Investigation of Deformation Mechanisms in an Austenitic Mn-Steel by means of Scanning Electron Microscopy and Electron Backscatter Diffraction

2019 ◽  
Vol 56 (6) ◽  
pp. 393-403
Author(s):  
C. Hahn ◽  
M. Lukas ◽  
G. Ressel ◽  
T. Klein ◽  
R. Ebner
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Backscatter Diffraction ◽  
Deformation Mechanisms ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Mn Steel ◽  
Scanning Electron

A Low Electron Voltage Approach to Increase Spatial Resolution of Temperature Mapping in Thermal Scanning Electron Microscopy

2013 ◽  
Vol 1525 ◽  
Author(s):  
Xiaowei Wu ◽  
Robert Hull
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Spatial Resolution ◽  
Electron Backscatter Diffraction ◽  
Mapping Technique ◽  
Thermal Diffuse Scattering ◽  
Temperature Mapping ◽  
Energy Incident ◽  
Backscatter Diffraction ◽  
Scanning Electron

ABSTRACTThermal scanning electron microscopy is a new temperature mapping technique based on thermal diffuse scattering in electron backscatter diffraction in a scanning electron microscope. It provides both nano-scale resolution and far-field non-contact temperature mapping capabilities no other methods can adequately combine. While a calculated spatial resolution of less than 100 nm has already been realized using 20 keV electrons, lower energy incident electrons should enable still higher spatial resolution (even down to 10 nm). In this paper, the feasibility of this approach is examined.

Aqueous Corrosion of Deformed Steel Under Simulated Diluted Bitumen

CORROSION ◽  
10.5006/3121 ◽  
2019 ◽  
Vol 75 (10) ◽  
pp. 1194-1206
Author(s):  
Hongxing Liang ◽  
Rebecca Filardo Schaller ◽  
Edouard Asselin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Electron Backscatter Diffraction ◽  
Pipeline Steel ◽  
Optical Microscope ◽  
Circular Ring ◽  
Aqueous Corrosion ◽  
Backscatter Diffraction ◽  
Scanning Electron

The effect of predeformation on corrosion of ASTM A106B pipeline steel exposed to 1.7 mM sodium chloride droplets covered by simulated diluted bitumen was evaluated. The microstructures of ASTM A106B pipeline steel with and without predeformation were examined by electron backscatter diffraction and optical microscope. Corrosion of pipeline steel under the chloride droplet covered by simulated diluted bitumen for 5 min was studied with and without predeformation using scanning electron microscopy. Corrosion was initiated at the surface of ASTM A106B pipeline steel after 5 min of exposure. The predeformation increased the number of pits initiated at the steel surface and the number of partially dissolved inclusions. Scanning electron microscopy, profilometry, and x-ray photoelectron spectroscopy measurements were used to characterize the corrosion of the specimens with and without prior deformation after 24 h of exposure to an oil-covered droplet. The corrosion products coalesced and formed a small circular ring which deviated from the geometric center of the droplet. The diameters of the circular rings for the unbent and pre-bent specimens were 2.371±0.125 mm and 2.465±0.046 mm, respectively; the distances between the circular ring centers and droplet centers were 0.599±0.124 mm and 0.620±0.190 mm, respectively. The average corrosion penetration of the predeformed specimen was 1.18±0.09 times higher than that of the specimen without predeformation.

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).

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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