Bending Ductility of Heavily Cold-Rolled Ni3Al Thin Foils

2002 ◽  
Vol 753 ◽  
Author(s):  
Satoru Kobayashi ◽  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Toshiyuki Hirano
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
Slip Systems ◽  
Dislocation Interaction ◽  
Fracture Elongation ◽  
Thin Foils ◽  
Slip Planes ◽  
Cold Rolled ◽  
Bending Mechanism ◽  
Slip Deformation

ABSTRACTOur recent studies revealed that heavily cold-rolled Ni3Al foils have a good bending ductility in spite of almost no elongation in tensile test. In this paper, bending characteristics of 95% cold-rolled foils around transverse and rolling directions (TD and RD, respectively) were examined to understand the bending mechanism. Fracture elongation on the tension surface shows a large bending anisotropy: 5 % for the TD bending, while less than 1% for the RD bending. The bending ductility is due to {111}<110> slip deformation. In the TD bending, slip occurs on the slip systems operated during cold rolling, and cracks initiate along the shear bands. In the RD bending, slip occurs on the other {111} planes besides the slip planes operated during cold rolling, and fracture occurs as a result of the dislocation interaction in the both planes.

Survival of Goss Grains during Cold Rolling of a Silicon Steel Single Crystal

2005 ◽  
Vol 495-497 ◽  
pp. 1061-1066 ◽  
Author(s):  
Dorothée Dorner ◽  
Ludger Lahn ◽  
Stefan Zaefferer
Keyword(s):  
Cold Rolling ◽  
Single Crystal ◽  
High Strain ◽  
Shear Bands ◽  
Rolling Process ◽  
Silicon Steel ◽  
Oriented Crystal ◽  
Cold Rolled ◽  
Goss Orientation ◽  
Crystal Volume

A silicon steel single crystal with initial Goss orientation, i.e. the {110}<001> orientation, was cold rolled up to 89 % thickness reduction. Most of the crystal volume rotates into the two symmetrical equivalent {111}<112> orientations. However, a weak Goss component is still present after high strain, although the Goss orientation is mechanically instable under plane strain loading. Two types of Goss-oriented crystal volumes are found in the highly deformed material. We suggest that their origin is different. The Goss-oriented regions that are observed within shear bands form during the cold rolling process. In contrast, those Goss-oriented crystal volumes that are found inside of microbands survive the cold rolling.

scholarly journals Effect of cold rolling and annealing temperature to the characteristics of α + β' phases in Cu-29.5Zn-2.5Al alloy produced by gravity casting

2020 ◽  
Vol 56 (1) ◽  
pp. 89-97
Author(s):  
I. Angela ◽  
I. Basori ◽  
B.T. Sofyan
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
X Ray Diffraction ◽  
Gravity Casting ◽  
X Ray ◽  
Low Temperature Annealing ◽  
Slip Bands ◽  
Cold Rolling And Annealing ◽  
Higher Temperature ◽  
Cold Rolled

Al-brass alloys (Cu29.5Zn2.5Al wt. %) were produced by gravity casting and homogenized at 800?C for 2 h, resulting in a binary phase morphology identified as cubic ? and martensitic ?? phases through X-ray diffraction (XRD). Samples were then subsequently cold rolled and annealed at 150, 300, 400, and 600?C for 30 minutes. Visible traces of slip, intersecting slip bands, and shear bands were observed in microstructure images of the samples after each progressive deformation stage. Deformation-induced martensites were present after 20 % cold rolling. Higher thickness reduction resulted in simultaneous strain hardening of the phases. Low temperature annealing slightly increased microhardness, of both ? and ??, due to the formation of precipitates. SEM-EDX analysis showed that no solute segregation was found in annealed samples. Annealing at higher temperature resulted in conventional softening. Recrystallized equiaxed ?? phase grains were visible after annealing at 600?C.

Study of Texture in 6016 Aluminum Alloy during Processing

2016 ◽  
Vol 877 ◽  
pp. 356-362
Author(s):  
Zhang Wen ◽  
Ying Ying Liu ◽  
Zhi Hong Jia ◽  
Pi Zhi Zhao ◽  
Zhi Qing Zhang ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
Deformation Texture ◽  
Continuous Annealing ◽  
Intermediate Annealing ◽  
X Ray Diffraction ◽  
6016 Aluminum Alloy ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Rolled Plates

The evolution of texture in AA6016 alloy during processing was systematically investigated. The hot-rolled 6016 plates were cold-rolled to 0.9mm through three different rolling processes. One was directly rolled to 0.9mm, the other two were rolled to 1.8mm and 2.3mm, respectively, followed by intermediate annealing at 360°C for 2h, and then rolled to 0.9mm. Finally, the three kinds of cold rolled plates were performed continuous annealing at 560oC. The textures and microstructures of each stage were characterized by the X-ray diffraction and electron back scattering diffraction (EBSD) techniques. The results show that the texture of hot-rolled sample is mainly composed of Brass, S and Copper; the relative amount and maximum density changed after 1st cold-rolling. After intermediate annealing, the Cube and Cube+ND20 texture replace the deformation texture and rise with the rolling reduction. Then the conducting of final cold rolling results in the decrease of Cube and Cube+ND20 component and increase of deformation texture. After the continuous annealing, R, Brass-R, Goss, Cube and Cube+ND20 components are observed. Particle stimulated nucleation (PSN) and nucleation at shear bands dominate the competition of recrystallization.

Microstructures and Tensile Properties of Cold-rolled Thin Foils of Binary Ni-Al γ/γ' Alloys

2002 ◽  
Vol 753 ◽  
Author(s):  
Dingqiang Li ◽  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Yozo Suga ◽  
Toshiyuki Hirano
Keyword(s):  
Room Temperature ◽  
Small Difference ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Two Phase ◽  
Band Formation ◽  
Fracture Elongation ◽  
Thin Foils ◽  
Cold Rolled ◽  
Very High

ABSTRACTThree single crystal plates of γ/γ' Ni-Al two-phase alloys with near cube, Goss and intermediate orientations between cube and Goss were cold-rolled to 300 μm-thick foils with 83% reduction. Tensile tests of the foils were performed at room temperature to study the effect of rolling microstructures and textures on the mechanical properties. The fracture strength of all the foils was very high, 1.4–1.7 GPa, having a small initial normal direction (ND) dependence and a small difference between rolling direction (RD) and transverse direction (TD). The foils fabricated from initial cube and intermediate orientations showed necking and a small fracture elongation when tensile-tested along RD, while the foil fabricated from initial Goss orientation did not show necking and fracture elongation. All the foils showed small fracture elongations due to shear band formation when tensile-tested along TD.

Effect of the Channel Angle of One-Pass ECAP Prior to Cold Rolling on the Microstructure and Texture of Metallic Sheets

2014 ◽  
Vol 783-786 ◽  
pp. 2591-2596
Author(s):  
Hiroyuki Miyamoto ◽  
Masashi Ueda ◽  
Hiroshi Fujiwara
Keyword(s):  
Cold Rolling ◽  
Shear Strain ◽  
Equal Channel Angular Pressing ◽  
Shear Bands ◽  
Channel Angle ◽  
Deformation Microstructure ◽  
Steel Sheets ◽  
Angular Pressing ◽  
Cold Rolled ◽  
Scale Shear

Equal-channel angular pressing (ECAP) was applied to 16mass%Cr steel sheets for one pass prior to cold rolling in order to improve formability and alleviate ridging of the sheets. Effect of channel angle of ECAP (90° and 120°) on the deformation microstructure and the subsequent recrystallization was focused. One-pass ECAP indeed modified the cold-rolled microstructures, texture and subsequent recrystallization as compared with that in cold rolling alone. In particular, grain-scale shear bands were introduced during ECAP in otherwise hard-to-recrystallize <001>//ND grains by ECAP, and they facilitated the recrystallization. However, the effect of reducing the channel angle from 120°to 90°on the recrystallization and the formability was limited in spite of higher shear strain imposed on the sheets.

Effects of Normalizing Annealing on the Recrystallization Texture of 4.2wt.%Si Non-Oriented Electrical Steel Thin Sheets

2012 ◽  
Vol 535-537 ◽  
pp. 615-619 ◽  
Author(s):  
Jinlong Liu ◽  
Yu Hui Sha ◽  
Yong Chuang Yao ◽  
Fang Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Recrystallization Texture ◽  
Electrical Steel ◽  
Shear Bands ◽  
Rolling Process ◽  
Thin Sheets ◽  
Conventional Procedure ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Normalizing Annealing

The 4.2wt.%Si non-oriented electrical steel thin sheets with the thickness of 0.30mm were produced by the conventional procedure including hot rolling, cold rolling and annealing. The recrystallization texture was analyzed with emphasis on the effect of normalizing annealing. The results show that the  fiber with peak at {111} is weaker and η fiber is stronger in the sheets with normalizing annealing than those without normalizing annealing, either under the cold rolled reduction of 77% or 86%. Effects of normalizing annealing on the recrystallization texture can be explained in terms of the characteristic of the shear bands formed during cold rolling process.

Microstructure and Texture Development in Ti-5Al-5Mo-5V-3Cr Alloy during Cold Rolling and Annealing

2013 ◽  
Vol 551 ◽  
pp. 210-216 ◽  
Author(s):  
Alireza Ghaderi ◽  
Peter D. Hodgson ◽  
Matthew R. Barnett
Keyword(s):  
Cold Rolling ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Shear Bands ◽  
Annealing Treatment ◽  
Β Phase ◽  
Three Samples ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Phase Sample

This study focuses on the microstructure and texture evolution of a Ti-5Al-5Mo-5V-3Cr alloy during cold rolling and annealing treatments. Three samples with different initial microstructures were cold rolled to a 40% reduction in thickness. The starting microstructure of one sample was single β phase while two other specimens were α+β phases with different α particle sizes, distributed in β grains. For all three samples, the average size of primary β grains was 150 µm. The cold rolled specimens were then annealed at 860 °C (10 °C above the β transus temperature) for 5 minutes followed by water quenching. Microstructure development during cold rolling and recrystallization was studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) technique. Microstructure investigations showed that massive amount of shear bands occurred during the cold rolling of the single β phase sample while only a few shear bands were observed in the α+β cold rolled microstructures. The cold rolled texture of the sample comprised of a single β phase contains a gamma fibre (//ND) and a partial alpha fibre (//RD). Annealing treatment decreased the intensity of the cold rolled texture in the single β phase sample. Also, it was found that the presence of α precipitates changes the common annealing texture observed in the single β phase specimen.

Ti-Based Bulk Metallic Glass with High Cold Workability at Room Temperature

2005 ◽  
Vol 475-479 ◽  
pp. 3431-3434 ◽  
Author(s):  
J.M. Park ◽  
J.S. Park ◽  
J.H. Kim ◽  
Myung Hyun Lee ◽  
Won Tae Kim ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Metallic Glass ◽  
Cold Rolling ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Shear Bands ◽  
Reduction Ratio ◽  
Large Plastic Strain ◽  
Cold Rolled ◽  
Cold Workability

The cold workability of Ti-based bulk metallic glasses (BMGs) have been investigated. Ti45Zr16Be20Cu10Ni9 BMG with a large compressive plastic strain of 4.7 % shows a high cold workability, i.e. total reduction ratio of 50 % by cold rolling at room temperature. The multiple shear bands formed during rolling are effective in enhancing the plasticity. The cold rolled Ti45Zr16Be20Cu10Ni9 BMG (reduction ratio: 30 %) exhibits a large plastic strain of ~14 %.

scholarly journals EBSD study of microstructure evolution of ferritic stainless steel during cold rolling and annealing

2018 ◽  
Vol 190 ◽  
pp. 11007
Author(s):  
Chi Zhang ◽  
Yijie Xu ◽  
Liwen Zhang ◽  
Yinlin Gu
Keyword(s):  
Cold Rolling ◽  
Microstructure Evolution ◽  
Shear Bands ◽  
Inhomogeneous Deformation ◽  
Rolled Sample ◽  
Ferritic Stainless Steels ◽  
High Deformation ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Ebsd Technique

The microstructure and texture of ferritic stainless steels (FSSs), formed during cold rolling and annealing processes, determine the mechanical properties of final sheet, especially the deep drawing formability. In this work, aNb, Ti stabilized17%Cr FSS was cold rolled with the reductions of 20%~70% and annealed for periods at 700°C. EBSD technique was used to characterize the microstructure evolution and inhomogeneous deformation strain distribution of the sheet during cold rolling. Partially annealed sheets were also analyzed to observe the nucleation and growth of recrystallized grains. Special attentions were paid on the crystal orientation of the deformed grains and recrystallzed grains. The results infer that in-grain shear band was formed in the cold rolled sample with the reduction higher than 30%, associated with the formation of high deformation strains. And the recrystallized grains prefer to form at some unique grain boundaries and in-grain shear bands. The orientations of recrystallized grains relates to the deformed grains.

scholarly journals Texture in Cold Rolled and Magnetically Aged Fe–Mo–Ni–C Alloys

1998 ◽  
Vol 31 (1-2) ◽  
pp. 97-107 ◽  
Author(s):  
H. F. G. Abreu ◽  
J. R. Teodósio ◽  
C. S. Da Costa Viana
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
Orientation Distribution ◽  
Carbon Steels ◽  
Distribution Functions ◽  
Rolling Reduction ◽  
Low Carbon ◽  
Cold Rolling Reduction ◽  
Texture Change ◽  
Cold Rolled

The texture change due to the increase of cold rolling reduction in Fe-Mo-Ni-C alloys is described. Orientation Distribution Functions (ODF) for samples cold rolled 80%, 90%, 97% and 99% are shown and discussed. Below 90% cold rolling reduction, the texture in these alloys is similar to that of cold rolled low carbon steels. Above 90% cold rolling reduction, a decrease in the component {001}〈110〉 is observed and the texture becomes weaker probably due to the development of shear bands. Magnetic age-annealing at 610°C for 1 h does not recrystallize completely these alloys. Samples cold rolled above 90% (97% and 99%) present an increase in the {001}〈110〉 component, this being responsible for a corresponding increase in the magnetic anisotropy of these alloys.

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