Recrystallization Processing of Cold-Rolled Nickel

2004 ◽  
Vol 819 ◽  
Author(s):  
I. Baker ◽  
H. Chang ◽  
J. Li
Keyword(s):  
Grain Growth ◽  
Isothermal Annealing ◽  
Secondary Recrystallization ◽  
Cube Texture ◽  
Rolling Texture ◽  
Primary Recrystallization ◽  
The Other ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Initial Texture

AbstractWe have examined the effects of isothermal annealing, at a variety of temperatures, and directional annealing, under a range of conditions, on both primary recrystallization and secondary recrystallization in 90% cold-rolled 99.5% nickel of two different textures. The initial texture is shown to influence the rolling texture and, hence, the results of subsequent annealing. It was found that one alloy showed a cube texture after primary recrystallization, underwent abnormal grain growth upon annealing at high temperatures, and could be directionally (secondary) recrystallized to give large columnar grains. In contrast, the other alloy produce a weak cube texture after primary recrystallization, showed only normal grain growth upon annealing at higher temperatures, and could not be directionally annealed to produce columnar grains. The implications of these results are discussed for producing columnar grains.

Evolution of Cube Texture in Cu-45at.%Ni Alloy Substrates for YBCO Coated Conductors

2015 ◽  
Vol 778 ◽  
pp. 105-109
Author(s):  
Hui Tian ◽  
Yi Wang ◽  
Pan Wang ◽  
Ya Ru Liang ◽  
Lin Ma ◽  
...  
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Cube Texture ◽  
Rolling Texture ◽  
Coated Conductors ◽  
Recrystallization Process ◽  
Ni Alloy ◽  
Back Scattering ◽  
Cold Rolled ◽  
Ybco Coated Conductors

The cube texture evolution during annealing of the heavy cold-rolled Cu-45at.%Ni alloy tapes were investigated by XRD and electron back scattering diffraction techniques. The results indicated that the fraction of Copper-type rolling texture was slightly strengthened during recovery, and then strongly reduced during recrystallization. The cube texture was formed by consuming the rolling texture components during recrystallization process, and the S, Copper and Brass orientations were consumed together via cube grain growth. A strong cube-textured Cu-45at.%Ni alloy substrate with the cube texture fraction of 98.6 % (< 10°) was obtained after annealing at 1000 oC for 1 h.

Texture Evolution of a Cold-Rolled Fe-28Mn-0.28C TWIP Steel during Recrystallization

2013 ◽  
Vol 753 ◽  
pp. 213-216 ◽  
Author(s):  
Christian Haase ◽  
Luis Antonio Barrales-Mora ◽  
Dmitri A. Molodov ◽  
Günter Gottstein
Keyword(s):  
Isothermal Annealing ◽  
Twip Steel ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Primary Recrystallization ◽  
Rolled Material ◽  
Cold Rolled ◽  
Fiber Components

Texture evolution during static primary recrystallization of an austenitic Fe-28Mn-0.28C TWIP steel was analyzed. The cold-rolled material, which showed a Brass-type texture at medium (30% and 50%), and additionally a γ-fiber at high (80%) deformation degrees, was subjected to isothermal annealing at 700°C. The influence of rolling degree/starting texture on the development of particular texture components was studied. After recrystallization a weakened, retained rolling texture was observed for the examined reduction levels. In addition to the deformation components, Brass and Goss, further α-fiber components were formed mainly by annealing twinning leading to the development of this fiber.

Cu2S and AlN Precipitates in Fe-3%Si-0.5%Cu Steel Produced by Low Slab Reheating Technique

2013 ◽  
Vol 790 ◽  
pp. 69-72 ◽  
Author(s):  
Yang Wang ◽  
Yun Bo Xu ◽  
Yuan Xiang Zhang ◽  
Feng Fang ◽  
Xiang Lu ◽  
...  
Keyword(s):  
Grain Growth ◽  
Hot Rolling ◽  
Secondary Recrystallization ◽  
Primary Recrystallization ◽  
Silicon Steel ◽  
Recrystallization Annealing ◽  
Mean Size ◽  
The Mean

The grain oriented silicon steel containing 3%Si-0.5%Cu was produced by low slab reheating temperature technique. The precipitates were observed during the mainly process such as hot rolling, normalization, primary and secondary recrystallization annealing. The species, size, density and shape of precipitates were identified using TEM technique. The results indicate that Cu2S and AlN are mainly inhibitors which precipitate during hot rolling and normalization respectively. After primary recrystallization annealing the precipitation size of Cu2S is in the range of 30~40nm while the mean size of AlN is ~50nm, which could inhibit grain growth. In addition, the precipitation of MnS is inhibited comparing with the precipitation of Cu2S.

Oriented Nucleation and Selective Growth during Secondary Recrystallization in Ultra Low Carbon Steels

2004 ◽  
Vol 467-470 ◽  
pp. 941-948 ◽  
Author(s):  
Kim Verbeken ◽  
Leo Kestens
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Secondary Recrystallization ◽  
Low Carbon Steel ◽  
Primary Recrystallization ◽  
Carbon Steels ◽  
Abnormal Grain Growth ◽  
Selective Growth ◽  
Low Carbon ◽  
Ultra Low Carbon Steel

After primary recrystallization, on further annealing, abnormal grain growth occurred in ultra low carbon steel. Texture evolution was studied by comparing the orientations after complete secondary recrystallization, with on one hand the nuclei for abnormal grain growth and on the other hand the selective growth products of the primary recrystallized matrix. The influence of both mechanisms could be identified in the final texture.

Orientation Selection in ULC Steel during Thermally Activated Phenomena Induced by Cold Deformation

2007 ◽  
Vol 550 ◽  
pp. 491-496
Author(s):  
Kim Verbeken ◽  
Leo Kestens
Keyword(s):  
Cold Rolling ◽  
Cold Deformation ◽  
Secondary Recrystallization ◽  
Local Strain ◽  
Primary Recrystallization ◽  
Low Carbon ◽  
Orientation Selection ◽  
Thermally Activated ◽  
Open Questions ◽  
Cold Rolled

The scope of this work was to study the physical metallurgical behaviour of the microstructure and the texture of ultra low carbon (ULC) steel during cold rolling and subsequent thermally activated phenomena. It was the intention to contribute to the scientific search for the answer to many open questions raised in recent literature. The powerful tool of quantitative texture analysis, together with modern measurement equipment was used for this purpose. At first, a ULC steel was cold rolled to two different rolling reductions and the local strain heterogeneities after the cold rolling were studied. Secondly, crystallographic orientation selection during primary recrystallization was considered both for cold rolled ULC steel and for a Fe-2.8%Si single crystal. The latter was a re-evaluation of the historic growth selection experiment by Ibe and Lücke. Finally, secondary recrystallization in ULC steels was evaluated in terms of oriented nucleation and selective growth.

An Impingement – Spheroidisation Theory for Nucleation and Grain Growth

2004 ◽  
Vol 467-470 ◽  
pp. 45-50
Author(s):  
B.J. Duggan ◽  
Y.Y. Tse ◽  
G.J. Shen
Keyword(s):  
Aspect Ratio ◽  
Grain Growth ◽  
Ostwald Ripening ◽  
Cube Texture ◽  
Interstitial Free ◽  
Interstitial Free Steel ◽  
Hot Band ◽  
Cold Rolled ◽  
Grain Growth Kinetics ◽  
Equiaxed Grains

In an investigation of nucleation of recrystallisation in an Interstitial Free steel it was found that new crystals were almost always contained within the rolled-out hot band grain envelopes and were mostly equiaxed. At a later stage they grew and had an aspect ratio of 2:1 but at the completion of recrystallisation were again equiaxed. This is explained by the notion that nucleation occurs relatively frequently in certain grains, that these nuclei have very similar orientations and are thus orientation pinned within the solute and precipitate containing envelopes of the hot band grains. Provided the misorientation is small the impinged group are capable of spheroidisation provided the driving force across the pinned boundary is sufficient to overcome the pinning, because, by definition, this pinned boundary is of high angle character. The theory, as it is presented as coalescence, relies on a form of Östwald ripening and therefore provides a possible explanation of why grain growth kinetics obeys a time exponent of between 1/2 and 1/3. A similar observation of high aspect ratio grains has been made many times in the case of cold rolled copper which forms cube texture. Again, nuclei are formed in the cube bands, but these are prevented from lengthening because of orientation pinning. However, when the length of a group of such impinged nuclei is sufficient, spheroidisation will produce equiaxed grains.

scholarly journals Influence of Rolling Temperature on the Perfection Degree of Recrystallization Cube Texture in Nickel

2001 ◽  
Vol 35 (1) ◽  
pp. 1-22 ◽  
Author(s):  
B. K. Sokolov ◽  
I. V. Gervasyeva ◽  
D. P. Rodionov ◽  
Yu. V. Khlebnikova ◽  
I. N. Stepanova ◽  
...  
Keyword(s):  
Room Temperature ◽  
Secondary Recrystallization ◽  
Cube Texture ◽  
Deformation Texture ◽  
Primary Recrystallization ◽  
Pure Nickel ◽  
Rolling Temperature ◽  
Different Temperatures ◽  
Kinetics Of ◽  
Thin Tape

The effect of the rolling temperature on the deformation texture and the perfection degree of a cube texture in pure-nickel thin tape were investigated. The kinetics of primary recrystallization was studied on samples that had undergone rolling at different temperatures and the temperature of the onset of secondary recrystallization was determined. Regularities of the structure formation in the samples are discussed. It is established that the cube texture with the maximum sharpness is produced in the samples rolled at room temperature.

Recrystallization of Nickel and Ni Alloy Substrates for YBCO Coated Conductors

2000 ◽  
Vol 659 ◽  
Author(s):  
Rainer Nast ◽  
Bernhard Obst ◽  
Wilfried Goldacker ◽  
Wolfgang Schauer
Keyword(s):  
Grain Growth ◽  
Volume Fraction ◽  
Secondary Recrystallization ◽  
Cube Texture ◽  
High Volume ◽  
Coated Conductors ◽  
Recrystallization Temperature ◽  
Cube Orientation ◽  
Ni Alloy ◽  
Kinetics Of

ABSTRACTTo avoid grain boundary grooving and abnormal grain growth during recrystallization of nickel and Ni alloy substrate tapes, the commonly used high recrystallization temperatures must be lowered.The development of the cube orientation is a nucleation-growth process. So the kinetics of the cube recristallization is strongly temperature dependent, and there is a very marked effect of the stacking fault energy (SFE) of the specific alloy on the activation energy. Concurrently with measurements of the formation kinetics of the cube orientation, the recrystallization texture of Ni (+99,99 wt.%), NiCr10 wt.% and NiMn10 wt.% tapes in dependence on the deformation history, the annealing temperature and time was investigated. Profile rolling to a rectangular rod, without further high temperature annealing, leads to a worse cube texture compared to round swaged rods with an in-plane 200 peak splitting. The increase of the recrystallization temperature and time sharpens the texture due to grain growth, limited by the occurrence of secondary recrystallization when a sample specific temperature is exceeded.In binary Ni alloys the commonly used alloying elements reduce the SFE. This favors the formation of recrystallization twins {122}<212> obstructing the oriented coating. In Mn alloyed tapes this effect is strongly pronounced. The tapes show a good cube texture, but also a high volume fraction of twins due to the low SFE. To suppress the twin formation we investigated ternary Ni based alloys with respect to possibly increased SFE and report first results.

Recrystallization and Precipitation of β-Mg17Al12 Phase of the Cold-Rolled Mg-9Al-1Zn Alloy Strip during Isothermal Annealing

2014 ◽  
Vol 789 ◽  
pp. 336-343 ◽  
Author(s):  
Yan Bin Jiang ◽  
Zhi Hao Zhang ◽  
Lei Guan ◽  
Guo Yi Tang
Keyword(s):  
Grain Growth ◽  
Annealing Temperature ◽  
Isothermal Annealing ◽  
Competitive Behavior ◽  
Alloy Strip ◽  
High Deformation ◽  
Annealing Conditions ◽  
Mg17al12 Phase ◽  
Cold Rolled ◽  
Deformation Area

Effect of isothermal annealing on the microstructure evolution of the cold-rolled Mg-9Al-1Zn alloy strip was investigated. It is found that the competition between the precipitation of β-Mg17Al12 phase and recrystallization of α-Mg matrix occur under the conditions of various annealing temperature and time. At a low annealing temperature (523K), the β-Mg17Al12 particles precipitate preferentially at locally high deformation area and grow into the lamellar-cluster with an increase in the annealing time, retarding the recrystallization of α-Mg matrix. With raising the annealing temperature (573~623K), both the precipitation of β-Mg17Al12 particles and recrystallization of α-Mg matrix take place. Both recrystallization and grain growth are prone to proceed without precipitation of β-Mg17Al12 particles when the annealing temperature is 673K. A mechanism for the competitive behavior between the precipitation of β-Mg17Al12 phase and recrystallization of α-Mg matrix at various annealing conditions is discussed.

Texture Change during Grain Growth in Non-Oriented Electrical Steel

2013 ◽  
Vol 753 ◽  
pp. 329-332
Author(s):  
Yoshihiro Arita ◽  
Yoshiyuki Ushigami ◽  
Kenichi Murakami ◽  
Kohsaku Ushioda
Keyword(s):  
Grain Growth ◽  
Electrical Steel ◽  
Abnormal Grain Growth ◽  
Initial Structure ◽  
Rolled Steel ◽  
Ebsd Data ◽  
Texture Change ◽  
Average Grain Size ◽  
Cold Rolled ◽  
Initial Texture

Texture change during grain growth in Fe-3%Si non-oriented electrical steel was investigated. Cold rolled steel, 0.35mm in thickness, was annealed and recrystallized as an initial structure. Normal grain growth and abnormal grain growth occurred by additional annealing. {111} was dominant in the initial texture. However {100} component, which was not in majority in the initial structure, became stronger after normal grain growth. It was revealed that an average grain size of {100} in the initial structure was bigger than those of other components by analysis of the EBSD data,. Therefore, it is concluded that {100} strengthened after normal grain growth due to its size advantage. On the other hand, {111} components became more stronger after abnormal grain growth. It is inferred that another mechanism of the texture change worked in abnormal grain growth.

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