Metallographic and Eddy Current Study of Boride Strengthening Coatings

2021 ◽  
Vol 887 ◽  
pp. 351-357
Author(s):  
Vladimir N. Malikov ◽  
Alexey V. Ishkov
Keyword(s):  
Electrical Conductivity ◽  
Data Analysis ◽  
Eddy Current ◽  
Steel Surface ◽  
Measuring System ◽  
Quantitative Composition ◽  
Heating Method ◽  
Conductivity Distribution ◽  
Test Materials ◽  
Course Of Study

This research aims to study boron-based coatings on the surface of steel parts. The significance of this topic is determined by practical considerations of the need to improve strength of the steel surface subjected to high loads. In the course of study, samples of strengthening coatings made of 65G steel obtained by HFEC heating method were created. Then, the samples were subjected to a series of studies using a metallographic microscope, as well as a measuring system based on eddy current effects. The obtained data analysis allows us to conclude about the pattern of electrical conductivity distribution on the surface of test materials with different coatings depending on the quantitative composition of flux when creating boron-based strengthening coatings.

A Novel Heating Method of the PET Film by the Eddy Current

2015 ◽  
Vol 135 (9) ◽  
pp. 557-558
Author(s):  
Masao Ishinabe ◽  
Naoto Maeoka ◽  
Masunori Kawamura
Keyword(s):  
Eddy Current ◽  
Heating Method ◽  
Pet Film

Localization and Recognition of Different Vertebra Tissues Based on Eddy Current Detection Method

2013 ◽  
Vol 740 ◽  
pp. 128-133 ◽  
Author(s):  
Wei Wen Liu ◽  
Kai Jiang ◽  
Hui Zhao ◽  
Cheng Long Wang
Keyword(s):  
Electrical Conductivity ◽  
Internal Fixation ◽  
Eddy Current ◽  
Biological Tissue ◽  
Detection Method ◽  
Pedicle Screws ◽  
Human Beings ◽  
High Penetration ◽  
Trauma Injury ◽  
Current Detection

The spine, which is throughout the trunk, is of great importance to the skeleton structure of human beings. For spine is vulnerable, the rate of spine incident trauma injury is relatively high. In the contemporary technology, the internal fixation prosthetics with implanting pedicle screws is the most efficient way in clinical treatment. However spine internal fixation surgery has many disadvantages like complex in the operation, the high penetration rate and inability to be used in the field battle. As a result, according to the magnetic property difference of different vertebra tissues, an eddy current detection method which is used in localization and recognition of different vertebra tissues to realize the navigation of spine internal fixation surgery is proposed in this paper. A set of improved series-reverse-three coils eddy current sensor is used to test the NaCl solution which electrical conductivity matches that of biological tissue. And the result of several experiments indicates this method can detect the biological tissue with the electrical conductivity no less than 0.5 S/m, which lays a solid foundation to further study of recognition different vertebra tissues.

scholarly journals Image Analysis of Eccentric Photorefraction

10.14311/546 ◽  
2004 ◽  
Vol 44 (2) ◽  
Author(s):  
J. Dušek ◽  
M. Dostálek
Keyword(s):  
Image Analysis ◽  
Data Analysis ◽  
Eye Movement ◽  
Measuring System ◽  
Video Sequences ◽  
Measuring Methods ◽  
Special System ◽  
Whole Process

This article deals with image and data analysis of the recorded video-sequences of strabistic infants. It describes a unique noninvasive measuring system based on two measuring methods (position of I. Purkynje image with relation to the centre of the lens and eccentric photorefraction) for infants. The whole process is divided into three steps. The aim of the first step is to obtain video sequences on our special system (Eye Movement Analyser). Image analysis of the recorded sequences is performed in order to obtain curves of basic eye reactions (accommodation and convergence). The last step is to calibrate of these curves to corresponding units (diopter and degrees of movement).

Non-Destructive Evaluation of Creep Damage in a Nickel Base Super-Alloy Turbine Bucket

2009 ◽  
Author(s):  
Hector Carreon
Keyword(s):  
Electrical Conductivity ◽  
Eddy Current ◽  
Elevated Temperatures ◽  
Damage Zone ◽  
Creep Damage ◽  
Turbine Engine ◽  
Turbine Component ◽  
Nickel Base ◽  
Turbine Bucket ◽  
Super Alloy

Due to elevated temperatures, excessive stresses and severed corrosion conditions, turbine engine components are subject to creep processes that limit the components life such as a turbine bucket. The failure mechanism of a turbine bucket is related primarily to creep and corrosion and secondarily to thermal fatigue. As a result, it is desirable to assess the current condition of such turbine component. This study uses the eddy current (EC) nondestructive evaluation technique in an effort to monitor the creep damage in a nickel base super-alloy, 7FA stage 2 turbine bucket after service. The experimental results show significative electrical conductivity variations in eddy current images on the creep damage zone of nickel base super-alloy samples cut from a turbine bucket. Thermoelectric power (TEP) measurements were also conducted in order to obtain a direct correlation between the presence of material changes due to creep damage and the electrical conductivity measurements.

scholarly journals Research on the welded seams of aluminum alloys using super-miniature eddy current transducers

2018 ◽  
Vol 212 ◽  
pp. 01001
Author(s):  
Sergey Dmitriev ◽  
Vladimir Malikov ◽  
Anatoly Sagalakov
Keyword(s):  
Eddy Current ◽  
Cutoff Frequency ◽  
Technical Information ◽  
Measurement Procedure ◽  
Measuring System ◽  
Friction Stir ◽  
Current Converter ◽  
Transformer Type ◽  
Aluminum Plates ◽  
Welded Seam

Based on the eddy current transducer of the transformer type, a measuring system has been developed that makes it possible to investigate the welded joints obtained by friction stir welding (FSW). The main technical information about the eddy current converter being used is given, and a measurement procedure is described that allows to search for defects in welded seams of aluminum plates. The device allows to automatically change the main operating frequency of the device and the cutoff frequency of the filtration system. The experiments were carried out on aluminum-magnesium alloy plates being connected by friction welding. In the article, the results of measurements are presented, allowing to estimate the quality of a welded seam and to answer a question on reliability of welding.

Correlation of Electrical Conductivity and Thermal Properties of Native Starch during Ohmic Heating

2011 ◽  
Vol 7 (5) ◽  
Author(s):  
Lam-Lam Wong ◽  
Yong-Wei Xu ◽  
Zhan-Hui Lu ◽  
Li-Te Li
Keyword(s):  
Electrical Conductivity ◽  
Room Temperature ◽  
Ohmic Heating ◽  
Heating Process ◽  
Rapid Evaluation ◽  
Scanning Calorimetry ◽  
Heating Method ◽  
Starch Gelatinization ◽  
On Line ◽  
Water Ratio

Electrical conductivity of starch suspension during ohmic heating was applied to analyze the starch gelatinization process. Native starches from wheat, corn, rice, potato, sweet potato, and pea were prepared on a starch to water ratio of 1:3 (w/w) with adding 0.05 M potassium chloride. A laboratory scale ohmic heating setup was designed to heat the starch suspension from room temperature to 90°C at a controlled heating rate of 10°C/min operating at 50 Hz and 110 V. The results show that starch gelatinization temperatures could be precisely calculated from electrical conductivity of starch suspension during ohmic heating process. The starch gelatinization temperatures based on ohmic heating were comparable to those measured by differential scanning calorimetry (DSC). Highly significant correlation of onset temperature (R=0.9972) and peak temperature (R=0.9950) were observed. The ohmic heating method could provide an alternative way to DSC with a promising potential for on-line and rapid evaluation of starch gelatinization temperatures.

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