文献类型：期刊文献

英文题名：Experimental study of thermal degradation in ferritic Cr-Ni alloy steel plates using nonlinear Lamb waves

作者：Xiang, Yanxun[1];Deng, Mingxi[2];Xuan, Fu-Zhen[1];Liu, Chang-Jun[1]

机构：[1]E China Univ Sci & Technol, Key Lab Safety Sci Pressurized Syst MOE, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Logist Engn Univ, Dept Phys, Chongqing 400016, Peoples R China

年份：2011

卷号：44

期号：8

起止页码：768

外文期刊名：NDT & E INTERNATIONAL

收录：;EI(收录号：20113914363600);WOS:【SCI-EXPANDED(收录号:WOS:000295768200013)】；

基金：This work is supported by the National Natural Science Foundation of China under grant numbers (50835003, 10972078, 10974256, and 11004056), Natural Science Foundation of Shanghai (09JC1404400), and the National High Technology Research and Development Program ("863"Program) of China under grant number 2009AA04Z421.

语种：英文

外文关键词：Ultrasonic nonlinearity; Lamb wave; Thermal degradation; Ferritic Cr-Ni steel; Dislocations

摘要：The thermal degradation in ferritic Cr-Ni alloy steel plates is measured using the nonlinear effect of Lamb wave propagation. Experiments were carried out to introduce controlled levels of thermal damage to determine the nonlinear response of Lamb waves. A "mountain-shape" change in the normalized acoustic nonlinearity of Lamb wave versus the level of thermal degradation in the specimens has been observed. The variation in the measured acoustic nonlinearity reveals, based on metallographic studies, that the normalized acoustic nonlinearity increases due to the second phase precipitates in the early stage and it decreases as a combined result of dislocation change and micro-void initiation in the material. The results show a potential application of the nonlinear Lamb waves for the quantitative assessment of thermal damage in metallic plates or pipes. (C) 2011 Elsevier Ltd. All rights reserved.