scholarly journals Model Calculations of Recrystallization Texture Formation by Growth Selection

1992 ◽  
Vol 19 (3) ◽  
pp. 125-145 ◽  
Author(s):  
U. Köhler ◽  
E. Dahlem-Klein ◽  
H. Klein ◽  
H. J. Bunge
Keyword(s):  
Growth Rate ◽  
Orientation Relationship ◽  
Recrystallization Texture ◽  
Rotation Angle ◽  
Deformation Texture ◽  
Texture Formation ◽  
Model Calculations ◽  
Rate Law ◽  
Growth Selection

Model calculations of recrystallization texture formation are carried out on the basis of growth selection according to the 40∘〈111〉 orientation relationship. It is shown that the fastest growing “compromise” orientation depends very sensitively on the nature of the deformation texture components, their relative amount and their spread, as well as on the value of the rotation angle and the spread range of the growth rate law. On this basis the cube recrystallization texture as well as the brass recrystallization texture can be modelled without further assumptions. Also modifications of the recrystallization texture due to modifications of the starting deformation texture are sufficiently described by the model.

scholarly journals Model Calculations of the Recrystallization Texture Formatio in α-Iron

1995 ◽  
Vol 23 (2) ◽  
pp. 87-114 ◽  
Author(s):  
U. Köhler ◽  
H. J. Bunge
Keyword(s):  
Recrystallization Texture ◽  
Selection Process ◽  
Deformation Texture ◽  
Primary Recrystallization ◽  
Texture Formation ◽  
Oriented Growth ◽  
Model Calculations ◽  
Bcc Metals ◽  
Growth Selection ◽  
Essential Assumption

Model calculations of primary recrystallization textures in bcc metals were carried out on the basis of a model which considers oriented nucleation as well as oriented growth. The influence of the input parameters, as deformation texture, nucleation distribution and growth law were investigated systematically. It is shown that the inhomogeneity of the deformed microstructure has to be taken into account. With this essential assumption the main features of the recrystallization texture formation can be explained by a growth selection process according to a 27∘ <110> and 84∘ <110> orientation relationship.

Effect of Deformation Texture Component Composition on Cube Texture Formation during Primary Recrystallization in Ni-Based Alloys

2005 ◽  
Vol 495-497 ◽  
pp. 1213-1218 ◽  
Author(s):  
I.V. Gervasyeva ◽  
D.P. Rodionov ◽  
B.K. Sokolov ◽  
Yu.V. Khlebnikova
Keyword(s):  
Texture Component ◽  
Nickel Alloys ◽  
Recrystallization Texture ◽  
Cube Texture ◽  
Component Composition ◽  
Deformation Texture ◽  
Primary Recrystallization ◽  
Rolling Temperature ◽  
Alloying Elements ◽  
Texture Formation

Deformation and primary-recrystallization textures in nickel alloys with some metals (Nb, to 5.4%; W, to 7.4; Re, to 4.1%; Mo, to 9.3%; V, to 10.1%; Mn, to 22.1%; Al, to 12.0% and Cr, to 22.0%) has been studied depending on the content of alloying elements and the rolling temperature. The dependence of the type of recrystallization texture on the component composition of the deformation texture has been established.

A Study of Recrystallization Texture Formation in Cold Rolled Iron Sheets with X-Ray Diffraction Techniques

1970 ◽  
Vol 14 ◽  
pp. 214-230 ◽  
Author(s):  
M. Matsuo ◽  
S. Hayami ◽  
S. Nagashima
Keyword(s):  
Cold Rolling ◽  
Recrystallization Texture ◽  
High Energy ◽  
Orientation Dependence ◽  
Primary Recrystallization ◽  
Texture Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stable Orientation ◽  
Rotational Orientation

AbstractThe possibility that primary recrystallization textures are influenced by local inhomogeneities of deformation induced in the regions of grain boundaries has been confirmed by comparing the cold rolling and the annealing textures of polycrystalline pure irons which were different in the grain size prior to cold rolling. Analyses were made for the effects of deformation on crystals, namely storage of lattice strain and orientation spread, with application of X-ray diffraction techniques, in order to elucidate the role of in homogeneities of deformation on recrystallization texture formation. Apparent correspondence was found between the orientation dependence of stored strain energy and the textural change on recrystallization. This is a scribed to oriented nucleation in high energy blocks, in the case of originally large-grain material in which the effects of inhomogeneities of deformation are small. But discrepancies arise on this basis in originally small - grain material in which the effects of inhomogeneities of deformation are thought to be considerable. The discrepancy is inferred to arise as an effect of local inhomogeneities of deformation, from the change in the trend of rotational orientation spreads from, a stable orientation and the extent of development of potential nuclei of recrystallization at high energy blocks in the orientation spreads. The change is considered to give rise to the variation in amount of microstrain distribution, which is expressed in recovery characteristics of lattice strains and in the dependence of microstrains on the column length as analyzed by following the procedure of Warren-Averbach.

Orientation Relationship during Partial α-γ-Phase Transformation in Microalloyed Steels

2005 ◽  
Vol 495-497 ◽  
pp. 447-452 ◽  
Author(s):  
I. Lischewski ◽  
Günter Gottstein
Keyword(s):  
Phase Transformation ◽  
Orientation Relationship ◽  
Microalloyed Steel ◽  
Austenite Phase ◽  
Microalloyed Steels ◽  
Special Focus ◽  
Partial Phase ◽  
Growth Selection

The ferrite to austenite phase transformation in microalloyed steel was studied, with a special focus on the orientation relationship between prior ferrite and subsequent austenite. Also the role of growth selection and preferred nucleation was investigated in this context. Their effects were examined at partial phase transformation.

Effects of Driving Force and Boundary Migration Velocity on Formation of Recrystallization Texture in Cold Rolled Pure Aluminum Sheets

2013 ◽  
Vol 753 ◽  
pp. 257-262 ◽  
Author(s):  
Wei Min Mao ◽  
Ping Yang
Keyword(s):  
Grain Growth ◽  
Driving Force ◽  
Recrystallization Texture ◽  
Pure Aluminum ◽  
Solute Drag ◽  
Texture Formation ◽  
Oriented Growth ◽  
Aluminum Sheets ◽  
Zener Drag ◽  
Cold Rolled

The effects of net driving force for migration of high angle grain boundaries were emphasized beside many other factors which could influence the process of texture formation during recrystallization annealing of 95% cold rolled pure aluminum sheets. The net driving force consists basically of stored energy. However, it could be reduced by recovery, boundary drag, solute drag and Zener drag in different extents, in which only boundary drag is mis-orientation dependent. It was indicated that both oriented nucleation and oriented growth have obvious influence on recrystallization texture, and how far they influence the texture depends also on the level of net driving force when the grain growth starts during annealing. Oriented growth, which is induced by the differences in boundary drag of differently oriented grains, and the corresponding texture formation, could be observed easily when the recrystallization proceeds under relative higher solute drag and Zener drag in commercial purity aluminum. The oriented nucleation process prevails during recrystallization of sufficiently recovered high purity aluminum with very low solute drag and Zener drag, after which strong cube texture forms. In this case the oriented growth indicates limited effect. Both the oriented growth and oriented nucleation will fail if high purity deformation matrix without clear solute drag and Zener drag has not experienced an obvious recovery before recrystallization grain growth, since extremely high net driving force leads to very small critical nucleus size and multiplicity of growing grains, which results in randomization of recrystallization texture.

Effect of Temperature on Recrystallisation Texture and Microstructure for Non-Oriented Silicon Steel under Asymmetrically Rolling Process16

2011 ◽  
Vol 194-196 ◽  
pp. 1314-1318
Author(s):  
Zheng Gui Zhang ◽  
Yan Dong Liu ◽  
Fu Wang
Keyword(s):  
Grain Size ◽  
Texture Component ◽  
Recrystallization Texture ◽  
Deformation Texture ◽  
Silicon Steel ◽  
Effect Of Temperature ◽  
X Ray Diffraction ◽  
Texture Intensity ◽  
The Difference ◽  
Two Sides

The effect of temperature on the recrystallization texture and microstructure of non-oriented silicon steel under asymmetrically rolling condition was quantatively studied using X-ray diffraction technology. The results show that the texture component accumulates around {111}<112> when annealed at 800°C. Texture intensity is high and grain size is uniformly distributed between 50μm and 100μm with best magnetism. When annealed at 850°C and 900°C, texture component is scattered and the grain size is also bigger. However, for the annealing at 750°C, the texture component is similar to cold rolled process. The grain size is small and non-uniform, which is unfavorable to magnetism. The difference of forces along the fast and slow side of the roller results in different deformation texture and further affects the intensity of recrystallization texture along the two sides of the roller.

On the optimization of a dc arcjet diamond chemical vapor deposition reactor

1996 ◽  
Vol 11 (3) ◽  
pp. 694-702 ◽  
Author(s):  
S. W. Reeve ◽  
W. A. Weimer ◽  
D. S. Dandy
Keyword(s):  
Growth Rate ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Film Growth ◽  
Chemical Vapor ◽  
Diamond Growth ◽  
Methyl Radical ◽  
Chemical Kinetic Model ◽  
Model Calculations ◽  
Chemical Vapor Deposition Reactor

Based on results from chemical kinetic model calculations, a method to improve diamond film growth in a dc arcjet chemical vapor deposition reactor has been developed. Introducing the carbon source gas (CH4) into an Ar/H2 plasma in close proximity to the substrate produced diamond films exhibiting simultaneous improvements in quality and mass deposition rates. These improvements result from a reduced residence time of the methane in the plasma which inhibits the hydrocarbon chemistry in the gas from proceeding significantly beyond methyl radical production prior to encountering the substrate. Improvements in growth rate were modest, increasing by only a factor of two. Optical emission actinometry measurements indicate that the flux of atomic hydrogen across the stagnation layer to the substrate is mass diffusion limited. Since diamond growth depends upon the flux of atomic H to the substrate, these results suggest that under the conditions examined here, a low atomic H flux to the substrate poses an upper limit on the attainable diamond growth rate.

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