Saturated low frequency eddy current technique applied to phases characterization in duplex stainless steel

2013 ◽  
Author(s):  
J. M. A. Rebello ◽  
C. G. Camerni ◽  
M. C. Areiza ◽  
R. O. Carneval ◽  
R. W. F. Santos
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Low Frequency ◽  
Current Technique

Nondestructive Evaluation for Duplex Stainless Steel Tube Using Multi-Frequencies Remote Field Testing

2015 ◽  
Vol 659 ◽  
pp. 633-637
Author(s):  
Cherdpong Jomdecha ◽  
Isaratat Phung-On ◽  
Kasemsak Sritarathorn
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Field Testing ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Frequency Range ◽  
Testing Frequency ◽  
Wall Loss ◽  
Different Depths

This paper presents the determination of Remote Field Testing (RFT) frequencies to accomplish the inspection of duplex stainless steel tubes grade ASME/ASTM SA 789. The tube specimen was 25.4 mm of outside diameter, and thickness of 1.65 mm with the different artificial flaws. A dual-pickup coils type of RFT probe was employed to inspect the specimen by inserting a probe within the tube. Optimum of testing frequency Range was determined based on an eddy current through transmission generation to produce different magnetic field density. RFT inspection frequency range for duplex stainless steel was consequently determined from 5 to 25 kHz which was different than those inspection frequencies of general ferromagnetic steel tube. In the experiment, calculated frequencies were then generated to the Eddy current (ET) and RFT probes for detecting the flaws of the tube specimen. The inspection signals were specifically shown in function of impedance plane to identify the flaw characters. The results showed that the RFT can be utilized to quantify the wall loss levels of duplex stainless-steel tube better than the ET. Especially, phase angle of inspection signals can be used to evaluate the different depths of the wall losses. Sensitivity of RFT showed the detection performance at minimum 20% of tube wall loss.

Eddy current technique as a nondestructive method for evaluating the degree of sensitization of 304 stainless steel

2020 ◽  
Vol 173 ◽  
pp. 108742
Author(s):  
Yeganeh Kelidari ◽  
Mehrdad Kashefi ◽  
Mostafa Mirjalili ◽  
Mahla Seyedi ◽  
Thomas W. Krause
Keyword(s):  
Stainless Steel ◽  
Eddy Current ◽  
Nondestructive Method ◽  
304 Stainless Steel ◽  
Current Technique ◽  
Degree Of Sensitization

scholarly journals Eddy Current Transducer Dedicated for Sigma Phase Evaluation in Duplex Stainless Steel

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Grzegorz Psuj ◽  
Tomasz Chady ◽  
Cesar Giron Camerini
Keyword(s):  
Stainless Steel ◽  
Electrical Properties ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Sigma Phase ◽  
High Sensitivity ◽  
Current Transducer ◽  
Differential Type ◽  
Phase Evaluation ◽  
Eddy Current Transducer

The paper describes a new transducer dedicated for evaluation of a duplex stainless steel (DSS). Different phases which exist in DSS have influence on mechanical as well as on electrical properties. Therefore, an eddy current transducer was utilized. In order to achieve high sensitivity, a differential type of the transducer was selected. The performance of the transducer was verified by utilizing the samples which had a different amount of sigma phase.

Ultrasound, eddy current and magnetic Barkhausen noise as tools for sigma phase detection on a UNS S31803 duplex stainless steel

2010 ◽  
Vol 527 (12) ◽  
pp. 2886-2891 ◽  
Author(s):  
Paulo G. Normando ◽  
Elineudo P. Moura ◽  
José A. Souza ◽  
Sérgio S.M. Tavares ◽  
Linilson R. Padovese
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Sigma Phase ◽  
Barkhausen Noise ◽  
Phase Detection ◽  
Magnetic Barkhausen Noise

Eddy current techniques for super duplex stainless steel characterization

2015 ◽  
Vol 388 ◽  
pp. 96-100 ◽  
Author(s):  
C. Camerini ◽  
R. Sacramento ◽  
M.C. Areiza ◽  
A. Rocha ◽  
R. Santos ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Super Duplex Stainless Steel

The Sigma Phase Evaluation in Duplex Stainless Steel Using ECT Method

2012 ◽  
Vol 721 ◽  
pp. 65-70
Author(s):  
Cesar Giron Camerini ◽  
Grzegorz Psuj ◽  
Tomasz Chady ◽  
Joao Marcos Alcoforado Rebello
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Eddy Current ◽  
Sigma Phase ◽  
Current Method ◽  
Differential Mode ◽  
Eddy Current Method ◽  
Phase Evaluation

An eddy current method was applied to evaluate amount of sigma phase in duplex stainless steel. In the preliminary experiments several transducers configuration were considered. The performance of the transducers were verified utilizing samples having different amount of sigma phase. The configurations presenting the greatest possibility of evaluation of sigma phase were chosen for further experiments. In this paper a dedicated transducer operating in differential mode will be presented. The results will be shown and discussed.

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