Control of the Mechanical Asymmetry in an Extruded MN11 Alloy by Static Annealing

2014 ◽  
Vol 45 (8) ◽  
pp. 3282-3291 ◽  
Author(s):  
Paloma Hidalgo-Manrique ◽  
S. B. Yi ◽  
J. Bohlen ◽  
D. Letzig ◽  
M. T. Pérez-Prado
Keyword(s):  
Static Annealing

Microstructural changes in equal channel angular pressed low carbon steel by static annealing

2000 ◽  
Vol 48 (12) ◽  
pp. 3245-3252 ◽  
Author(s):  
Dong Hyuk Shin ◽  
Byung Cheol Kim ◽  
Kyung-Tae Park ◽  
Wung Yong Choo
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Microstructural Changes ◽  
Static Annealing

An Analysis of Deformation Microstructure and Subsequent Recrystallisation in Hot Deformed Aluminium Alloy AA5052 Using Forward and Reverse Torsion

2007 ◽  
Vol 550 ◽  
pp. 223-228 ◽  
Author(s):  
M. Lopez-Pedrosa ◽  
Bradley P. Wynne ◽  
Mark W. Rainforth
Keyword(s):  
Misorientation Angle ◽  
Strain Path ◽  
Deformation Mode ◽  
Grain Structure ◽  
Deformation Microstructure ◽  
The Maximum Principle ◽  
Fine Grain ◽  
Macroscopic Deformation ◽  
Instantaneous Deformation ◽  
Static Annealing

The effects of strain path reversal on the microstructure in AA5052 have been studied using high resolution EBSD. Deformation was carried out using two equal steps of forward/forward (F/F) or forward/reverse (F/R) torsion at a temperature of 300°C and strain rate of 1s-1 to a total strain of 0.5. In both cases the deformation microstructure in the majority of grains analysed consisted of microband arrays clustering at specific angles to the macroscopic deformation axes. For the F/F condition microbands clustered around -20° and +45° to the maximum principle stress direction, whilst for the F/R condition significantly more spread in microband angle was observed. This suggests that the microbands formed in the forward deformation have or are dissolving and any new microbands formed are related to the deformation conditions of the final strain path. This leads to the conclusion that instantaneous deformation mode determines the orientation of new microbands formed whilst a non-linear strain path history influences the range of misorientation angle in the material through the dissociation of previously formed microbands and the formation of new microbands at the new straining condition, leading to a lower level of misorientation angle. Analysis of material subjected to static annealing at 400°C for 1 hour appears to correspond with these observations as the F/F material was completely recrystallised with a fine grain structure whilst the F/R material had no major signs of recrystallisation.

Influence of deformation twinning on static annealing of AZ31 Mg alloy

2013 ◽  
Vol 61 (16) ◽  
pp. 5966-5978 ◽  
Author(s):  
Amanda Levinson ◽  
Raja K. Mishra ◽  
Roger D. Doherty ◽  
Surya R. Kalidindi
Keyword(s):  
Deformation Twinning ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Static Annealing

Effect of the Annealing Conditions on the Microstructure and Mechanical Properties of a 0.04% C Al Killed Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4208-4213
Author(s):  
Jacobo J. Cardozo ◽  
A.L. Rivas ◽  
R. Colas
Keyword(s):  
Mechanical Properties ◽  
Heating Rate ◽  
Deep Drawing ◽  
Heating Temperature ◽  
Grain Structure ◽  
Major Influence ◽  
Heating Rates ◽  
Annealing Conditions ◽  
Static Annealing ◽  
Initial Heating

The present investigation evaluates the effect of static annealing variables on the grain structure and mechanical properties of a 0.04 %C-Al killed steel. The experimental variables selected were the heating rate and the initial heating temperature. The results showed that an increase in the initial heating temperature and heating rates inferior to 500°C and 100°C/h, respectively, do not have a major influence in the grain structure of the material. These annealing conditions lead to a full "pancake" type of microstructure of the recrystallized ferrite grain, and as consequence, the mechanical properties of the material are in the intervals required for deep drawing applications.

Microstructure Evolution in a 3%Co Modified P911 Heat Resistant Steel under Creep Conditions

2010 ◽  
Vol 89-91 ◽  
pp. 295-300 ◽  
Author(s):  
Alla Kipelova ◽  
Rustam Kaibyshev ◽  
Andrey Belyakov ◽  
Izabella Schenkova ◽  
Vladimir Skorobogatykh
Keyword(s):  
Structural Changes ◽  
Elevated Temperatures ◽  
Second Phase ◽  
Resistant Steel ◽  
Creep Tests ◽  
Tempering Temperature ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Static Annealing ◽  
Average Size

The microstructural changes in a 3%Co modified P911 heat resistant steel were examined under static annealing and creep at elevated temperatures. The quenched steel was tempered at temperatures ranging from 673 to 1073 K for 3 hours. The temperature dependence of hardness for the tempered samples exhibits the maximum at 723 – 823 K which is associated with the precipitations of fine carbides with an average size of about 20 nm. The transverse lath size of martensitic structure is  200 nm after air quenching and remains unchanged under tempering at temperatures below 800 K. An increase in tempering temperature to 1073 K resulted in hardness drop. Coagulation of carbides and growth of martensitic laths takes place at these temperatures. The creep tests were carried out at 873 and 923 K up to rupture, which occurred after about 4.5 × 103 hours. The structural changes in crept specimens were characterized by the development of coarse laths/subgrains. The mean transverse size of which was  0.67 and  1.3 m after the creep tests at 873 and 923 K, respectively. On the other hand, an average size of second phase particles of  165 nm was observed in the samples tested at both temperatures.

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