Direct Observations of Cube Nucleation from Intergranular Cube Segments in Cold Rolled Al-Mn

2012 ◽  
Vol 715-716 ◽  
pp. 354-359
Author(s):  
Adeline Albou ◽  
S. Raveendra ◽  
P. Karajagikar ◽  
Indradev Samajdar ◽  
Julian H. Driver ◽  
...  
Keyword(s):  
Local Deformation ◽  
Direct Observations ◽  
Deformation Substructure ◽  
Cold Rolled ◽  
Ebsd Technique

Two major types of Cube bands/segments have been observed in heavily (90%) cold rolled Al-0.1wt %Mn using the EBSD technique with a FEG SEM: i) intergranular transition bands as thin cube segments aligned along RD between S and Cu oriented grains and ii) as transgranular strain localized bands situated in some particular grains. Their evolution is studied by light annealing at 275°C and 300°C and EBSD observations of exactly the same areas to directly correlate local deformation substructure with recrystallization. Only the intergranular cube transition bands give rapid recrystallization nucleation to cube grains of dimension >10µm. In particular the fastest growing cube grains have a near 40°<111> relation with part of their surroundings.

Influence of Deformation Substructures on the Early Mechanisms of Recrystallization in Cold-Rolled Titanium and Zirconium

2005 ◽  
Vol 495-497 ◽  
pp. 711-718 ◽  
Author(s):  
N. Dewobroto ◽  
Nathalie Bozzolo ◽  
Francis Wagner
Keyword(s):  
Pure Titanium ◽  
Local Deformation ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Commercially Pure ◽  
Before And After ◽  
Nucleation Mechanisms ◽  
Grain Fragmentation ◽  
Cold Rolled ◽  
Short Times

The mechanisms governing the very first stage of static recrystallization in two hexagonal alloys (commercially pure titanium and low alloyed zirconium) are investigated in this paper. Initially fully recrystallized and equiaxed materials were cold-rolled to 80% thickness reduction and subsequently recrystallized at 500°C for short times. High resolution EBSD maps were acquired in a FEG-SEM before and after annealing in order to see where and how the new grains appear. Nonoriented nucleation mechanisms are involved in both materials, and there is a strong correlation between the local deformation substructures and the recrystallization kinetics. Recrystallization is extremely fast in the areas where the deformation cells are small and highly misoriented, i.e. in the areas which underwent severe grain fragmentation. Twinning plays an important role for that purpose in the studied titanium sheet.

Spatially Inhomogeneous Recrystallization in Ferritic Stainless Steels

2012 ◽  
Vol 715-716 ◽  
pp. 866-871 ◽  
Author(s):  
Guillaume Lefebvre ◽  
Sina Shahandeh ◽  
Chad W. Sinclair ◽  
Matthias Militzer ◽  
Jean Denis Mithieux ◽  
...  
Keyword(s):  
Static Recrystallization ◽  
Grain Shape ◽  
Deformation Texture ◽  
Local Deformation ◽  
Physical Explanation ◽  
Ferritic Stainless Steels ◽  
Spatially Inhomogeneous ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Made In

The kinetics of static recrystallization in cold rolled ferritic stainless steel sheet tends to slow drastically over the last 10-20% of recrystallization. This has its origins in both the microstructure (deformed grain shape, precipitates) and in the local deformation texture. In this work we have sought to provide a physical explanation for the slow last stages of recrystallization through a texture dependent JMAK model which is informed by the microstructure of the partially recrystallized microstructure. The geometrical assumptions made in developing this JMAK model have been compared to phase field simulations using experimental observations as the source of their starting configuration.

K-S Relationship Identification Technique by EBSD

2011 ◽  
Vol 465 ◽  
pp. 415-418 ◽  
Author(s):  
M.C. Marinelli ◽  
M.G. Moscato ◽  
Javier Signorelli ◽  
A. El Bartali ◽  
I. Alvarez-Armas
Keyword(s):  
Slip System ◽  
Grain Boundaries ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Electron Backscattered Diffraction ◽  
Identification Technique ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
Relationship Identification

This paper focuses on the identification of activated slip system in flat specimens of hot- and cold-rolled UNS S32750 DSS plates subjected to low-cycle fatigue, paying particular attention on the existence of the K-S relationship. Electron Backscattered Diffraction (EBSD) technique was used to determine the local crystallographic properties of both phases. Although 27182 couples of α/γ grains were analyzed, the crystallographic K-S relationships were rarely observed between them. As a conclusion, it was observed that microcracks were mostly nucleated at grain boundaries and rarely at the extrusions.

Study of the Early Stages of Recrystallization in a Cold Rolled ELC Steel Using FIB-EBSD Tomography

2007 ◽  
Vol 561-565 ◽  
pp. 2013-2016
Author(s):  
Wan Qiang Xu ◽  
Michael Ferry
Keyword(s):  
Carbon Steel ◽  
Growth Stage ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Stored Energy ◽  
Subsequent Growth ◽  
Free Zone ◽  
Complex Processes ◽  
Deformation Substructure ◽  
Cold Rolled

An extra low carbon steel was cold rolled to 85% reduction and annealed at 680 °C to generate a microstructure containing ~2 % recrystallized grains. A partly recrystallized volume was analyzed using 3-D FIB-EBSD tomography. The results show that nucleation and subsequent growth of recrystallizing grains is more complex processes than that revealed using 2-D metallographic techniques. In the present steel, it was found that subgrains were found to be the origin of nucleation and these grains exhibit an internal structure similar to the surrounding deformation substructure. However, a certain subgrain keeps expanding to a stage where some part or parts of the boundary reach(es) and consume(s) a high stored energy deformation zone(s) to form (a) local dislocation free zone(s) having an orientation similar to the subgrain. After this stage, the residual dislocations in the original subgrain are annihilated and nuclei enter a well-defined growth stage. The overall growth of recrystallization nuclei was found to be controlled by the variation in both the stored energy and orientation of the surrounding deformation substructure that results in heterogeneous growth by so-called orientation pinning.

Effects of Strain Rate in Cold-Rolled Pure Copper Produced by Different Rolling Processes

2011 ◽  
Vol 695 ◽  
pp. 307-311
Author(s):  
Kuk Hyun Song ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Effective Strain ◽  
Pure Copper ◽  
Refined Grains ◽  
Grain Boundary Character ◽  
Processed Material ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
Conventional Rolling ◽  
Electron Back Scattered Diffraction

To evaluate the microstructures and mechanical properties in cross-roll rolled pure copper, comparing with conventionally rolled materials, this work was carried out. Pure copper (99.99 mass%) sheets with thickness of 5 mm were cold rolled to 90% thickness reduction by cross-roll rolling (CRR) and subsequently annealed at 400 °C for 30 min. Also, to analyze the grain boundary character distributions (GBCDs), electron back-scattered diffraction (EBSD) technique was employed. As a result, the cold rolled and annealed materials consisted of significantly refined grains than that of the initial material (100 mm). Especially, the CRR processed material showed more refined grain size (6.5 mm) in average than that (9.8 mm) of conventional rolling (CR). These grain refinements directly affected an increase in mechanical properties. Therefore, the microstructural and mechanical properties development observed in both processes was systematically discussed in terms of the effective strain originated by the plastic deformation.

Characters of Coarse Grains Subdivisions in Rolled Polycrystalline Al

2007 ◽  
Vol 546-549 ◽  
pp. 1033-1036
Author(s):  
Qi Ping Hu ◽  
Yong Zhang ◽  
Yun Lai Deng
Keyword(s):  
High Purity ◽  
Electron Backscatter Diffraction ◽  
Coarse Grains ◽  
Electron Backscatter ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
The Individual ◽  
Individual Grains ◽  
Backscatter Diffraction

Deformation microstructures and micro-orientations of columnar grains with different orientations in a polycrystalline high purity Al cold-rolled up to 65% (thickness reduction) were investigated using electron backscatter diffraction (EBSD) technique. It was found that rotations were Inhomogeneous within the individual grains, the rotation angles of the parts close to the initial boundaries (BPs) were smaller than those remote from the boundaries (IPs), e.g. the deviation angles between the BPs and the IPs were 5-6° in the grains with <001>//RD orientation, leading to the rotation along the α-fiber, while the deviation angles were 5-12° in the grains with <121>//ND orientation rotating toward the β-fiber. These results demonstrated that the microstructures and local rotations of various parts within the rolled individual columnar grains were influenced by their initial orientations and boundaries.

Effects of Grain Boundaries in Columnar Grained Electrical Steels during Deformation and Recrystallization

2013 ◽  
Vol 753 ◽  
pp. 173-176
Author(s):  
Ping Yang ◽  
Yuan Yuan Shao ◽  
Ning Zhang ◽  
Ling Cheng ◽  
Wei Min Mao
Keyword(s):  
Grain Boundaries ◽  
Grain Orientation ◽  
Rolling Direction ◽  
Single Type ◽  
Electrical Steels ◽  
Grain Orientations ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
Hot Rolled

The crystallographic and topographic anisotropies of columnar grains can exert strong influence on the subsequently hot rolled, cold rolled and annealed microstructures, textures and properties. The single type tilting grain boundaries among columnar grains will behave differently depending on grain orientations, rolling direction and stress state due to hot rolling and thus affect in return the microstructure and texture to some extents. This work aims to reveal the effects of grain boundaries and their neighboring grain orientation gradients in three types of Fe-3Si in differently processed samples using EBSD technique.

Application of 3D EBSD Technique to Study Crystallographic Texture in Heavily Cold-Rolled and Recrystallized Modified 9Cr–1Mo Steel

2018 ◽  
Vol 72 (3) ◽  
pp. 663-672
Author(s):  
Pradyumna Kumar Parida ◽  
Arup Dasgupta ◽  
Durga Prasad ◽  
R. Mythili ◽  
Saroja Saibaba
Keyword(s):  
Crystallographic Texture ◽  
Cold Rolled ◽  
Ebsd Technique

Grain Refinement and Mechanical Properties Enhancement in Cross Roll Rolled Pure Copper

2012 ◽  
Vol 1372 ◽  
Author(s):  
Kuk Hyun Song ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Pure Copper ◽  
Normal Direction ◽  
Refined Grains ◽  
Grain Boundary Character ◽  
Processed Material ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
Conventional Rolling ◽  
Electron Back Scattered Diffraction

ABSTRACTTo evaluate the microstructures and mechanical properties in cross-roll rolled pure copper, comparing with conventionally rolled materials, this work was carried out. Pure copper (99.99 mass%) sheets with thickness of 5 mm were cold rolled to 90% thickness reduction by cross-roll rolling (CRR) and subsequently annealed at 400 °C for 30 min. Also, to analyze the grain boundary character distributions (GBCDs), electron back-scattered diffraction (EBSD) technique was employed. As a result, the cold rolled and annealed materials consisted of significantly refined grains than that of the initial material (100 μm). Especially, the CRR processed material showed more refined grain size (6.5 μm) in average than that (9.8 μm) of conventional rolling (CR). These grain refinements directly affected an increase in mechanical properties. Furthermore, the texture development in CRR processed material, in which <112> grains were densely distributed in the normal direction (ND), was more effective to enhance the yield strength.

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