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1 Development and pplication of Ultrasonic Noise B-scan nalysis ( I-CLT ) Creep Damage ssessment for Fossil-Fuel Boiler Piping precise creep damage assessment method has been required for boiler plants using fossil fuel. This paper proposes a nondestructive testing for creep damage detection of piping of boilers by an ultrasonic testing method for the damage assessment. It was estimated as the following procedure. Ultrasonic signals were used by transforming to signals in the frequency domain by Fourier transform, and a specific frequency band was chosen. To determine the creep damage, the spectrum intensities were calculated. Calculated intensities had good correlation to life consumption of the weld joints, which permitted the method to predict the remaining life of pipes of boilers in service. Vol.47 No.4 ( )

2 1 P s µ 2 2-( b ) P s ( a ) ( b ) FFT FFT 1 Fig. 1Schematic image of scattering inside materials Vol.47 No.4 ( )

3 ( a ) 1 Table 1Chemical component of base and filler metals C Si Mn Ni V Nb 0.08 Cr 8.45 Mo 0.99 ( b ) P s 2 I-CLT Fig. 2Outline of measurement by I-CLT ( b ) P s P s 3 - ( c ) 3 - ( b ) ( a ) ( c )( b ) ( b ) P s µ 3 Fig. 3Results for aborted specimen ( 650ºC, 58.8 MPa, h ) Vol.47 No.4 ( )

4 4 - ( c )4 - ( d ) P s 4 - ( f ) 5- ( a ) - ( b ) - ( c ) ( a ) ( d )1 180 h mm B ( b ) ( e )1 510 h ( c )983 h 59.8 ( f )1 644 h P s P s 4 Fig. 4Results by B-scan method for continuous creep test ( 650ºC, 66 MPa ) ( a ) ( c ) 10 mm ( b )1 644 h, Fig. 5Cutting test results for continuous creep test specimen after rupturing 0 µm P s Vol.47 No.4 ( )

5 6 P s P s-ave P s-ave P s-ave P s-ave Ps-ave ( db ) 6 Fig. 6Correlation between averaged scattered ultrasound parameters and life consumption 7 Fig. 7Measurement under conditions of operating boiler Vol.47 No.4 ( )

6 Vol.47 No.4 ( )

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