A comparison of plasma and gaseous nitriding for tools in hot massive forming

2013 ◽  
Vol 7 (3) ◽  
pp. 133-139 ◽  
Author(s):  
S. Hoja ◽  
H. Klümper-Westkamp ◽  
F. Hoffmann ◽  
H-W. Zoch
Keyword(s):  
Gaseous Nitriding ◽  
Massive Forming

Masers as probes of the gas dynamics close to forming high-mass stars

2017 ◽  
Vol 13 (S336) ◽  
pp. 201-206 ◽  
Author(s):  
Luca Moscadelli ◽  
Alberto Sanna ◽  
Ciriaco Goddi
Keyword(s):  
Gas Dynamics ◽  
Very Long Baseline Interferometry ◽  
High Mass ◽  
Powerful Technique ◽  
Long Baseline ◽  
Vlbi Observations ◽  
Massive Forming ◽  
Typical Distances ◽  
New Generation ◽  
Better Than

AbstractImaging the inner few 1000 AU around massive forming stars, at typical distances of several kpc, requires angular resolutions of better than 0″.1. Very Long Baseline Interferometry (VLBI) observations of interstellar molecular masers probe scales as small as a few AU, whereas (new-generation) centimeter and millimeter interferometers allow us to map scales of the order of a few 100 AU. Combining these informations all together, it presently provides the most powerful technique to trace the complex gas motions in the proto-stellar environment. In this work, we review a few compelling examples of this technique and summarize our findings.

Unusual Microstructural Development upon Gaseous Nitriding of Fe-4.65at% Al Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 371-376
Author(s):  
S. Meka ◽  
R.E. Schacherl ◽  
E. Bischoff ◽  
Eric J. Mittemeijer
Keyword(s):  
Electron Backscatter Diffraction ◽  
Ferrite Matrix ◽  
Microstructural Development ◽  
Al Alloy ◽  
X Ray Diffraction ◽  
Gaseous Nitriding ◽  
Backscatter Diffraction ◽  
Micro Analysis ◽  
Very High ◽  
Plate Type

Employing NH3/H2 gas mixtures, Fe-4.65at% Al alloy specimens were nitrided to assess how the presence of Al, originally dissolved in the ferrite matrix, influences the development of γ-Fe4N1-x phase in the surface adjacent region. The nitrided specimens were characterized by light microscopy, X-ray diffraction, Electron Backscatter Diffraction and Electron Probe Micro Analysis. Surprisingly, formation of ε-Fe2N1-x was observed, although, for the applied nitriding parameters (nitriding potential and temperature), only the formation of γ-Fe4N1-x would be expected in case of nitriding pure ferrite. An unusual plate-type morphology of γ-Fe4N1-x was observed, contrasting with the usual continuous layer-type growth observed upon nitriding iron, Fe-Cr and Fe-V alloys. These unexpected phenomena may be explained as consequences of the need to realize a very high nitrogen supersaturation in the ferrite matrix in order to initiate the precipitation of AlN.

Anisotropy effects on gaseous nitriding of austenitic stainless steel single crystals

2020 ◽  
Vol 194 ◽  
pp. 168-177 ◽  
Author(s):  
Ömer C. Kücükyildiz ◽  
Flemming B. Grumsen ◽  
Thomas L. Christiansen ◽  
Grethe Winther ◽  
Marcel A.J. Somers
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Single Crystals ◽  
Gaseous Nitriding

S91 Phase Transformation Involving Residual Stresses During Gaseous Nitriding of Steel

2008 ◽  
Vol 23 (2) ◽  
pp. 190-190
Author(s):  
S. Jegou ◽  
R. Kubler ◽  
L. Barrallier ◽  
F. Roch
Keyword(s):  
Phase Transformation ◽  
Residual Stresses ◽  
Gaseous Nitriding

Behavior of DLC coatings in lubricant free cold massive forming of aluminum

2006 ◽  
Vol 201 (3-4) ◽  
pp. 822-827 ◽  
Author(s):  
Andreas Wank ◽  
Guido Reisel ◽  
Bernhard Wielage
Keyword(s):  
Dlc Coatings ◽  
Massive Forming
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