Design of P92 Steel Thermal Aging Testing Instrument Based on Magnetic Barkhausen Effect
Aiming at the detection of the thermal aging degree of P92 steel for boilers and main steam pipes in thermal power plants in service,a set of detection instruments based on the MBN effect is developed with the HDSP-SUPER 28335 development board as the core.The instrument has the functions of excitation signal gen-eration,MBN signal acquisition,processing,display,and storage,and is sensitive and comprehensive enough to be used for experimental research.According to the different sensitivity of different steel grades to the excitation signal,the experimental study of the applicable excitation signal for MBN detection of standard P92 steel is car-ried out,the amplitude of the excitation signal is determined according to the relationship between the ampli-tude of the excitation signal and the variation of the root mean square value of the MBN signal,and the fre-quency of the excitation signal is selected according to the waveform effect of the MBN signal generated by dif-ferent excitation signal frequencies.
magnetic Barkhausen effectthermal power plantsP92 steelthermal ageingexcitation signal
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