Development of Fine-Grained High-Mn Steelby Cold Rolling and Annealing

2016 ◽  
Vol 838-839 ◽  
pp. 434-439 ◽  
Author(s):  
Zhanna Yanushkevich ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev ◽  
Christian Haase ◽  
Dmitri A. Molodov
Keyword(s):  
Cold Rolling ◽  
Shear Banding ◽  
Mechanical Twinning ◽  
Rolling Reduction ◽  
Fine Grained ◽  
Noticeable Increase ◽  
Ultrafine Grained ◽  
Cold Rolling And Annealing ◽  
Ultrafine Grained Microstructure ◽  
Ultrafine Grained Steel

The regularities of static recrystallization in an Fe-0.3C-17Mn-1.5Al TWIP steel subjected to cold rolling and annealing were studied. The cold rolling led to noticeable increase in the dislocation density, extensive mechanical twinning and shear banding. The subsequent annealing resulted in the development of recovered or recrystallized microstructure depending on the rolling reduction and the annealing temperature. An increase in the rolling reduction promoted the recrystallization development, which led to ultrafine-grained microstructure with a grain size below 10 μm. The developed ultrafine-grained steel samples are characterized by beneficial mechanical properties.

Cold Rolling and Annealing Microstructures and Textures of Low Carbon Steels

2010 ◽  
Vol 654-656 ◽  
pp. 214-217
Author(s):  
Marwan Almojil ◽  
Pete S. Bate
Keyword(s):  
Cold Rolling ◽  
Volume Fraction ◽  
Hsla Steel ◽  
Nucleation Site ◽  
Carbon Steels ◽  
Rolling Reduction ◽  
Low Carbon ◽  
Electron Backscattered Diffraction ◽  
Cold Rolling And Annealing ◽  
Fine Pearlite

The development of crystallographic textures of IF and HSLA steels after 20, 50, 70 and 90% cold rolling reductions and subsequent recrystallisation have been investigated using Electron Backscattered Diffraction (EBSD). The HSLA steel was initially processed to give a volume fraction of about 0.2 of fine pearlite colonies, which acted as mechanically hard particles. Both cold rolling and recrystallisation textures are shown to be largely dependent on the rolling reduction for both steels. With increasing rolling reduction, the texture shows gradual intensification of α and γ fibre components. Although PSN was the dominant nucleation site in the HSLA steel during annealing, the α and γ fibres also exist in the recrystallisation textures, but with lower density.

Microstructure and Texture Optimization in Fe-Si Ferritic Steels

2010 ◽  
Vol 638-642 ◽  
pp. 2829-2834 ◽  
Author(s):  
Patricia Gobernado ◽  
Roumen H. Petrov ◽  
Daniel Ruiz ◽  
Elke Leunis ◽  
Leo Kestens
Keyword(s):  
Cold Rolling ◽  
Magnetic Moments ◽  
Rolling Reduction ◽  
Ferritic Steels ◽  
Rotating Machines ◽  
Easy Magnetization ◽  
Ferromagnetic Properties ◽  
Cold Rolling And Annealing ◽  
Magnetic Applications ◽  
Rolling Deformation

The ferromagnetic properties of ferritic steels are known to strongly depend on the direction of magnetization. The <100> are the axes of spontaneous magnetic moments and hence the directions of easy magnetization. Materials displaying a <100>//ND texture are ideal not only for transformer but also for rotating machines due to their isotropic magnetic character. In the present study the potential of severe plastic rolling deformation is investigated. The cold rolling and annealing microstructures and textures are identified with increasing rolling strains to a maximum vM equivalent of 8.0. It is shown that excessive rolling reduction is capable of producing non-conventional texture components with promising potential for magnetic applications.

scholarly journals Improvement of Pitting-Corrosion Resistance of Ultrafine-Grained 7475 Al Alloy by Aging

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 360
Author(s):  
Ewa Ura-Bińczyk
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Al Alloy ◽  
Subsequent Aging ◽  
Fine Grained ◽  
Transmission Electron ◽  
Pitting Corrosion Resistance ◽  
Ultrafine Grained ◽  
Ultrafine Grained Microstructure

The effect of aging on the resistance to pitting corrosion of ultrafine-grained 7475 aluminium (Al) alloy processed by hydrostatic extrusion (HE) is studied. Differences in the microstructure were investigated using secondary electron (SEM) and transmission electron microscopy (TEM). Corrosion tests were performed in 0.1 M NaCl, and characterization of corroded surface was performed. The results of this work show that the pitting susceptibility of ultra-fine grained 7475Al is related to the distribution of MgZn2 precipitates. After HE, the formation of An ultrafine-grained microstructure at the grain boundaries of ultrafine grains is observed, while subsequent aging results in the formation of MgZn2 precipitates in the grain interior. Grain refinement increases susceptibility to localized attack, while the subsequent aging improves the overall corrosion resistance and limits the propagation of corrosion attack.

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

Ni3Al Thin Foil by Cold Rolling

2000 ◽  
Vol 646 ◽  
Author(s):  
Toshiyuki Hirano ◽  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Yozo Suga
Keyword(s):  
Cold Rolling ◽  
Rolling Direction ◽  
Cell Formation ◽  
Thin Foil ◽  
Rolling Reduction ◽  
Directionally Solidified ◽  
Banded Structure ◽  
Fine Grained ◽  
Thin Foils ◽  
Columnar Grains

ABSTRACTThin foils of stoichiometric Ni3Al below 100 μm in thickness were successfully fabricated by cold rolling of the sheets which were sectioned from directionally solidified ingots. Maximum rolling reduction in thickness amounted to 96%, irrespective of the initial orientation or the existence of columnar grains in the starting sheets. The as-rolled foils were characterized in terms of microstructures, textures and dislocation structures. The deformation microstructures were of a dual banded structure composed of two different {110} textures in the case of <001> rolling direction, while a rather homogeneous structure with a single {110} texture resulted in the case of <112> rolling direction. TEM observation revealed homogenous dislocation structures in either case without cell formation, accompanied by very fine grained-regions at higher reduction.

scholarly journals Improving Mechanical Properties of 18%Mn TWIP Steels by Cold Rolling and Annealing

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 776 ◽  
Author(s):  
Vladimir Torganchuk ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Cold Rolling ◽  
Large Strain ◽  
Total Elongation ◽  
Fine Grained ◽  
Average Grain Size ◽  
Twip Steels ◽  
Cold Rolling And Annealing

The microstructures and mechanical properties of Fe-0.4C-18Mn and Fe-0.6C-18Mn steels subjected to large strain cold rolling followed by annealing were studied. Cold rolling with a total reduction of 86% resulted in substantial strengthening at expense of plasticity. The yield strength and the ultimate tensile strength of above 1400 MPa and 1600 MPa, respectively, were achieved in both steels, whereas total elongation decreased below 30%. Subsequent annealing at temperatures above 600 °C was accompanied with the development of recrystallization leading to fine-grained microstructures with an average grain size of about 1 μm in both steels. The fine-grained steels exhibited remarkable improved mechanical properties with a product of ultimate tensile strength by total elongation in the range of 50 to 70 GPa %. The fine-grained steel with relatively high carbon content of 0.6%C was characterized by ultimate tensile strength well above 1400 MPa that was remarkably higher than that of about 1200 MPa in the steel with 0.4%C.

Deformation Behaviour of Ultrafine Grained Steel Produced by Cold Rolling of Martensite

2009 ◽  
Vol 48 (3) ◽  
pp. 229-235 ◽  
Author(s):  
S. Malekjani ◽  
I.B. Timokhina ◽  
I. Sabirov ◽  
P.D. Hodgson
Keyword(s):  
Cold Rolling ◽  
Deformation Behaviour ◽  
Ultrafine Grained ◽  
Ultrafine Grained Steel

Study of Texture in Ultra Fine Grained Dual Phase Steel Sheets

2011 ◽  
Vol 702-703 ◽  
pp. 806-809
Author(s):  
Papa Rao Mondi ◽  
R. Madhavan ◽  
V. Subramanya Sarma ◽  
S. Sankaran
Keyword(s):  
Cold Rolling ◽  
Dual Phase Steel ◽  
Intercritical Annealing ◽  
Rolling Direction ◽  
Dual Phase ◽  
Fine Grained ◽  
Steel Sheets ◽  
Cold Rolling And Annealing ◽  
Nb Microalloyed Steel ◽  
Cold Rolled

Severe cold rolling and short intercritcal annealing is often used to produce ultra-fine grained ferrite and martensite dual phase steels. In this paper, microstructure and texture of Nb-microalloyed steel following cold rolling and short intercritical annealing is investigated. The results show that cold rolling and annealing resulted in ultra-fine grained dual phase steel consisted of polygonal ferrite in the range of ~1-2 μm in size. In cold rolled material, the texture components are γ fiber (//normal direction) and α fiber (//rolling direction). Partial recrystallization texture was observed following intercritical annealing.

Formation of Ferrite-Cementite Ultrafine Grained Microstructure by Warm Compression for SM490 Martensite Steel

2007 ◽  
Vol 558-559 ◽  
pp. 539-544
Author(s):  
J.H. Li ◽  
Ping Guang Xu ◽  
Yo Tomota ◽  
Yoshitaka Adachi
Keyword(s):  
Dynamic Recrystallization ◽  
Low Carbon Steel ◽  
Block Size ◽  
Low Carbon ◽  
Fine Grained ◽  
Orientation Imaging ◽  
Ultrafine Grained ◽  
Different Temperatures ◽  
Dynamic Recrystallization Behavior ◽  
Ultrafine Grained Microstructure

The low carbon steel, SM490 was austenized at different temperatures followed by quenching into water to obtain martensite microstructures with different grain sizes. Then specimens were heated up to 600°C followed by warm-compression at έ=1.7x10-3 s-1 (strain rate) to investigate the dynamic recrystallization behavior. The influence of pre-tempering before compression was also investigated. The microstructure observations were performed with FE-SEM and orientation imaging analysis with EBSD. It is confirmed that the dynamic recrystallization occurred in the tempered martensite as well as the as-quenched marteniste, resulting in fine grained ferrite microstructure with about 2μm. The dynamic recrystallization grain size is hardly dependent on the block size of initial martensite.

Sign in / Sign up

Export Citation Format

Share Document