Reflection of a Gaussian ultrasonic beam from Al2O3 layer–stainless steel in water at the Rayleigh angle

1978 ◽  
Vol 49 (4) ◽  
pp. 2576 ◽  
Author(s):  
Laszlo Adler ◽  
D. A. McCathern
Keyword(s):  
Stainless Steel ◽  
Ultrasonic Beam ◽  
Al2o3 Layer ◽  
Rayleigh Angle

Fabrication of Microchanneled Reformer for Portable Fuel Cell

2006 ◽  
Author(s):  
S. P. Yu ◽  
S. D. Yim ◽  
S. Um ◽  
W. Y. Lee ◽  
C. S. Kim
Keyword(s):  
Stainless Steel ◽  
Fuel Cell ◽  
Aluminum Foil ◽  
Proton Exchange ◽  
Al2o3 Layer ◽  
Stainless Steel Foil ◽  
Reforming Catalysts ◽  
Micro Channels ◽  
Solgel Method ◽  
Layer Coating

Miniature PEFC (Proton Exchange Fuel Cell) needs to be supplied with hydrogen of relatively highly purity to produce electricity. Each microstructured metal (stainless steel and aluminum) foil for the purpose of micro reformer was brazed in vacuum for stacking. Inner surfaces of micro channels were coated with Al2O3 layer to support reforming catalysts by solgel method/sputtering (for stainless steel) and anodizing (for aluminum). Stainless steel foil was good to etch and braze, but oxide layer coating on the surface of foil was too difficult to maintain uniformity to induce stable catalytic reaction. On the other hand, aluminum foil was good to control oxide film on the surface and bonded for stacking at low temperature which can avoid catalyst degradation.

Rayleigh angle backscattering of ultrasonic beam from single crystal nickel in 111 and 110 planes

1985 ◽  
Vol 77 (5) ◽  
pp. 1950-1953 ◽  
Author(s):  
Laszlo Adler ◽  
Shaio‐Wen Wang ◽  
Ken Bolland ◽  
Michel de Billy ◽  
Gerard Quentin
Keyword(s):  
Single Crystal ◽  
Ultrasonic Beam ◽  
Rayleigh Angle

VISUALIZATION OF ULTRASONIC-BEAM DISTORTION IN ANISOTROPIC STAINLESS STEEL

1985 ◽  
Vol 46 (C10) ◽  
pp. C10-795-C10-799 ◽  
Author(s):  
T. N. CLAYTOR ◽  
D. S. KUPPERMAN ◽  
K. J. REIMANN
Keyword(s):  
Stainless Steel ◽  
Ultrasonic Beam

scholarly journals Combined experiment and first-principles study of the formation of the Al2O3 layer in alumina-forming austenitic stainless steel

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 15727-15734 ◽  
Author(s):  
Nan Dong ◽  
Yongfeng Qiao ◽  
Caili Zhang ◽  
Jian Wang ◽  
Guangwei Fan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Oxide Layer ◽  
First Principles ◽  
Multilayer Structure ◽  
Al2o3 Layer ◽  
First Principles Study ◽  
The Matrix

Combined experiment and DFT research on the formation of the Al2O3 layer in AFA stainless steel is presented. The oxide layer has the multilayer structure with outer Cr2O3 and inner Al2O3 due to the diffusion of Al from the matrix to the Cr2O3 slab.

scholarly journals A Dense Cr2O3/Al2O3 Composite Ceramic Coating Prepared by Electrodeposition and Sealing with Al2O3

Coatings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 14 ◽  
Author(s):  
Jiao Di ◽  
Wei Liu ◽  
Lihong Xue ◽  
Qilai Zhou ◽  
Youwei Yan
Keyword(s):  
Stainless Steel ◽  
Bonding Strength ◽  
Ceramic Coating ◽  
Composite Ceramic ◽  
Structure And Properties ◽  
Al2o3 Layer ◽  
Al2o3 Composite ◽  
Heat Treated ◽  
High Microhardness ◽  
Composition Structure

A dense Cr2O3/Al2O3 composite coating was fabricated on 321L stainless steel by electrodepositing an Al2O3 layer on a Cr2O3 coating. The composition, structure, and properties of the obtained ceramic coating were investigated. The results showed that Al2O3 fully infiltrated the Cr2O3 coating and significantly improved the compactness of the ceramic coating by filling in the pores and cracks between the Cr2O3 grains. The composite ceramic coating was heat-treated at 750 °C and exhibited a high microhardness of 219.4 HV500g, a bonding strength of 46.5 MPa, and excellent anti-corrosion and deuterium permeation suppression properties.

An Ultrasonic Phased Array Evaluation of Cast Austenitic Stainless Steel Pressurizer Surge Line Piping Welds

2010 ◽  
Author(s):  
Aaron A. Diaz ◽  
Anthony D. Cinson ◽  
Susan L. Crawford ◽  
Traci L. Moran ◽  
Michael T. Anderson
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultrasonic Testing ◽  
Phased Array ◽  
Fatigue Cracks ◽  
Ultrasonic Beam ◽  
Custom Made ◽  
Ultrasonic Phased Array ◽  
Surge Line ◽  
Thermal Fatigue Cracks

A set of circumferentially oriented thermal fatigue cracks (TFCs) were implanted into three cast austenitic stainless steel (CASS) pressurizer (PZR) surge-line specimens (pipe-to-elbow welds) that were fabricated using vintage CASS materials formed in the 1970s, and flaw responses from these cracks were used to evaluate detection and sizing performance of the phased-array (PA) ultrasonic testing (UT) methods applied. Four different custom-made PA probes were employed in this study, operating nominally at 800 kHz, 1.0 MHz, 1.5 MHz, and 2.0 MHz center frequencies. The CASS PZR surge-line specimens were polished and chemically etched to bring out the microstructures of both pipe and elbow segments. Additional studies were conducted and documented to address baseline CASS material noise and observe possible ultrasonic beam redirection phenomena.

NiAl precipitation in Fe-12w/o Cr-5w/o Ni-4w/o Al

1983 ◽  
Vol 41 ◽  
pp. 202-203
Author(s):  
L.E. Murr ◽  
J.S. Dunning ◽  
S. Shankar
Keyword(s):  
Solid Solution ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Alloy Composition ◽  
Chromium Content ◽  
Scale Up ◽  
Optical Metallography ◽  
Property Evaluation ◽  
310 Stainless Steel ◽  
Microstructural Studies

Aluminum additions to conventional 18Cr-8Ni austenitic stainless steel compositions impart excellent resistance to high sulfur environments. However, problems are typically encountered with aluminum additions above about 1% due to embrittlement caused by aluminum in solid solution and the precipitation of NiAl. Consequently, little use has been made of aluminum alloy additions to stainless steels for use in sulfur or H2S environments in the chemical industry, energy conversion or generation, and mineral processing, for example.A research program at the Albany Research Center has concentrated on the development of a wrought alloy composition with as low a chromium content as possible, with the idea of developing a low-chromium substitute for 310 stainless steel (25Cr-20Ni) which is often used in high-sulfur environments. On the basis of workability and microstructural studies involving optical metallography on 100g button ingots soaked at 700°C and air-cooled, a low-alloy composition Fe-12Cr-5Ni-4Al (in wt %) was selected for scale up and property evaluation.

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