An Assessment of Bulk and Local Stored Energy Measurements in Ultrafine Grained Interstitial Free Steel

2010 ◽  
Vol 89-91 ◽  
pp. 244-249 ◽  
Author(s):  
Sujoy S. Hazra ◽  
Azdiar A. Gazder ◽  
Elena V. Pereloma
Keyword(s):  
Profile Analysis ◽  
Energy Estimates ◽  
Internal Stresses ◽  
Line Profile Analysis ◽  
Interstitial Free ◽  
Stored Energy ◽  
Scanning Calorimetry ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Interstitial Free Steel

The evolution of stored energy and associated thermal behaviour was investigated for an ultrafine grained Ti-IF steel severely deformed by Equal Channel Angular Pressing (ECAP) followed by cold rolling at ambient and liquid nitrogen temperatures. Bulk stored energy measurements by Differential Scanning Calorimetry (DSC) returned 350-600 whereas local stored energy estimates from microhardness, Electron Back-Scattering Diffraction (EBSD) and X-ray line profile analysis resulted in 5-140 . Higher bulk stored energy values correspond to the enthalpy release from all sources of strain in the material volume as well as Ti precipitation during annealing while the lower local stored energy range alludes only to dislocation content or internal stresses. An apparent activation energy of 500-550 suggests sluggish recrystallisation due to excess of Ti in solid solution.

Equal channel angular pressing processing routes and associated structure modification: a differential scanning calorimetry and X-ray line profile analysis

2012 ◽  
Vol 27 (3) ◽  
pp. 194-199 ◽  
Author(s):  
A. Sarkar ◽  
Satyam Suwas ◽  
D. Goran ◽  
J.-J. Fundenberger ◽  
L.S. Toth ◽  
...  
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Equal Channel Angular Pressing ◽  
Line Profile ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
Stored Energy ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Angular Pressing

The effectiveness of different routes of equal channel angular pressing (A, Bc, and C) is studied for commercially pure copper. The stored energy and the activation energy of recrystallization for the deformed samples were quantified using differential scanning calorimetry and X-ray diffraction line profile analysis. Results of the study revealed that the dislocation density and the stored energy are higher in the case of route Bc deformed sample. The activation energy for recrystallization is lower for route Bc.

scholarly journals Precipitation Microstructure of Ultrafine-Grained Al-Zn-Mg Alloys Processed by Severe Plastic Deformation

2007 ◽  
Vol 537-538 ◽  
pp. 169-176 ◽  
Author(s):  
Jenő Gubicza ◽  
I. Schiller ◽  
Nguyen Q. Chinh ◽  
Judit Illy
Keyword(s):  
Profile Analysis ◽  
High Strength ◽  
Precipitation Process ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
Diffraction Line Profile ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Ultrafine Grained ◽  
Precipitation Microstructure

Supersaturated Al-4.8Zn-1.2Mg-0.14Zr and Al-5.7Zn-1.9Mg-0.35Cu (wt.%) alloys were processed by Equal-Channel Angular Pressing (ECAP) at 200°C. The crystallite size distribution and the characteristic parameters of the dislocation structure of both Al matrix and precipitates were determined by X-ray diffraction line profile analysis, which has been complemented by transmission electron microscopy (TEM) observations. Results of these investigations show that the bulk ultrafine-grained microstructure with high dislocation density produced by ECAP has strong influence on the precipitation process, resulting in high strength in both alloys.

Microstructure and Mechanical Behavior of Ultrafine-Grained Titanium

2008 ◽  
Vol 589 ◽  
pp. 99-104 ◽  
Author(s):  
Jenő Gubicza ◽  
Z. Fogarassy ◽  
György Krállics ◽  
János L. Lábár ◽  
Tamás Törköly
Keyword(s):  
Mechanical Behavior ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Line Profile ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Ultrafine Grained ◽  
Deformation Processes

Ultrafine-grained titanium was processed by severe plastic deformation (SPD). The SPD was carried out by equal channel angular pressing (ECAP) at high temperature. The ECAPprocessed sample was further deformed by conventional techniques such as radial forging and drawing. The microstructure was characterized quantitatively by X-ray diffraction line profile analysis and transmission electron microscopy after each step of deformation. The effect of procesing routes on the mechanical behavior was also studied. It was found that the conventional deformation processes after ECAP result in further increment in dislocation density and strength at the expense of ductility.

scholarly journals Analysis of Recrystallization Peak Occuring During DSC Measurement

2018 ◽  
Vol 1 (2) ◽  
pp. 73-76
Author(s):  
Gergő Richárd Fejes ◽  
Viktor Gonda ◽  
Károly Széll
Keyword(s):  
Differential Scanning Calorimetry ◽  
Plastic Deformation ◽  
Elevated Temperature ◽  
Measurement Data ◽  
Stored Energy ◽  
Scanning Calorimetry ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Kinetics Of

Abstract Severe plastic deformation (SPD) is a well-established methodology for the processing of bulk ultrafine grained materials. Among various methods, equal channel angular pressing (ECAP) is the most popular way of creating ultrafine grained materials. The stored energy after ECAP in these substances highly influences the microstructural processes: recovery and recrystallization of the processed materials. We analyzed the recrystallization kinetics of room and elevated temperature ECAP processed copper samples using differential scanning calorimetry (DSC). For the processing of the measurement data we developed a MATLAB processing routine.

scholarly journals Bulk Ultrafine-Grained Interstitial-Free Steel Processed by Equal-Channel Angular Pressing Followed by Flash Annealing

2016 ◽  
Vol 25 (12) ◽  
pp. 5157-5166 ◽  
Author(s):  
Deepa Verma ◽  
Shobhit A. Pandey ◽  
Anushka Bansal ◽  
Shwetank Upadhyay ◽  
N. K. Mukhopadhyay ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Interstitial Free ◽  
Angular Pressing ◽  
Flash Annealing ◽  
Ultrafine Grained ◽  
Interstitial Free Steel
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