scholarly journals The effect of Mn content on the texture of aluminium alloys in cold rolled and annealed state

2018 ◽  
Vol 426 ◽  
pp. 012017
Author(s):  
A Hlavacs ◽  
D Petho ◽  
DA Angel ◽  
E Nagy ◽  
V Mertinger ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Annealed State ◽  
Mn Content ◽  
Cold Rolled

scholarly journals Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 476
Author(s):  
Sayed Amer ◽  
Ruslan Barkov ◽  
Andrey Pozdniakov
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Mechanism Of Action ◽  
Annealing Temperature ◽  
Eutectic Reaction ◽  
Solidification Process ◽  
Annealed State ◽  
Microstructure And Mechanical Properties ◽  
Cold Rolled ◽  
Hot Rolled

Microstructure of Al-Cu-Yb and Al-Cu-Gd alloys at casting, hot-rolled -cold-rolled and annealed state were observed; the effect of annealing on the microstructure was studied, as were the mechanical properties and forming properties of the alloys, and the mechanism of action was explored. Analysis of the solidification process showed that the primary Al solidification is followed by the eutectic reaction. The second Al8Cu4Yb and Al8Cu4Gd phases play an important role as recrystallization inhibitor. The Al3Yb or (Al, Cu)17Yb2 phase inclusions are present in the Al-Cu-Yb alloy at the boundary between the eutectic and aluminum dendrites. The recrystallization starting temperature of the alloys is in the range of 250–350 °C after rolling with previous quenching at 590 and 605 °C for Al-Cu-Yb and Al-Cu-Gd, respectively. The hardness and tensile properties of Al-Cu-Yb and Al-Cu-Gd as-rolled alloys are reduced by increasing the annealing temperature and time. The as-rolled alloys have high mechanical properties: YS = 303 MPa, UTS = 327 MPa and El. = 3.2% for Al-Cu-Yb alloy, while YS = 290 MPa, UTS = 315 MPa and El. = 2.1% for Al-Cu-Gd alloy.

Influence of Continuous and Discontinuous Recrystallization on the Properties of Cold-Rolled Sheets from Aluminium Alloys

2002 ◽  
Vol 396-402 ◽  
pp. 581-586
Author(s):  
I.N. Fridlyander ◽  
O.E. Grushko ◽  
V.V. Berstenev ◽  
L.M. Sheveleva ◽  
L.A. Ivanova
Keyword(s):  
Aluminium Alloys ◽  
Cold Rolled

Recrystallisation Resistance of Extruded and Cold Rolled Aluminium Alloys with Additions of Hf, Sc and Zr

2006 ◽  
Vol 519-521 ◽  
pp. 525-530 ◽  
Author(s):  
Håkon Hallem ◽  
W.J. Rittel ◽  
Børge Forbord ◽  
Knut Marthinsen
Keyword(s):  
Cold Rolling ◽  
Structural Stability ◽  
High Temperatures ◽  
High Resistance ◽  
Aluminium Alloys ◽  
Cold Rolled

A high recrystallisation resistance is required in aluminium alloys intended for processing or use at temperatures between 450°C-600°C. Additions of Hf, Sc and Zr significantly improve the resistance to recrystallisation through the formation of Al3X-dispersoids (X=Hf,Sc,Zr), and in this work different concentrations and combinations of these elements were added to five aluminium alloys. The alloys were extruded, subjected to various degrees of cold rolling (0%-80%) and finally annealed at high temperatures in order to study the structural stability. All variants displayed a high resistance towards recrystallisation, but the best results were obtained in the alloy containing only Sc and Zr. In this alloy no signs of recrystallisation were observed even after 1 hour annealing of extruded and 80% cold rolled profiles at 600°C.

Grain Refinement by Rapid Transformation Annealing of Cold Rolled Low Carbon Steels

2005 ◽  
Vol 500-501 ◽  
pp. 771-778 ◽  
Author(s):  
P. Álvarez ◽  
C. Lesch ◽  
Wolfgang Bleck ◽  
Hélène Petitgand ◽  
Joachim Schöttler ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Rapid Heating ◽  
Carbon Steels ◽  
Low Carbon ◽  
Steel Sheets ◽  
Hsla Steels ◽  
Mn Content ◽  
Cold Rolled ◽  
Equiaxed Grains ◽  
Rapid Transformation

A novel thermal treatment, rapid transformation annealing (RTA), has been applied to six different cold rolled low-carbon (LC) steel sheets with the aim of refining their microstructure. The process involves rapid heating to just above the austenite (g) to ferrite (a) transformation temperature and subsequent rapid cooling to room temperature. Grain sizes around 2 µm in two different Nb-Ti HSLA steels, 5 µm in a Ti-LC steel and 6 µm in a plain LC (0.037%C) steel have been produced using fast cooling rates (200°C/s). Non-equiaxed structures are obtained in a Nb-Ti HSIF steel and in a plain LC (0.135%C) (CM) steel due to their higher Mn content. However, very fine equiaxed grains (2 µm) are obtained by rapid intercritical annealing (RIA) in the CM steel. Irrespective of the microalloying concept, the grain growth of recrystallized a grains before their transformation was inhibited in CM and in both HSLA steels. This inhibition is connected with the overlapping of a recrystallization and a-g transformation processes which is essential in order to achieve extreme grain refinement either by RTA or RIA.

Measuring and Modelling the Microstructures of Two-Phase Aluminium Alloys after Deformation

2012 ◽  
Vol 715-716 ◽  
pp. 23-32 ◽  
Author(s):  
John F. Humphreys ◽  
Pete S. Bate ◽  
Ali Gholinia ◽  
Ian Brough
Keyword(s):  
Aluminium Alloys ◽  
Second Phase ◽  
Two Phase ◽  
New Techniques ◽  
Deformation Microstructure ◽  
Deformation Structures ◽  
Deformable Particles ◽  
Second Phase Particles ◽  
Cold Rolled ◽  
Ebsd Method

The effect of second-phase particles on the deformation and annealing behaviour of metals is re-assessed in the light of some new techniques. Using an EBSD method which provides much improved angular resolution, the effect of small non-deformable particles on the homogeneity of the deformation microstructure has been quantified. The presence of micron sized second-phase particles alters the deformation microstructure adjacent to particles, and a 3-d investigation of the deformation structures associated with large (>1μm) second-phase particles in cold rolled aluminium alloys has been carried out using 3-d FIB sectioning combined with EBSD, and the microstructures compared with the predictions of 3-d CPFEM modelling. The effects of grain orientation, strain and particle size have been investigated, and the results compared with earlier TEM investigations of such microstructures.

The Effect of Heating Rate on the Density and Spatial Distribution of Dispersoids during Homogenisation of 6xxx Aluminium Alloys

2016 ◽  
Vol 877 ◽  
pp. 322-327 ◽  
Author(s):  
Magnus S. Remøe ◽  
Knut Marthinsen ◽  
Ida Westermann ◽  
Ketill Pedersen ◽  
Jostein Røyset ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Heating Rate ◽  
Aluminium Alloys ◽  
Rapid Heating ◽  
Number Density ◽  
Heating Rates ◽  
Precipitation Behaviour ◽  
Quantitative Analyses ◽  
Mn Content

Two 6xxx alloys with different Mn-content have been homogenised in a furnace at 575 oC for 2 hours and 15 minutes. Three different heating rates to the homogenisation holding temperature were chosen, as this was expected to affect the precipitation behaviour of the dispersoids. The study focused on developing a reliable procedure for the characterization of the density and spatial distribution of dispersoids in aluminium alloys; both in terms of sample preparation, microscopic techniques and quantitative analyses of results. Scanning electron microscopy (SEM) has been used to evaluate the dispersoid characteristics for the different alloys and heating rates. The results indicate an increase in dispersoid number density and a more uniform distribution of dispersoids for the lowest heating rate, as compared to the more rapid heating rates, for the alloy with 0.05 wt% Mn. For the alloy with 0.15 wt% Mn the number density increased with the heating rate. This is suggested to be due to particle coarsening as an effect of the low heating rate where the samples spend longer time in the furnace.

The Effect of Mn Addition on Recrystallization of Cold Rolled Al-Mg-Si-Cu Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 1874-1877 ◽  
Author(s):  
You Bin Wang ◽  
Yi Lin ◽  
Jian Min Zeng
Keyword(s):  
Activation Energy ◽  
Temperature Increase ◽  
Recrystallization Temperature ◽  
Structure And Properties ◽  
Cu Alloy ◽  
Mn Content ◽  
Cold Rolled ◽  
Start Temperature

Small amounts of Mn have been used in order to modify the microstructure and thus improve the properties of the alloys. The effect of Mn addition on structure and properties of cold rolled Al-Mg-Si-Cu alloy at different annealed temperatures is presented in this paper. Both recrystallization temperature and activation energy of recrystallization are obtained from the hardness-temperature curves. The results show that Mn can have an inhibitive effect on recrystallization. Within a certain concentration of Mn in the alloy (<0.7 wt.%) both the activation energy of recrystallization and recrystallization start temperature increase with the addition of Mn content. The activation energy of recrystallization of the alloy which contains 0 wt.% Mn, 0.3 wt.% Mn and 0.7 wt.% Mn are respectively 134.4 kJ·mol-1, 137.4 kJ·mol-1 and 140.1 kJ·mol-1 and the recrystallization start temperature increases from 190 to 230 as Mn content increases from 0 to 0.7 wt.%.

Analysis of the Microstructure of High Chrome Steel for Roller under Forged Annealed State

2013 ◽  
Vol 791-793 ◽  
pp. 386-389 ◽  
Author(s):  
Jie Yang ◽  
Fang Quan
Keyword(s):  
Local Area ◽  
Chromium Steel ◽  
High Chromium ◽  
Chrome Steel ◽  
Annealed State ◽  
Hardness Tests ◽  
Cold Rolled ◽  
Generation Mechanisms ◽  
Prevention Methods ◽  
Lamellar Pearlite

Nowadays, the high chrome steel for roller is increasingly widely used in cold-rolled industry. The microstructure of rollers under forged annealed state has a significant influence on its final mechanical properties. This paper investigates the annealed microstructure of a new high chrome steel for roller, using methods of SEMDESXRD and hardness tests. The results show that the spheroidizing annealed high chromium steel is constitutive of ferrite and globular cementite, and the microstructure is relatively reasonable. But there are disadvantage characters such as small holes in the vicinity of the grain boundary, and residual lamellar pearlite exists in local area. In this paper, generation mechanisms of these characters are explained, and prevention methods are given for the weakness of the high chorme steel for roller.

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