Journal ArticleDOI
A Process of Notch Wavy Rolling for Strengthening Metal Sheets
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TLDR
In this paper, a sine wave shape (wave amplitude <2mm) was used for strengthening 1mm thin austenitic stainless steel coil sheet by cold rolling without further reduction in thickness.Abstract:
Wavy roll design was employed for strengthening 1 mm thin austenitic stainless steel coil sheet by cold rolling without further reduction in thickness. This steel possesses high corrosion resistance and high ductility. Initially, the sheets were rolled into sine wave shape (wave amplitude <2 mm) and then flattened using conventional cold rolling mill. Such a process cycle was repeated for four times successfully and the mechanical properties were measured after each cycle. The yield strength increased from 255 to 931 MPa with corresponding decrease in elongation from 45% to only 17% after the fourth cycle of severe cold working. Tensile strength and hardness values increased from 753 MPa and 185 HV to 973 MPa and 371 HV, respectively. The micro-to-nano-scale resolution structures, obtained by optical and atomic force microscope (AFM), were used to explain the variation in properties during this manufacturing process and to propose schematically the deformation mechanism.read more
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Cryorolling and warm forming of AA6061 aluminum alloy sheets
TL;DR: An alternative method to improve both strength and formability of cryorolled sheets by warm forming without any post-heat treatment is proposed in this paper, where the formability is characterized in terms of forming limit diagrams (FLDs) and limiting dome height (LDH).
Journal ArticleDOI
Microstructural Evolution and Strengthening of AM90 Magnesium Alloy Processed by ECAP
TL;DR: In this paper, equal channel angular pressing (ECAP) was applied on AM90 magnesium alloy using processing route at the expense of increased tensile strength, elongation and hardness.
Journal ArticleDOI
Influence of velocity of pressing in RCS processed AA8090 Al-Li alloy
TL;DR: In this paper, the effect of grain refinement in AA8090 Al-Li alloy sheets during repetitive corrugation and straightening (RCS) at 300°C was studied.
Journal ArticleDOI
Homogenization of 7050 plates by a novel differential temperature rolling
TL;DR: In this article, a novel differential temperature rolling method was adopted to overcome the challenge of inhomogeneity in thickness direction, which has hindered efforts to produce ultra-thick aluminum plates.
References
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Book
The theory of transformations in metals and alloys : an advanced textbook in physical metallurgy
Journal ArticleDOI
Extreme grain refinement by severe plastic deformation: A wealth of challenging science
Yuri Estrin,Alexei Vinogradov +1 more
TL;DR: A brief overview of the available SPD technologies is given in this paper, along with a summary of unusual mechanical, physical and other properties achievable by SPD processing, as well as the challenges this research is facing, some of them generic and some specific to the nanoSPD area.
Journal ArticleDOI
Severe Plastic Deformation (SPD) Processes for Metals
Akira Azushima,Reiner Kopp,Antti Korhonen,D.Y. Yang,Fabrizio Micari,G.D. Lahoti,Peter Groche,Jun Yanagimoto,Nobuhiro Tsuji,Andrzej Rosochowski,Akira Yanagida +10 more
TL;DR: In this paper, the authors defined severe plastic deformation (SPD) as metal forming processes in which a very large plastic strain is imposed on a bulk process in order to make an ultra-fine grained metal.
Journal ArticleDOI
Formation of Shear Bands and Strain-induced Martensite During Plastic Deformation of Metastable Austenitic Stainless Steels
Juho Talonen,Hannu Hänninen +1 more
TL;DR: In this paper, the effects of external stress and stacking fault energies (SFE) on the width of the stacking faults were analyzed and an excellent correlation between the calculations and actual microstructures examined by scanning electron microscopy was found.
Journal ArticleDOI
Twinning and martensite in a 304 austenitic stainless steel
TL;DR: The microstructure characteristics and deformation behavior of 304L stainless steel during tensile deformation at two different strain rates have been investigated by means of interrupted tensile tests, electron-backscatter-diffraction and transmission electron microscopy (TEM) techniques as discussed by the authors.