Influence of the Different Modes of Hot Deformation within the Steady State on Static Recrystallization Kinetics and Recrystallized Grain Size of Commercial Aluminium

1993 ◽  
Vol 113-115 ◽  
pp. 497-502 ◽  
Author(s):  
S. Martin ◽  
S. Gutierrez ◽  
J.J. Urcola
Keyword(s):  
Grain Size ◽  
Steady State ◽  
Hot Deformation ◽  
Static Recrystallization ◽  
Recrystallization Kinetics ◽  
Commercial Aluminium ◽  
Recrystallized Grain Size

scholarly journals Effect of Strain-Induced Precipitation on the Recrystallization Kinetics in a Model Alloy

2021 ◽  
Author(s):  
Mo Ji ◽  
Martin Strangwood ◽  
Claire Davis
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Avrami Exponent ◽  
Model Alloy ◽  
Size Distributions ◽  
Recrystallization Kinetics ◽  
Grain Size Distributions ◽  
Recrystallized Grain Size ◽  
Nb Addition

AbstractThe effects of Nb addition on the recrystallization kinetics and the recrystallized grain size distribution after cold deformation were investigated by using Fe-30Ni and Fe-30Ni-0.044 wt pct Nb steel with comparable starting grain size distributions. The samples were deformed to 0.3 strain at room temperature followed by annealing at 950 °C to 850 °C for various times; the microstructural evolution and the grain size distribution of non- and fully recrystallized samples were characterized, along with the strain-induced precipitates (SIPs) and their size and volume fraction evolution. It was found that Nb addition has little effect on recrystallized grain size distribution, whereas Nb precipitation kinetics (SIP size and number density) affects the recrystallization Avrami exponent depending on the annealing temperature. Faster precipitation coarsening rates at high temperature (950 °C to 900 °C) led to slower recrystallization kinetics but no change on Avrami exponent, despite precipitation occurring before recrystallization. Whereas a slower precipitation coarsening rate at 850 °C gave fine-sized strain-induced precipitates that were effective in reducing the recrystallization Avrami exponent after 50 pct of recrystallization. Both solute drag and precipitation pinning effects have been added onto the JMAK model to account the effect of Nb content on recrystallization Avrami exponent for samples with large grain size distributions.

Study on Multifractal of Recrystallized Microstructure for TB8 Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 1569-1573
Author(s):  
Ping Li ◽  
Ai Qin Nie ◽  
Ke Min Xue
Keyword(s):  
Grain Size ◽  
Probability Measure ◽  
Fractal Analysis ◽  
Hot Deformation ◽  
Solution Treatment ◽  
Analysis Program ◽  
Material Microstructure ◽  
Multifractal Spectra ◽  
Fractal Spectrum ◽  
Recrystallized Grain Size

On the basis of MATLAB software，multi-fractal analysis program has been developed．Systematic fractal analysis of micrographs of TB8 alloy after hot compression deformation and solution treatment has been conducted．Corresponding probability measure and scale exponent from the microstructure images can be acquired and the multifractal spectra can be calculated．The results show that the microstructure of TB8 alloy after hot deformation and solution treatment has the characteristic of multi-fractal within the computing scale．And with increase of the recrystallized grain size and decrease of the deformed grain size，the width of the multi-fractal spectrum Δα decreases and the microstructure distribution is homogeneous．Furthermore，with increase of the recrystallization percent，the value between the maximum and minimum subset dimension Δf increases．It indicates that the recrystallized grains are the dominant factors in determining the size distribution in the microstructure and the grains are fine and uniform．These studies supply a new method for analyzing material microstructure quantitatively

Quantitative Description of the Structure and Substructure of Hot − Deformed Fe – Ni Austenitic Alloy

2006 ◽  
Vol 513 ◽  
pp. 51-60 ◽  
Author(s):  
Kazimierz J. Ducki ◽  
Marek Hetmańczyk ◽  
Dariusz Kuc
Keyword(s):  
Grain Size ◽  
Hot Deformation ◽  
Structural Parameters ◽  
Quantitative Description ◽  
Hollomon Parameter ◽  
Plastic Properties ◽  
Austenitic Alloy ◽  
Functional Relations ◽  
The Mean ◽  
Recrystallized Grain Size

The paper presents the results of research concerning the influence of hot deformation parameters on the structure and substructure as well as the plastic properties of a Fe–Ni austenitic alloy. The research was performed on a torsion plastometer in the range of temperatures of 900÷1150°C, at a strain rate 0.1 and 1.0 s-1. Plastic flow curves have been drawn up and the interrelations have been determined between the process parameters and the recrystallized grain size, inhomogeneity and shape. Functional relations between the Zener-Hollomon parameter and the mean grain size after dynamic recrystallization have been developed and the hot deformation activation energy has been estimated. The examination of substructure on TEM allowed the calculation of structural parameters: the average subgrain area and the mean dislocation density. A detailed investigation has shown that the substructure is inhomogeneous, consists of dense dislocation walls, subgrains and recrystallized regions.

Study of Dynamic Precipitation during Hot Deformation of Mg-Al-Sn Alloys

2013 ◽  
Vol 765 ◽  
pp. 461-465 ◽  
Author(s):  
Abu Syed Humaun Kabir ◽  
Jing Su ◽  
In Ho Jung ◽  
Stephen Yue
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Hot Deformation ◽  
Deformation Behaviour ◽  
Recrystallization Process ◽  
Dynamic Precipitation ◽  
Deformation Degree ◽  
Pinning Effect ◽  
Modeling Software ◽  
Recrystallized Grain Size

The objective of this work is to investigate the effect of dynamic precipitation on the hot deformation behaviour of magnesium. Mg-Al-Sn alloys have been designed using thermodynamic modeling software, FactSage, based on precipitation of Mg2Sn at hot deformation temperatures. Uniaxial compression has been introduced at the temperature range of 250-350 °C to enhance the formation of precipitates. The flow behaviour and microstructural evolvement were studied for a strain rate of 0.01 /sand deformation degree of 90 %. Dynamic recrystallization (DRX) occurs in this study and it is found that the volume percent of dynamic recrystallization and dynamically recrystallized grain size are related to the amount of precipitation formed during deformation. The formation of Mg2Sn precipitates during the dynamic recrystallization process may retard the dynamic recrystallization and slow down the grain growth by precipitation pinning effect at the DRX grain boundaries, resulting in a finer grain size.

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