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Influence of Trace Boron and Cooling Rate on the Thermal Embrittlement of 2.25Cr-1Mo Steel
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Study on Thermal Fatigue Behavior of Boride Layer of H13 Steel
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Interactive Mechanisms of Sulfide Inclusions and Environmental Factors in Low Cycle Fatigue Process of Pressure Vessel Steels in High Temperature Water
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Evaluation of Thermal Degradation of 2.25Cr-1Mo Steel by High Frequency Ultrasonic Attenuation Measurement
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Damping Capacity of the Fe-Cr-Al Based Alloys
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An Investigation of a Nitrogen Enhanced Steel Processed by Explosive Powder Compaction
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Development of the SAW Wire for High Strength TMCP Steel
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Evaluation of Thermal Degradation of 2.25Cr-1Mo Steel by High Frequency Ultrasonic Attenuation Measurement

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Abstract:

It was attempted to assess nondestructively the degree of isothermal degradation of 2.25Cr-1Mo steel by using high frequency longitudinal ultrasonic wave. Microstructural parameter (mean size of carbides), mechanical property (Vickers hardness) and ultrasonic attenuation coefficient were measured for the 2.25Cr-1Mo steel isothermally degraded at 630°C for up to 4800 hours in order to find the correlation among these parameters. The ultrasonic attenuation coefficients at high frequencies (over 35MHz) were observed to increase rapidly in the initial 1000 hours of degradation time and then slowly thereafter, while the ones at low frequencies showed no noticeable increase. Ultrasonic attenuation at high frequencies increased as a function of mean size of carbides. Ultrasonic attenuation coefficient was found to have a linear correlation with the hardness, and suggested accordingly as a potential nondestructive evaluation parameter for assessing the mechanical strength reduction of the isothermally degraded 2.25Cr-1Mo steel.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

257-260

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.257

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Online since:

January 2005

Authors:

Jai Won Byeon, C.S. Kim, S.I. Kwun, S.J. Hong

Keywords:

2.25Cr-1Mo Steel, Non-Destructive Evaluation (NDE), Thermal Degradation, Ultrasonic Attenuation

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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