Texture change near grain boundaries and triple points in cold-rolled interstitial-free steel

2004 ◽  
Vol 386 (1-2) ◽  
pp. 244-253 ◽  
Author(s):  
M NAVE ◽  
M BARNETT
Keyword(s):  
Grain Boundaries ◽  
Interstitial Free ◽  
Texture Change ◽  
Interstitial Free Steel ◽  
Cold Rolled ◽  
Triple Points

Grain Refinement and Texture Change in Interstitial Free Steels after Severe Rolling and Ultra-Short Annealing

2004 ◽  
Vol 467-470 ◽  
pp. 287-292 ◽  
Author(s):  
Leo Kestens ◽  
Ana Carmen C. Reis ◽  
Wlodzimierz Kaluba ◽  
Yvan Houbaert
Keyword(s):  
Heating Rate ◽  
Grain Refinement ◽  
Rapid Heating ◽  
Annealing Treatment ◽  
Interstitial Free ◽  
Heating Rates ◽  
Texture Change ◽  
Interstitial Free Steel ◽  
Short Annealing ◽  
Textural Development

A Ti-stabilized interstitial free steel was highly cold deformed to a reduction of 95% and subsequently submitted to extremely short annealing cycles with heating rates varying between 300°C/s and 4500°C/s followed by water quench at various temperatures. The microstructural and textural development was studied through various consecutive stages: partially recrystallized, fully recrystallized and after α→γ→α transformation. It was found that irrespective of the heating rate the recrystallization has completely terminated before the onset of the ferrite to austenite phase transformation. In the fully recrystallized condition, ultra-rapid heating gave rise to substantially refined structures with an average ferrite grain size of 6µm. It was also observed that this grain refinement saturates with heating rates beyond 1000°C/s. With regard to the texture formation, the characteristic {111} deep drawing fibre of cold rolled IF steels was observed, irrespective of the heating rate, in an annealing treatment as short as 0.3s. After the forward and reverse α→γ transformation, the ensuing ferrite texture displayed a strong memory effect, as the {111} fibre was even more intense after the double transformation than before.

Effect of Cold-Rolling Reduction on Recrystallized Annealing Microstructure and Texture of Titanium Stabilized Interstitial Free Steel

2012 ◽  
Vol 581-582 ◽  
pp. 1010-1013
Author(s):  
Gong Ting Zhang ◽  
Zhi Wang Zheng ◽  
Min Li Wang
Keyword(s):  
Cold Rolling ◽  
Salt Bath ◽  
Rolling Reduction ◽  
Interstitial Free ◽  
Texture Measurement ◽  
Cold Rolling Reduction ◽  
Interstitial Free Steel ◽  
Cold Rolled ◽  
Evolution Of Microstructure ◽  
Annealing Microstructure

Cold rolling and salt bath annealing simulation were conducted to study the evolution of microstructure and textures of a commercially produced Titanium stabilized interstitial free steel by means of optical microscopy and X-ray texture measurement. The results show that all of the as cold-rolled specimens are completely recrystallized after annealing. As the cold-rolling reduction increases, the recystallized ferrite grains are refined, The intensities of the stable {114} and {223} components remain strong after recrystallization. The orientation intensity of the {111} and {111} also increases accordingly. As the cold-rolling reduction increases to 90%, the intensity of {111} tend to be higher than that of {111}.

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.

Effect of Micro-Alloying Elements of Ti, Nb and B on Recrystallization Behavior of Cold-Rolled Interstitial-Free Steel Sheets

2013 ◽  
Vol 753 ◽  
pp. 207-212 ◽  
Author(s):  
Xin Li Song ◽  
Kun Peng ◽  
Ze Xi Yuan ◽  
W.W. Zhu ◽  
J. Jia ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Fibrous Tissue ◽  
Alloying Elements ◽  
Recrystallization Temperature ◽  
Interstitial Free ◽  
If Steel ◽  
Recrystallization Behavior ◽  
Steel Sheets ◽  
Interstitial Free Steel ◽  
Cold Rolled

The effect of micro-alloying elements of niobium and boron and titanium on recrystallization behavior is researched after the cold rolled IF steels are annealed at high temperature. The results show that there is high density dislocation in the cold rolled steel and the microstructure is fibrous tissue. The recrystallization grains appear when the cold steel annealed at 655 °C and then the grains grow up with the annealing temperature increased to 840 °C. The recrystallization temperature and time of B-Ti-IF steel is lower than that of Nb-Ti-IF and Ti-IF steels. The recrystallization activation energy of Nb-Ti-IF steel is 181.7KJ/mol which is 56.6KJ/mol larger than that of B-Ti-IF steel.

Texture Evolution of IF-Steel Sheets Processed by Equal-Channel Angular Sheet Extrusion (ECASE)

2011 ◽  
Vol 702-703 ◽  
pp. 123-126
Author(s):  
Onur Saray ◽  
Gencaga Purcek ◽  
B. Mahato ◽  
Sandip Ghosh Chowdhury
Keyword(s):  
Grain Boundaries ◽  
Tensile Properties ◽  
Equal Channel Angular Extrusion ◽  
Texture Evolution ◽  
Dislocation Cell ◽  
Interstitial Free ◽  
If Steel ◽  
Steel Sheets ◽  
Interstitial Free Steel ◽  
Sheet Extrusion

Interstitial-Free steel (IF-steel) sheets were severe plastically deformed using a continuous equal-channel angular extrusion/pressing technique called “Equal-Channel Angular Sheet Extrusion (ECASE). After processing, texture development as well as microstructural alteration and tensile properties were investigated. The microstructural investigations revealed that the processed sheets exhibited a dislocation cell and/or subgrain structures with mostly low angle grain boundaries. It was also observed that the strength of the processed sheets increased substantially after ECASE processing in the expense of ductility. It was shown that the ECASE has moderate influence on the texture of IF-steel sheets through route A. Intially there was θ partial fiber which changes to {110}θ with straining.

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