jeong Min Kim ◽  
Ki Tae Kim ◽  
Woon Jae Jung
Keyword(s):  
Single Phase ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Microstructural Change ◽  
Damping Capacity ◽  
Flexural Mode ◽  
X Ray ◽  
Α Phase ◽  
Hardness Tests ◽  
Li Content

The Effects of Li content and annealing treatment on microstructure and damping capacity for Mg-X%Li alloys have been investigated, based on experimental results from X-ray diffractometry (XRD), optical microscopy (OM), hardness tests and vibration damping tests in a flexural mode. The Mg-X%Li alloys containing Li of 3%, 8% and 13% consist of α (HCP) single phase, (α + β (BCC)) dual phases and β single phase, respectively. In as-rolled state, the damping capacity for Mg-Li alloys shows a similar level regardless of Li content. The annealing treatments at 200oC and 400οC give rise to an enhancement of damping capacity only for the Mg-3%Li and Mg-8%Li alloys containing α phase, and at the same annealing temperature, the Mg-3%Li alloy with fully α structure exhibits higher damping capacity. This result indicates that the damping capacity of Mg-Li alloys depends principally on α phase, and that the annealing treatment is necessary to improve its damping capacity.

Microstructure and Texture Evolution in a Cold-Rolled High Mn Steel with Microadditions of Ti and Nb

2013 ◽  
Vol 203-204 ◽  
pp. 71-76
Author(s):  
Sławomir Kołodziej ◽  
Joanna Kowalska ◽  
Wiktoria Ratuszek ◽  
Wojciech Ozgowicz ◽  
Krzysztof Chruściel
Keyword(s):  
Plastic Deformation ◽  
Texture Evolution ◽  
Hexagonal Structure ◽  
Cold Plastic Deformation ◽  
Α Phase ◽  
Ε Phase ◽  
Cold Rolled ◽  
Goss Orientation ◽  
Mn Steel ◽  
Microscopic Investigations

The aim of this work was the microstructure and texture analysis of a deformed via cold-rolling 24.5Mn-3.5Si-1.5Al-Ti-Nb TWIP/TRIP type steel. It was found, that during cold plastic deformation a phase transformation of austenite into martensite takes place. The transformation progress was confirmed by the microscopic investigations. The texture of austenite is characterized by a limited α1=||RD fibre and the γ=||ND fibre. The texture of austenite changed with increasing deformation rate. In the texture of deformed austenite the strongest orientation is the {110} Goss orientation, which belongs to the α=||ND orientation fibre. During cold plastic deformation γ→ε and γ→ε→α’ phase transformations as well as the deformation of γ, ε and α’ phases are taking place in the steel. The formed ε phase (hexagonal structure) also possesses a distinct texture.

scholarly journals Comparison of the Influences of Surface Texture and Boundary Slip on Tribological Performances

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Qiyin Lin ◽  
Baotong Li
Keyword(s):  
Surface Texture ◽  
Slip Velocity ◽  
Structure Parameters ◽  
Textured Surfaces ◽  
Slider Bearing ◽  
Boundary Slip ◽  
Surface Textures ◽  
Slip Surfaces ◽  
Texture Structure ◽  
The Relationship

Close attentions have been widely paid to the engineering textured and slip surfaces for improving bearing tribological performances. Comparison studies on the tribological characteristics of slip and textured surfaces are carried out in this work. The analysis results point out that the influences of surface texture and boundary slip on tribological performances of slider bearing are strongly similar. For the determinate surface textures, there is one and only value of slip velocity to make the tribological performances of textured and slip surfaces in agreement. The corresponding relation between the slip velocity and the texture structure parameters is also obtained, and the size of slip velocity is directly related to the texture geometry parameters including its position parameters. This study will help us to further understand the relationship between boundary slip and surface texture and also the slip phenomenon.

scholarly journals Effect of Surface Textures of Steel Sheets on the Crystal Orientation of Electrodeposited Zinc

2018 ◽  
Vol 104 (4) ◽  
pp. 227-234 ◽  
Author(s):  
Honami Kawano ◽  
Satoshi Oue ◽  
Takashi Futaba ◽  
Akinobu Kobayashi ◽  
Yasuto Goto ◽  
...  
Keyword(s):  
Crystal Orientation ◽  
Surface Textures ◽  
Steel Sheets ◽  
Effect Of Surface

scholarly journals Effect of Surface Textures of Steel Sheets on the Crystal Orientation of Electrodeposited Zinc

2018 ◽  
Vol 58 (11) ◽  
pp. 2117-2124 ◽  
Author(s):  
Honami Kawano ◽  
Satoshi Oue ◽  
Takashi Futaba ◽  
Akinobu Kobayashi ◽  
Yasuto Goto ◽  
...  
Keyword(s):  
Crystal Orientation ◽  
Surface Textures ◽  
Steel Sheets ◽  
Effect Of Surface

The Effect of Dislocations in Grains on Texture Formation in Strain Induced Boundary Migration

2007 ◽  
Vol 558-559 ◽  
pp. 271-276 ◽  
Author(s):  
Kenichi Murakami ◽  
T. Kubota ◽  
Fabienne Grégori ◽  
Brigitte Bacroix
Keyword(s):  
Electrical Steel ◽  
Boundary Migration ◽  
The Other ◽  
Temper Rolling ◽  
Texture Formation ◽  
Steel Sheets ◽  
Electrical Steel Sheets

In order to elucidate the predominance of Goss grains after SIBM in electrical steel sheets, Goss, D-Cube and {111}<112> grains after temper rolling of 5 and 9% reduction were observed by TEM. In 5% strain the amount of dislocations in Goss grains was the smallest of the three orientations. In 9% strain dislocations in Goss grains were distributed more heterogeneously than the other two types of grains. It is considered that {111}<112> grains have large amounts of dislocations owing to high Taylor factors and the differences of microstructures between Goss and D-Cube grains are due to orientation stabilities. Goss grains are speculated to be easy to recover and therefore they are predominant after SIBM.

scholarly journals The Development of Surface Roughness and Implications for Cellular Attachment in Biomedical Applications

2001 ◽  
Vol 705 ◽  
Author(s):  
Bruce Banks ◽  
Sharon Miller ◽  
Kim de Groh ◽  
Amy Chan ◽  
Mandeep Sahota
Keyword(s):  
Surface Roughness ◽  
Computational Modeling ◽  
Surface Texture ◽  
Atomic Oxygen ◽  
Treatment Time ◽  
Ion Beam ◽  
Cleveland Clinic ◽  
Surface Textures ◽  
Grit Blasting ◽  
Cellular Attachment

AbstractThe application of a microscopic surface texture produced by ion beam sputter texturing to the surfaces of polymer implants has been shown to result in significant increases in cellular attachment compared to smooth surface implants in animal studies. A collaborative program between NASA Glenn Research Center and the Cleveland Clinic Foundation has been established to evaluate the potential for improving osteoblast attachment to surfaces that have been microscopically roughened by atomic oxygen texturing. The range of surface textures that is feasible depends upon both the texturing process and the duration of treatment. To determine whether surface texture saturates or continues to increase with treatment duration, an effort was conducted to examine the development of surface textures produced by various physical and chemical erosion processes. Both experimental tests and computational modeling were performed to explore the growth of surface texture with treatment time. Surface texturing by means of abrasive grit blasting of glass, stainless steel and polymethylmethacrylate surfaces was examined to measure the growth in roughness with grit blasting duration by surface profilometry measurements. Laboratory tests and computational modeling was also conducted to examine the development of texture on Aclar® (chlorotrifluoroethylene) and Kapton® polyimide, respectively. For the atomic oxygen texturing tests of Aclar®, atomic force microscopy was used to measure the development of texture with atomic oxygen fluence. The results of all the testing and computational modeling support the premise that development of surface roughness obeys Poisson statistics. The results indicate that surface roughness does not saturate but increases as the square root of the treatment time.

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