Microstructural Characterization of the expanded austenite formed on the plasma nitrided AISI 316 L steel

2013 ◽  
Vol 101 (2) ◽  
pp. 204 ◽  
Author(s):  
M. Keddam ◽  
G. Marcos ◽  
T. Thiriet ◽  
T. Czerwiec ◽  
H. Michel
Keyword(s):  
Microstructural Characterization ◽  
Expanded Austenite ◽  
Aisi 316 ◽  
Aisi 316 L

Effect of Cooling Rate on Mechanical and Microstructural Characterization of Friction Stir Welded 316 L Austenitic Stainless Steel Joints

2015 ◽  
Vol 830-831 ◽  
pp. 314-318 ◽  
Author(s):  
S. Shashi Kumar ◽  
N. Murugan ◽  
K.K. Ramachandran
Keyword(s):  
Stainless Steel ◽  
Microstructural Characterization ◽  
Secondary Phase ◽  
Weld Nugget ◽  
Friction Stir ◽  
316 L Stainless Steel ◽  
Gas Cooling ◽  
Aisi 316 ◽  
Steel Joints ◽  
Aisi 316 L

The present investigation is carried out to investigate on mechanical and metallurgical properties of Friction stir (FS) / Underwater Friction stir (UFS) welded 3 mm thick AISI 316 L stainless steel joints. Experiments were carried out at a tool rotational speed of 700 rpm, welding speed of 45 mm/min and axial force of 12 kN. Defect free joints were confirmed by visual inspection. A marginal rise of about 4.5 % increase in the joint strength is achieved in water cooling than by gas cooling technique. Reduced peak temperature in water cooled joint led to better grain refinement in the weld nugget enhancing FSW tool life. No sign of secondary phase precipitation was observed in the weld joints which was confirmed by Energy Dispersive Spectroscopy (EDS) spectrums and micro etchants like Groesbeck and modified Murakami reagents in the weld nugget.

scholarly journals Microstructural characterization of laser cladded AISI 316 stainless steel on a carbon steel substrate

2019 ◽  
Vol 44 (2) ◽  
pp. 1-5
Author(s):  
Tomaž Irgolič ◽  
David Potočnik ◽  
Mirko Ficko ◽  
Peter Kirbiš
Keyword(s):  
Stainless Steel ◽  
Steel Substrate ◽  
Microstructural Characterization ◽  
Processing Parameters ◽  
Columnar Grains ◽  
Aisi 316 Stainless Steel ◽  
Exact Shape ◽  
Aisi 316 ◽  
Net Shaping

Laser engineering net shaping (LENS) is a method of depositing metals into fully shaped parts or for the production of clad layers of noble or wear resistant metals on construction grade steels. In the current work stainless steel was deposited using different combinations of processing parameters such as speed, layer thickness and laser power. The resulting microstructures within the clad layers were then characterized using different etching techniques. Microstructures formed during the SLM process are comprised of columnar grains with a cellular, cellular/dendritic substructure. The exact shape of these grains is difficult to observe with the use of common etching techniques, this is especially true when considering thin cladded layers, with dissimilar etching behavior. For this purpose we compared a variety of different etchants, which attack the ferrite phase or produce a tint effect. Special attention was giving to the delineation of the columnar grains, which under certain processing parameters can exceed the thickness of individual deposited layers.

Chemical and mechanical characterization of TiO2/Al2O3 atomic layer depositions on AISI 316 L stainless steel

2012 ◽  
Vol 211 ◽  
pp. 84-88 ◽  
Author(s):  
E. Marin ◽  
A. Lanzutti ◽  
M. Lekka ◽  
L. Guzman ◽  
W. Ensinger ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Mechanical Characterization ◽  
Atomic Layer ◽  
316 L Stainless Steel ◽  
Aisi 316 ◽  
Aisi 316 L

scholarly journals Characterization of the expanded austenite developed on AISI 316 LM steel by plasma nitriding

2017 ◽  
Vol 53 (1) ◽  
pp. 47-52 ◽  
Author(s):  
M. Keddam ◽  
T. Thiriet ◽  
G. Marcos ◽  
T. Czerwiec
Keyword(s):  
Optical Emission Spectroscopy ◽  
Plasma Nitriding ◽  
Optical Emission ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Stresses ◽  
Expanded Austenite ◽  
Aisi 316 ◽  
Kinetics Of

AISI 316 LM samples were plasma nitrided at a temperature of 380?C for different times between 0.5 and 8 h in a 85%N2- 15%H2 gas mixture. Different experimental techniques such as: optical microscopy (OM), X- ray diffraction (XRD ) and glow discharge optical emission spectroscopy (GDOES) were used to characterize the expanded austenite layer formed at the surface of AISI 316 LM stainless steel. The microscopical observations revealed the presence of the expanded austenite with a mean layer thickness between 1.90 and 4.31 ?m. The growth kinetics of expanded austenite was also investigated. In addition, both the compressive stresses in the expanded austenite layer and the compositional strains were estimated by means of a simple mechanical model based on the XRD results.

Microstructural characterization of CoPtCr/Cr thin film disks by cross-section TEM and elongated probe micro-diffraction

1991 ◽  
Vol 49 ◽  
pp. 762-763
Author(s):  
M.A. Parker ◽  
K.E. Johnson ◽  
C. Hwang ◽  
A. Bermea
Keyword(s):  
Magnetic Recording ◽  
Electron Probe ◽  
Microstructural Characterization ◽  
Crystallographic Structure ◽  
Recording Media ◽  
Layer By Layer ◽  
Cross Sectional ◽  
New Techniques ◽  
Polished Side

We have reported the dependence of the magnetic and recording properties of CoPtCr recording media on the thickness of the Cr underlayer. It was inferred from XRD data that grain-to-grain epitaxy of the Cr with the CoPtCr was responsible for the interaction observed between these layers. However, no cross-sectional TEM (XTEM) work was performed to confirm this inference. In this paper, we report the application of new techniques for preparing XTEM specimens from actual magnetic recording disks, and for layer-by-layer micro-diffraction with an electron probe elongated parallel to the surface of the deposited structure which elucidate the effect of the crystallographic structure of the Cr on that of the CoPtCr.XTEM specimens were prepared from magnetic recording disks by modifying a technique used to prepare semiconductor specimens. After 3mm disks were prepared per the standard XTEM procedure, these disks were then lapped using a tripod polishing device. A grid with a single 1mmx2mm hole was then glued with M-bond 610 to the polished side of the disk.

Microstructural Characterization of Au-Ge-Ni based ohmic contacts to GaAs/AlGaAs modfet device

1987 ◽  
Vol 45 ◽  
pp. 326-327
Author(s):  
A.K. Rai ◽  
A.K. Petford-Long ◽  
A. Ezis ◽  
D.W. Langer
Keyword(s):  
Contact Resistance ◽  
Ohmic Contact ◽  
Ohmic Contacts ◽  
Microstructural Characterization ◽  
Almost Everywhere ◽  
Spacer Layer ◽  
Good Contact ◽  
The Relationship ◽  
Lower Contact

Considerable amount of work has been done in studying the relationship between the contact resistance and the microstructure of the Au-Ge-Ni based ohmic contacts to n-GaAs. It has been found that the lower contact resistivity is due to the presence of Ge rich and Au free regions (good contact area) in contact with GaAs. Thus in order to obtain an ohmic contact with lower contact resistance one should obtain a uniformly alloyed region of good contact areas almost everywhere. This can possibly be accomplished by utilizing various alloying schemes. In this work microstructural characterization, employing TEM techniques, of the sequentially deposited Au-Ge-Ni based ohmic contact to the MODFET device is presented.The substrate used in the present work consists of 1 μm thick buffer layer of GaAs grown on a semi-insulating GaAs substrate followed by a 25 Å spacer layer of undoped AlGaAs.

Microstructural characterization of a cast RENi5-based alloy

1993 ◽  
Vol 51 ◽  
pp. 1176-1177
Author(s):  
G. M. Micha ◽  
L. Zhang
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Microstructural Characterization ◽  
Binary Compound ◽  
Nickel Metal ◽  
Cast Material ◽  
Nickel Metal Hydride ◽  
Transmission Electron ◽  
Cast Condition

RENi5 (RE: rare earth) based alloys have been extensively evaluated for use as an electrode material for nickel-metal hydride batteries. A variety of alloys have been developed from the prototype intermetallic compound LaNi5. The use of mischmetal as a source of rare earth combined with transition metal and Al substitutions for Ni has caused the evolution of the alloy from a binary compound to one containing eight or more elements. This study evaluated the microstructural features of a complex commercial RENi5 based alloy using scanning and transmission electron microscopy.The alloy was evaluated in the as-cast condition. Its chemistry in at. pct. determined by bulk techniques was 12.1 La, 3.2 Ce, 1.5 Pr, 4.9 Nd, 50.2 Ni, 10.4 Co, 5.3 Mn and 2.0 Al. The as-cast material was of low strength, very brittle and contained a multitude of internal cracks. TEM foils could only be prepared by first embedding pieces of the alloy in epoxy.

Microstructural Characterization of Open-Pore Metal Foams of Pure Metals

2015 ◽  
Vol 52 (2) ◽  
pp. 83-107 ◽  
Author(s):  
B. S. Mocker ◽  
A. M. Matz ◽  
N. Jost ◽  
P. Krug
Keyword(s):  
Microstructural Characterization ◽  
Metal Foams ◽  
Pure Metals
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