High-temperature electron backscatter diffraction and scanning electron microscopy imaging techniques: In-situ investigations of dynamic processes

Scanning ◽  
2006 ◽  
Vol 24 (5) ◽  
pp. 232-240 ◽  
Author(s):  
G. G. E. Seward ◽  
D. J. Prior ◽  
J. Wheeler ◽  
S. Celotto ◽  
D. J. M. Halliday ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electron Backscatter Diffraction ◽  
Imaging Techniques ◽  
Dynamic Processes ◽  
Microscopy Imaging ◽  
Electron Backscatter ◽  
Temperature Electron ◽  
Backscatter Diffraction ◽  
Scanning Electron

Structure of Intermetallic Al–Si Coating on Inconel 617

2014 ◽  
Vol 782 ◽  
pp. 594-597
Author(s):  
Agnieszka Kochmańska ◽  
Paweł Kochmański
Keyword(s):  
Electron Microscopy ◽  
Electron Backscatter Diffraction ◽  
Nickel Superalloy ◽  
Argon Atmosphere ◽  
Aluminide Coatings ◽  
Electron Backscatter ◽  
Inconel 617 ◽  
Slurry Method ◽  
Backscatter Diffraction ◽  
Scanning Electron

Nickel superalloy was coated by aluminide coatings by the slurry method. The slurry as active mixture containing aluminium and silicon powders, an activator and a binder. The coating were obtained by annealed in argon atmosphere. The structure of these coatings is two zonal and depends on time and temperature of producing. The phase composition was determined using following techniques: scanning electron microscopy (SEM) equipped with Xray microanalysis (EDS) combined with electron backscatter diffraction (EBSD) and Xray diffraction (XRD).

Anisotropic Mechanical Properties of Pure Magnesium Analyzed by In Situ Nanoindentation

2015 ◽  
Vol 662 ◽  
pp. 11-14
Author(s):  
Jiří Bočan ◽  
Jan Maňák ◽  
Aleš Jäger
Keyword(s):  
Elastic Modulus ◽  
Crystallographic Orientation ◽  
Electron Backscatter Diffraction ◽  
Nanomechanical Properties ◽  
Anisotropic Mechanical Properties ◽  
Electron Backscatter ◽  
Individual Grains ◽  
Backscatter Diffraction ◽  
Scanning Electron

In this work, correlation between nanomechanical properties and crystallographic orientation of grains in 99.9 % magnesium is presented. Crystallographic orientation of individual grains was obtained by scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD) detector. Hardness and elastic modulus of grains with known orientation were subsequently determined by in situ nanoindentation in SEM. We show that hardness decreases with increasing angle between the direction of indentation and thec-axis of grains, while elastic modulus varies non-monotonically.

Effect of Rolling Parameters on the Low-Temperature Toughness and Microstructure of High-Strength Linepipe Steel

2016 ◽  
Author(s):  
C. Stallybrass ◽  
A. Völling ◽  
H. Meuser ◽  
F. Grimpe
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Electron Backscatter Diffraction ◽  
High Strength ◽  
Processing Parameters ◽  
Small Scale ◽  
Electron Backscatter ◽  
Low Temperature Toughness ◽  
Backscatter Diffraction ◽  
Scanning Electron

In recent years, large-diameter pipe producers around the world have witnessed a growing interest to develop gas fields in arctic environments in order to fulfill the energy demand. High-strength linepipe grades are attractive for economic reasons, because they offer the benefit of a reduced wall thickness at a given operating pressure. Excellent low-temperature toughness of the material is essential under these conditions. Modern high-strength heavy plates used in the production of UOE pipes are produced by thermomechanical rolling followed by accelerated cooling (TMCP). The combination of high strength and high toughness of these steels is a result of the bainitic microstructure and is strongly influenced by the processing parameters. For this reason, the relationship between rolling and cooling parameters of heavy plate production, the low-temperature toughness and the microstructure is at the center of attention of the development efforts at Salzgitter Mannesmann Forschung (SZMF) in collaboration Salzgitter Mannesmann Grobblech (SMGB). It has been shown previously that a variation of the processing parameters has a direct influence on the microstructure and correlates with mechanical properties that are accessible via small-scale tests. Modern characterization methods such as scanning electron microscopy in combination with electron backscatter diffraction have broadened our understanding of the underlying mechanisms and have helped to define processing conditions for the production of heavy plates with optimized low-temperature toughness in small scale tests. Within the present paper, the results of a recent laboratory investigation of the effect of a systematic variation of rolling parameters on the microstructure and low-temperature toughness of as-rolled and pre-strained Charpy specimens are discussed. In these trials, final rolling temperatures above the onset of the ferrite-austenite transformation and cooling stop temperatures above the martensite start temperature were selected. The microstructure of the plates was investigated by scanning electron microscopy and electron backscatter diffraction. In a series of Charpy tests in a specific temperature range, it was found that plate material in the as-rolled condition is not strongly sensitive to variations of the selected processing parameters, whereas pre-straining the Charpy specimens made it possible to assess the potential of individual processing concepts particularly with regard to low-temperature toughness. In addition to Charpy testing, the toughness was also quantified via instrumented drop-weight tear (DWT) testing. By comparing total energy values from regular pressed-notch DWT-test specimens to J-integral values determined in drop-weight testing of pre-fatigued DWT-test specimens, the impact of variations of specimen type on material tearing resistance is shown.

Oxide Scales Grown on Stainless Steels during Simulated Reheat

2006 ◽  
Vol 15-17 ◽  
pp. 792-797 ◽  
Author(s):  
M.A.E. Jepson ◽  
C.L. Verona ◽  
R.L. Higginson
Keyword(s):  
Electron Microscopy ◽  
Stainless Steels ◽  
316L Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Oxide Scales ◽  
Crystal Direction ◽  
X Ray ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Scanning Electron

including, external oxide layers, internal grain boundary oxidation structures as well as many other forms of internal oxidation. During the present study, needle like grains of hematite have been observed within the top layers of a number of external oxide scales formed during simulated reheat of 316L stainless steel. It is believed that these needles are caused by the decomposition of an iron rich spinel (approximated to magnetite) along a preferred crystal direction within the spinel grains. The needles have been studied using optical microscopy, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD).

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