The effect of strain path reversal on high-angle boundary formation by grain subdivision in a model austenitic steel

2011 ◽  
Vol 64 (3) ◽  
pp. 280-283 ◽  
Author(s):  
L. Sun ◽  
K. Muszka ◽  
B.P. Wynne ◽  
E.J. Palmiere
Keyword(s):  
Austenitic Steel ◽  
Strain Path ◽  
High Angle Boundary ◽  
High Angle ◽  
Boundary Formation

Micromechanism of slip propagation through a high angle boundary in alpha brass

1986 ◽  
Vol 20 (2) ◽  
pp. 253-258 ◽  
Author(s):  
T.A. Bamford ◽  
B. Hardiman ◽  
Z. Shen ◽  
W.A.T. Clark ◽  
R.H. Wagoner
Keyword(s):  
High Angle Boundary ◽  
High Angle ◽  
Alpha Brass

Microstructural Evolution in 36%Ni Austenitic Steel during the ARB Process

2006 ◽  
Vol 512 ◽  
pp. 73-78 ◽  
Author(s):  
Bo Long Li ◽  
Nobuhiro Tsuji ◽  
Yoritoshi Minamino
Keyword(s):  
Austenitic Steel ◽  
Ferritic Steel ◽  
Rolling Direction ◽  
Equivalent Strain ◽  
Crystallographic Analysis ◽  
Boundary Structure ◽  
High Angle ◽  
Roll Bonding ◽  
The Mean ◽  
Lamellar Boundary

A 36mass% Ni austenitic steel was deformed to equivalent strains of 0.8 to 4.8 by the accumulative roll-bonding (ARB) process at 500°C, with slight lubrication. We analyzed the microstructure and crystallographic analysis by employing the electron back-scatter pattern (EBSP) technique in a field emission gun (FEG) SEM. After several ARB cycles, ultrafine lamellar boundary structures elongated in the rolling direction (RD) formed uniformly in the material. Observations indicated that the mean spacing of high-angle lamellar boundaries determined from the EBSP results decreased exponentially as a function of equivalent strain. The fraction of high-angle boundaries (HABs) increased, thus the average misorientation of the boundaries increased with increasing strain. In the six-cycle ARB-processed specimen, the mean spacing of the uniform lamellar boundaries was 150 nm, the fraction of HABs was 75%, and the average misorientation was 32°. The ultrafine lamellar boundary structure in the 36%Ni austenitic steel was finer and straighter than in ferritic steel (IF steel) deformed under similar conditions, probably because recovery occurs more easily in ferritic steel than austenitic steel.

Texture Invariant Annealing in Severely Deformed Steel

2007 ◽  
Vol 558-559 ◽  
pp. 101-106 ◽  
Author(s):  
Kaneaki Tsuzaki ◽  
Andrey Belyakov ◽  
Fu Xing Yin
Keyword(s):  
Grain Size ◽  
Fiber Texture ◽  
Annealing Process ◽  
High Angle Boundary ◽  
The Other ◽  
Total Strain ◽  
High Angle ◽  
Bar Rolling ◽  
Recovery Processes ◽  
Continuous Recrystallization

This paper showed an example of the phenomena that a strong deformed texture does not change after the annealing process in steels. An Fe – 22%Cr – 3%Ni ferritic stainless steel was processed by bar rolling/swaging to a total strain of 4.4 at an ambient temperature, and its annealing behaviour was studied in a temperature range of 400 ~ 700oC. The deformed sample showed a grain size of 200nm, a fraction of high-angle boundary (HAB) of about 0.6, and a strong fiber texture of <110>{uvw}. This texture showed very little change after annealing which was characterised by the development of continuous recrystallization involving recovery processes and followed by a normal grain growth. On the other hand, by annealing a sample that was deformed to total strain of 2.0 containing rather fine grains (270nm) but without a large enough fraction of HAB (0.3), a discontinuous recrystallization took place, and its deformed texture changed considerably.

New Type of Ultra-Fine Grained Microstructure in Ti-6Al-4V Alloy for Enhancing Superplasticity

2012 ◽  
Vol 735 ◽  
pp. 322-326
Author(s):  
Hiroaki Matsumoto ◽  
Sang Hak Lee ◽  
Yoshiki Ono ◽  
Akihiko Chiba
Keyword(s):  
Heterogeneous Nucleation ◽  
High Angle Boundary ◽  
Hot Compression ◽  
High Angle ◽  
Fine Grained ◽  
Ultrafine Grained ◽  
New Type ◽  
High Fraction ◽  
Ultrafine Grained Microstructure

This work presents a formation of ultrafine-grained microstructure (d ~ 0.2 μm) with high fraction of high-angle boundary in industrial Ti–6Al–4V alloy produced by the hot compression of a sample with the acicular α′martensite starting microstructure . It is found that heterogeneous nucleation becomes dominant in the case of the α’ starting microstructure.α

Grain Characteristics of 1235 Aluminum Alloy during Rolling

2020 ◽  
Vol 846 ◽  
pp. 77-81
Author(s):  
Wen Duan Yan ◽  
Gao Sheng Fu ◽  
Xiu Min Zhou ◽  
Dong Dong Chen
Keyword(s):  
Aluminum Alloy ◽  
Hot Rolling ◽  
Lattice Distortion ◽  
High Angle Boundary ◽  
Recrystallization Annealing ◽  
High Angle ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Rolling Deformation

Grain characteristics of rolled 1235 aluminum alloy were studied by EBSD. The effects of hot rolling, cold rolling and rolling deformation on grain boundaries and grain size of the metal were studied as well. The content of high-angle boundaries was low by 16.48 % in 50 % hot-rolled 1235 aluminum alloy. The complete dynamic recrystallization occurred, and grains were coarse. During 90 % hot rolling, the low-angle boundaries turned into high-angle boundaries constantly. The content of high-angle boundaries was higher by 40.16 %. Coarse grains broke into fine grains, and grew into medium grains. In the 90 % cold-rolled alloy, the trace shape of high-angle boundary was irregular. The lattice distortion was large, providing the energy needed in recrystallization during recrystallization annealing.

Microstructure and Texture Evolution during Equal Channel Angular Extrusion of Pure Copper: Effect of Strain Rat

2011 ◽  
Vol 239-242 ◽  
pp. 472-476
Author(s):  
Guo Ping Zhang
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Texture Evolution ◽  
Pure Copper ◽  
High Angle Boundary ◽  
Deformation Structure ◽  
High Angle ◽  
Fine Grain ◽  
Transmission Electron ◽  
Electron Back Scattered Diffraction ◽  
Copper Effect

Effect of strain velocity on the refinement of severe plastic deformation structure of ECA pressed pure copper was studied using transmission electron microscope(TEM) and electron back-scattered diffraction (EBSD) analysis. Formation mechanism of unltra-fine grain with high angle boundary was discussed. It was found that exceedingly fast stain rate can significantly increase the fraction of high angle boundary, up to 76%, and make grain refine further, up to 0.23μm.

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