scholarly journals Effect of Trace Mg on Impact Toughness of 2.25Cr1Mo Steel Doped with 0.056% P at Medium Temperature Aging Process

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 10
Author(s):  
Xin Dong ◽  
Xiaobing Li ◽  
Weiwei Xing ◽  
Leilei Ding ◽  
Yingche Ma ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Impact Toughness ◽  
Grain Boundary ◽  
Aging Process ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Vacuum Induction Furnace ◽  
Medium Temperature ◽  
Mg Addition ◽  
The Impact

In order to investigate the effect of Mg addition on the embrittlement of Cr-Mo steels, the 2.25Cr1Mo steel plates containing Mg, P contents were refined with vacuum induction furnace and rolled with double-stick reversible rolling mill. The impact toughness evolution and microstructural characteristics of these steels after aging at 580 °C for up to 5000 h were systematically investigated. The grain boundary segregation behaviors of P, S, and Mg before and after aging were analyzed with auger electron spectroscopy (AES), and the microstructure characteristics of the steels were detected with optical electron microscope (OM) and transmission electron microscope (TEM). The research results show Mg addition can improve the impact toughness of the 2.25Cr1Mo steel to a certain extent even with 0.056 wt.% P doping. It was clarified that Mg can segregate to grain boundary during the aging process, and its strong segregation tendency can reduce the grain boundary segregation of P to some degree. The effects of Mg on the impact toughness after subjecting to 580 °C ageing, including element segregation behaviors at grain boundary, ferrite formation, prior austenite grain characteristics, and carbides at grain boundary were also identified and discussed.

The Effect of Coherent Bremsstrahlung Peaks in AEM Studies of Grain Boundary Segregation

1985 ◽  
Vol 43 ◽  
pp. 248-249
Author(s):  
K. S. Vecchio
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
X Ray ◽  
Interaction Volume ◽  
Peak Intensity ◽  
Coherent Bremsstrahlung ◽  
Analytical Electron ◽  
Analytical Electron Microscope

Recently coherent bremsstrahlung (CB) peaks have been detected in x-ray spectra in the analytical electron microscope (AEM). It has been suggested that CB peaks, which are Gaussian, may either mask, or be misinterpreted as elemental peaks in x-ray spectra. A method for identifying and isolating these peaks has been presented, The problem of CB peaks is particularly severe in AEM grain boundary segregation studies, because the amount of segregant in the interaction volume is small (<∼3 wt%), the x-ray counting times are long, and as a result the CB peak intensities can approximate to the expected segregant peak intensity. The misleading effects of CB can be either to produce pseudo-element peaks close to true element peak positions, or to overestimate the true element peak intensity when the CB peaks are superimposed on the x-ray peak of the segregant. This article reports an investigation of the effects of CB on segregation studies in Cu and Fe.

scholarly journals Quantification of Grain Boundary Segregation Monolayers by X-ray Spectroscopy in a Scanning Electron Microscope

2011 ◽  
Vol 17 (S2) ◽  
pp. 602-603 ◽  
Author(s):  
P Nowakowski ◽  
F Christien ◽  
M Allart ◽  
Y Borjon-Piron ◽  
R Le Gall ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
X Ray ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Grain boundary segregation in metals

1992 ◽  
Vol 50 (2) ◽  
pp. 1204-1205
Author(s):  
C.L. Briant
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Material Properties ◽  
Electron Spectroscopy ◽  
High Vacuum ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Local Concentration ◽  
The One

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.

An atom probe tomography study of grain boundary segregation in nanocrystalline Ni-W

2005 ◽  
Vol 903 ◽  
Author(s):  
Andrew Detor ◽  
Michael K. Miller ◽  
Christopher A. Schuh
Keyword(s):  
Grain Boundary ◽  
Atom Probe Tomography ◽  
Boundary Segregation ◽  
Atom Probe ◽  
Solute Segregation ◽  
Grain Boundary Segregation ◽  
Distribution Analysis ◽  
Grain Sizes ◽  
Composition Fluctuations ◽  
20 Nm

AbstractAtom probe tomography is used to observe the solute distribution in electrodeposited nanocrystalline Ni-W alloys with three different grain sizes (3, 10, and 20 nm) and the results are compared with atomistic computer simulations. The presence of grain boundary segregation is confirmed by detailed analysis of composition fluctuations in both experimental and simulated structures, and its extent quantified by a frequency distribution analysis. In contrast to other nanocrystalline alloys, the present Ni-W alloys exhibit only a subtle amount of solute segregation to the intergranular regions. This finding is consistent with quantitative predictions for these alloys based upon a thermodynamic model of grain boundary segregation.

scholarly journals Grain Boundary Segregation in UFG Alloys Processed by Severe Plastic Deformation

2012 ◽  
Vol 14 (11) ◽  
pp. 968-974 ◽  
Author(s):  
Xavier Sauvage ◽  
Artur Ganeev ◽  
Yulia Ivanisenko ◽  
Nariman Enikeev ◽  
Maxim Murashkin ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Grain Boundary ◽  
Severe Plastic Deformation ◽  
Boundary Segregation ◽  
Grain Boundary Segregation

Boron Grain Boundary Segregation in a Heat Treatable Steel

2015 ◽  
Vol 160 (5) ◽  
pp. 204-208 ◽  
Author(s):  
Phillip Haslberger ◽  
Christoph Turk ◽  
Katharina Babinsky ◽  
Devrim Caliskanoglu ◽  
Helmut Clemens ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation
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