SQUID NDE Apparatus and Magnetic Calibration to Detect Degradation in Duplex Stainless Steel

1992 ◽  
Vol 114 (1) ◽  
pp. 41-45 ◽  
Author(s):  
S. Evanson ◽  
M. Otaka ◽  
K. Hasegawa
Keyword(s):  
Magnetic Material ◽  
Stainless Steel ◽  
Magnetic Permeability ◽  
Material Characterization ◽  
Residual Magnetization ◽  
Duplex Steel ◽  
Wide Range ◽  
Remote Measurements ◽  
Steel Grades

We report on apparatus for the magnetic material characterization of a wide range of steel grades of high and low magnetic permeability. The instrument has been used to detect thermal aging in Duplex steel by the measurement of the residual magnetization (Br) of test specimens. A method to estimate the value of Br by remote measurements up to 200 mm from a specimen is described. The results are compared with data from conventional hysteresis loop measurements.

Holistic Characterization of Carbon Nanotube Membrane for Capacitive Deionization Electrodes Application

2015 ◽  
Vol 1752 ◽  
pp. 125-130 ◽  
Author(s):  
Yamila M. Omar ◽  
Carlo Maragliano ◽  
Chia-Yun Lai ◽  
Francesco Lo Iacono ◽  
Nicolas Bologna ◽  
...  
Keyword(s):  
Thin Film ◽  
Material Characterization ◽  
Capacitive Deionization ◽  
Carbon Nanostructure ◽  
Rate Dependent ◽  
Wide Range ◽  
Materials Used ◽  
Multiwall Carbon ◽  
Mechanical Surface

ABSTRACTOne of the main areas of improvement in capacitive deionization technologies is the materials used for electrodes which have very specific requirements. In the present work, a wide range of material characterization techniques are employed to determine the suitability of a multiwall carbon nanostructure thin film as electrode material. The electrical, mechanical, surface and wetting characteristics are studied proving the membrane highly conductive (σ=7.25 103 S/m), having competitive electro-sorption capacity (11.7 F/g at 10 mV/s) and surface area (149 m2/g), strain rate dependent mechanical properties and hydrophobic wetting behavior.

Microstructural Characterization of Layers Produced by Plasma Nitriding on Austenitic and Superaustenitic Stainless Steel Grades

2012 ◽  
Vol 9 (2) ◽  
pp. 103564
Author(s):  
S. W. Dean ◽  
George E. Totten ◽  
Luiz C. Casteletti ◽  
Frederico A. P. Fernandes ◽  
Juno Gallego
Keyword(s):  
Stainless Steel ◽  
Plasma Nitriding ◽  
Microstructural Characterization ◽  
Superaustenitic Stainless Steel ◽  
Steel Grades

scholarly journals An Inverse Approach for Magnetic Material Characterization of an EI Core Electromagnetic Inductor

2010 ◽  
Vol 46 (2) ◽  
pp. 622-625 ◽  
Author(s):  
Ahmed Abou-Elyazied Abdallh ◽  
Peter Sergeant ◽  
Guillaume Crevecoeur ◽  
Luc Dupre
Keyword(s):  
Magnetic Material ◽  
Material Characterization ◽  
Inverse Approach

Microstructural Magnetic Characterization of Annealed Non-Oriented Electrical Steel

2018 ◽  
Vol 915 ◽  
pp. 190-195
Author(s):  
Evangelos Hristoforou ◽  
Athanasios G. Mamalis
Keyword(s):  
Magnetic Properties ◽  
Magnetic Permeability ◽  
Electrical Steel ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Magnetic Characterization ◽  
Microstructural Changes ◽  
Wide Range ◽  
Nondestructive Characterization

The present paper investigates the utilization of the magnetic Barkhausen noise and magnetic permeability methods for the nondestructive characterization of annealed non-oriented electrical steel samples which were isothermally annealed in a wide range of temperatures (400°C – 950°C) and subsequently cooled in air. The resulting magnetic properties were compared with the microstructural changes occurring during annealing.

A Comparative Study on the Oxidation of Fe-25Cr-7Ni-4Mo and Fe-25Cr-7Ni-2Mo-4W Steels

2014 ◽  
Vol 620 ◽  
pp. 453-456
Author(s):  
Shun Myung Shin ◽  
Jei Pil Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Comparative Study ◽  
Oxide Layer ◽  
Alloy Composition ◽  
Ion Diffusion ◽  
Wide Range ◽  
Steel Grades ◽  
Corrosive Environments

Stainless steel materials (FeCr and FeCrNi-based alloys) are employed in a wide range of modern applications due to their ability to withstand corrosive environments while maintaining good mechanical properties. Their corrosion resistance originates from Cr-rich oxide layer which serves as a barrier against ion diffusion between the alloy and the ambient phase. Custom steel grades can be designed for specific applications by optimizing their properties throughout alloy composition [1].

scholarly journals Evaluation of the Magnetic Permeability for the Microstructural Characterization of a Duplex Stainless Steel

2014 ◽  
Vol 44 (3) ◽  
pp. 20130313 ◽  
Author(s):  
Edgard de Macedo Silva ◽  
Josinaldo P. Leite ◽  
Francisco A. de França Neto ◽  
João P. Leite ◽  
Walter M. L. Fialho ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Magnetic Permeability ◽  
Microstructural Characterization

scholarly journals Thermomechanical fatigue behaviour of ferritic stainless steel grades for high temperatures applications

2018 ◽  
Vol 165 ◽  
pp. 16003
Author(s):  
Cloé Prudhomme ◽  
Pierre-Olivier Santacreu ◽  
Isabelle Evenepoel ◽  
Benoit Proult
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
High Temperatures ◽  
Thermal Loading ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Thermomechanical Fatigue ◽  
Compression Tests ◽  
Wide Range ◽  
Steel Grades

Nowadays high temperatures resistant materials are needed to resist to high temperature applications (up to 1000°C), such as automotive exhaust gas manifolds. Some developed stainless steel grades, including ferritic grades or austenitic refractory grades, can be used in this temperature range and both in continuous or cyclic thermal conditions. In order to predict the thermomechanical fatigue damage of stainless steel parts submitted to cyclic thermal loading and constrained bonding conditions, the elastoviscoplastic model by Chaboche is determined for a wide range of temperatures, of strain amplitudes and strain rate levels thanks to isothermal traction-compression tests. The validation procedure is performed afterward by comparison with stabilized behavior under non isothermal conditions on a dedicated thermal fatigue test performed on V-shape specimens. Results of simulation show very good fitting with the experimental curves which would lead to a more accurate fatigue life prediction. A damage model was derived from Taira’s thermal low-cycle fatigue model to include dwell-time period at high temperature and creep-oxidation effect. In this paper the example of K44X, a dedicated grade for high temperatures applications, is presented.

New frontiers in infrared microspectroscopy

1992 ◽  
Vol 50 (2) ◽  
pp. 1522-1523
Author(s):  
M. A. Harthcock ◽  
M. L. McKelvy ◽  
R. J. Pell
Keyword(s):  
Spatial Resolution ◽  
Material Characterization ◽  
Functional Group ◽  
Analysis Techniques ◽  
Infrared Microspectroscopy ◽  
System Composition ◽  
Wide Range ◽  
Common Technique ◽  
Experimental Technology

Infrared microspectroscopy has become a common technique for the microanalysis of material. Characterization of spatially specific areas using infrared spectroscopy has been applied to a wide range of materials/systems including, for example, multi-layer films, silicon wafer contamination and inclusions in a variety of systems, surface contamination, orientation in single fibers. In addition, infrared microspectroscopy mapping experiments have been used to obtain images of materials based on functional group absorptions that characterize system composition.The spatial resolution of the technique is limited to approximately 10-20 micrometers experimentally, due to diffraction limitations. Infrared ultra-microspectroscopy has been mentioned by Messerschmidt as a technique to achieve resolution below the diffraction limit of the radiation (e.g. 5 micrometers). However, in the absence of experimental technology to routinely increase the spatial resolution from which unique infrared spectra can be obtained, we have applied factor analysis techniques to effectively increase the spatial resolution from which an infrared spectrum could be obtained.

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