scholarly journals Second Phase Precipitation in As-Welded and Solution Annealed Alloy 22 Welds

2005 ◽  
Author(s):  
Bassem S. El-Dasher ◽  
Sharon G. Torres
Keyword(s):  
Large Scale ◽  
Thick Plate ◽  
Electron Backscatter Diffraction ◽  
Second Phase ◽  
Solution Annealing ◽  
Annealed Alloy ◽  
Precipitation Characteristics ◽  
Alloy 22 ◽  
Tcp Phases ◽  
Backscatter Diffraction

The precipitation characteristics of tetrahedrally close-packed (TCP) phases during the welding and the subsequent solution annealing process of Alloy 22 1 1/2” thick plate double-U prototypical welds are investigated. Electron backscatter diffraction (EBSD) was used to provide large scale microstructural observation of the weld cross section, and scanning electron microscopy (SEM) was used to map the location of the TCP phases. Analysis shows that TCP precipitation occurs congruent to the weld passes, with the solution annealing reducing the sizes of coarser precipitates.

scholarly journals Second Phase Precipitation in As-Welded and Solution Annealed Alloy 22 Welds

2006 ◽  
Vol 128 (4) ◽  
pp. 644-647 ◽  
Author(s):  
Bassem S. El-Dasher ◽  
Sharon G. Torres
Keyword(s):  
Large Scale ◽  
Thick Plate ◽  
Electron Backscatter Diffraction ◽  
Second Phase ◽  
Solution Annealing ◽  
Annealed Alloy ◽  
Precipitation Characteristics ◽  
Alloy 22 ◽  
Tcp Phases ◽  
Backscatter Diffraction

The precipitation characteristics of tetrahedrally close-packed (TCP) phases during the welding and the subsequent solution annealing process of Alloy 22 1 1∕2in. thick plate double-U prototypical welds are investigated. Electron backscatter diffraction was used to provide large scale microstructural observation of the weld cross section, and scanning electron microscopy was used to map the location of the TCP phases. Analysis shows that TCP precipitation occurs congruent to the weld passes, with the solution annealing reducing the sizes of coarser precipitates.

scholarly journals A New Electron Backscatter Diffraction-Based Method to Study the Role of Crystallographic Orientation in Ductile Damage Initiation

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 113
Author(s):  
Behnam Shakerifard ◽  
Jesus Galan Lopez ◽  
Leo A. I. Kestens
Keyword(s):  
Crystallographic Orientation ◽  
Electron Backscatter Diffraction ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Second Phase ◽  
Post Mortem ◽  
Bainitic Steel ◽  
Damage Initiation ◽  
Electron Backscatter ◽  
Backscatter Diffraction

The third generation of advanced high strength steels shows promising properties for automotive applications. The macroscopic mechanical response of this generation can be further improved by a better understanding of failure mechanisms on the microstructural level and micro-mechanical behavior under various loading conditions. In the current study, the microstructure of a multiphase low silicon bainitic steel is characterized with a scanning electron microscope (SEM) equipped with an electron backscatter diffraction detector. A uniaxial tensile test is carried out on the bainitic steel with martensite and carbides as second phase constituents. An extensive image processing on SEM micrographs is conducted in order to quantify the void evolution during plastic deformation. Later, a new post-mortem electron backscatter diffraction-based method is introduced to address the correlation between crystallographic orientation and damage initiation. In this multiphase steel, particular crystallographic orientation components were observed to be highly susceptible to micro-void formation. It is shown that stress concentration around voids is rather relaxed by void growth than local plasticity. Therefore, this post-mortem method can be used as a validation tool together with a crystal plasticity-based hardening model in order to predict the susceptible crystallographic orientations to damage nucleation.

scholarly journals Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation

2018 ◽  
Vol 8 (1) ◽  
pp. 391-394 ◽  
Author(s):  
Mária Zemková ◽  
Róbert Král ◽  
Jakub Čížek ◽  
Jana Šmilauerová ◽  
Peter Minárik
Keyword(s):  
Corrosion Resistance ◽  
Dislocation Density ◽  
Electrochemical Properties ◽  
Polarization Resistance ◽  
Electron Backscatter Diffraction ◽  
Positron Annihilation Spectroscopy ◽  
Second Phase ◽  
Angular Pressing ◽  
Second Phase Particles ◽  
Backscatter Diffraction

Abstract The effect of subsequent annealing on the electrochemical properties of an AZ31 magnesium alloy processed by extrusion and equal channel angular pressing (ECAP) was investigated. The electrochemical properties were evaluated using potentiodynamic tests in corrosion solution of 0.1 M sodium chloride. The electrochemical changes after annealing were correlated with microstructure evolution. The microstructure was analyzed by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The evolution of dislocation density was determined by positron annihilation spectroscopy (PAS). The annealing for 1h at temperatures ranging from 150∘C to 250∘C resulted in higher polarization resistance in all cases. The polarization resistance of sample annealed at 250∘C was ~17% higher compared to just ECAPed material. Combination of gradual decrease of dislocation density, grain growth and second phase particles dissolution played the crucial role in the corrosion resistance improvement.

scholarly journals Effect of Trace Elements on the Crystallization Temperature Interval and Properties of 5xxx Series Aluminum Alloys

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 483 ◽  
Author(s):  
Qianqian Li ◽  
Mengjia Li ◽  
Guangxi Lu ◽  
Shaokang Guan ◽  
Engui Zhang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Temperature Interval ◽  
Crystallization Temperature ◽  
Electron Backscatter Diffraction ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Goss Texture ◽  
Mechanical Properties And Corrosion ◽  
Backscatter Diffraction

The influence of alloying elements Er, Zr, Cu, Si and Zn on the crystallization temperature interval, microstructure, mechanical properties and corrosion behavior of Al-Mg-Mn alloy were studied by differential scanning calorimetry (DSC), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), tensile testing, electrochemical measurements and nitric acid mass loss test (NAMLT). The results show that the crystallization temperature range of Al-Mg-Mn alloy with addition of Zn decreased 4.7 °C. Cold rolled alloys mainly contain S texture, Copper texture, Brass texture, and Goss texture; the content of the S texture is the highest. With the addition of trace elements, the second phase Al3Er, Al3Zr, Al2CuMg, Mg2Si and MgZn2 can be formed, which can improve the tensile strength and yield strength of Al-Mg-Mn alloy. The addition of the alloying element Zn can also improve the intergranular corrosion resistance of the Al-Mg-Mn alloy.

Identification and Quantification of Topologically Close Packed Phases (TCP) in Alloy 22 Using Electron Backscatter Diffraction (EBSD) Analysis

2004 ◽  
Vol 10 (S02) ◽  
pp. 960-961 ◽  
Author(s):  
Bassem S El-Dasher ◽  
Sharon G Torres ◽  
Tammy S Summers
Keyword(s):  
Electron Backscatter Diffraction ◽  
Ebsd Analysis ◽  
Topologically Close Packed ◽  
Alloy 22 ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Identification And Quantification

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Electron backscatter diffraction analysis of Pb(Mg1/3Nb2/3)O3–35mol%PbTiO3 single crystals grown by seeded polycrystal conversion

2001 ◽  
Vol 16 (3) ◽  
pp. 694-700 ◽  
Author(s):  
Ajmal Khan ◽  
Derrick T. Carpenter ◽  
Adam M. Scotch ◽  
Helen M. Chan ◽  
Martin P. Harmer
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Electron Backscatter Diffraction ◽  
Second Phase ◽  
Crystal Imperfections ◽  
Simple Boundary ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Crystal Seed ◽  
Grown Single Crystal

Electron backscatter diffraction (EBSD) has been applied to characterize Pb(Mg1/3Nb2/3)O3–35 mol%PbTiO3 single crystals grown by the seeded polycrystal conversion method. Macroscopically triangular crystal growth fronts were shown to each be associated with discrete crystals that originated from slightly misoriented segments of an initially cracked single-crystal seed plate. Various types of crystal imperfections, including voids, second-phase regions, and polycrystalline matrix grains trapped within the grown region, were readily identified and distinguished from one another using EBSD. Further, it was shown that trapped matrix grains in the grown region had consistently small misorientations with respect to the grown single crystal and this may be qualitatively explained by a simple boundary energetics argument. The significance of the trapped grains is discussed.

Microstructure, Texture and Property of Interstitial-Free (IF) Steel after Ultra-Fast Annealing

2015 ◽  
Vol 1120-1121 ◽  
pp. 1003-1007 ◽  
Author(s):  
He Long Cai ◽  
Jun Sheng Mou ◽  
Zi Yong Hou
Keyword(s):  
Electron Microscopy ◽  
Electron Backscatter Diffraction ◽  
Second Phase ◽  
Interstitial Free ◽  
If Steel ◽  
Steel Sheets ◽  
Transmission Electron ◽  
Second Phase Particles ◽  
Backscatter Diffraction ◽  
Equiaxed Grain

In this paper, common continous annealing (CCA) and ultra-fast annealing (UFA) were carried out on a cold-rolled interstitial-free (IF) steel, respectively. The microstructure of the annealed IF steel was characterized by means of scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The mechanical property was examined using tensile test. The optimum annealing process parameters were then obtained. The results showed that, the recrystallization occurs at the temperature in the range of 780-830°C. The fraction of equiaxed grain increases with the annealing temperature increasing. The well combination of mechanical properties and formability was obtained when the IF steel annealed at 820°C, which was the result of the fine dispersed second phase particles. {001} texture was absent in the whole thickness of all the annealed IF steels. In addition, the strongest γ texture was found, and this was a potential way to improve the deep drawability of annealed steel sheets.

The Impact of Dislocation Structure on Impurity Decoration of Dislocation Clusters in Multicrystalline Silicon

2013 ◽  
Vol 205-206 ◽  
pp. 71-76 ◽  
Author(s):  
Maulid Kivambe ◽  
Gaute Stokkan ◽  
Torunn Ervik ◽  
Sergio Castellanos ◽  
Jasmin Hofstetter ◽  
...  
Keyword(s):  
Dislocation Structure ◽  
Electron Backscatter Diffraction ◽  
Multicrystalline Silicon ◽  
Second Phase ◽  
Directionally Solidified ◽  
Dislocation Interaction ◽  
Transmission Electron ◽  
Nucleation Sites ◽  
Backscatter Diffraction ◽  
The Impact

Light microscopy, electron backscatter diffraction and transmission electron microscopy is employed to investigate dislocation structure and impurity precipitation in commonly occurring dislocation clusters as observed on defect-etched directionally solidified multicrystalline silicon wafers. The investigation shows that poligonised structures consist of parallel mostly similar, straight, well-ordered dislocations, with minimal contact-interaction and no evidence of precipitate decoration. On the other hand, disordered structures consist of various dislocation types, with interactions being common. Decoration of dislocations by second phase particles is observed in some cases. Enhanced recombination activity of dislocations may therefore be a result of dislocation interaction forming tangles, microscopic kinks and jogs, which can serve as heterogeneous nucleation sites that enhance metallic decoration.

The Interface Character Distribution and Intergrannular Corrosion Resistance of Duplex Stainless Steel UNS S32304

2016 ◽  
Vol 879 ◽  
pp. 536-541
Author(s):  
Jian Sheng Zhang ◽  
Yan Li Zhu ◽  
Xiao Ying Fang ◽  
Wen Hong Yin ◽  
Cong Xiang Qin
Keyword(s):  
Solid Solution ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Electron Backscatter Diffraction ◽  
Solution Annealing ◽  
Phase Boundaries ◽  
Electron Backscatter ◽  
Character Distribution ◽  
Backscatter Diffraction

The duplex stainless steels (UNS S32304) after solid solution annealing at two different temperature (1323K and 1573K) were subjected to the same cold rolling with ε =3 and subsequent annealing for 230 min at 1323 K . The corresponding interface character distribution (ICD) were determined by electron backscatter diffraction (EBSD). The results show that a larger population of phase boundaries (PB) having K-S orientation relationship (OR) between the neighboring δ and γ grains was introduced and therefore higher intergrannular corrosion resistance (ICR) were resulted in the specimen initially solid-solution annealed at 1573K.

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