Evaluation of thermal degradation of 2.25Cr-1Mo steel by high frequency ultrasonic attenuation measurement

    Authors

    J. W. Byeon; C. S. Kim; S. I. Kwun;S. J. Hong

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Keywords

    ultrasonic attenuation; nondestructive evaluation; thermal degradation; 2.25Cr-1Mo steel; NONDESTRUCTIVE EVALUATION; TEMPERATURES; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    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 degrees 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.

    Journal Title

    Pricm 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing, Pts 1-5

    Volume

    475-479

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    257

    Last Page

    260

    WOS Identifier

    WOS:000227494709056

    ISSN

    0255-5476; 0-87849-960-1

    Share

    COinS