文献类型：期刊文献

英文题名：Cumulative second-harmonic analysis of ultrasonic Lamb waves for ageing behavior study of modified-HP austenite steel

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

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Safety Sci Pressurized Syst MOE, Shanghai 200237, Peoples R China;[2]Logist Engn Univ, Dept Phys, Chongqing 401331, Peoples R China

年份：2011

卷号：51

期号：8

起止页码：974

外文期刊名：ULTRASONICS

收录：;EI(收录号：20113014182349);WOS:【SCI-EXPANDED(收录号:WOS:000293011800016)】；

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：Lamb waves; Second-harmonic; Ferritic Cr-Ni steel; Precipitation kinetics; Thermal ageing

摘要：The cumulative second-harmonic analysis of ultrasonic Lamb wave has been performed to study the precipitation kinetics and microvoid initiation of ferritic Cr-Ni alloy steel during the ageing process. Ageing of ferritic Cr-Ni alloy materials have been done at 1223 K and 1173 K for different degradation time intervals and air cooled. The results show that the normalized acoustic nonlinearity of Lamb wave increases with the formation of fine precipitates at the early stage of ageing till about 1000 h and keeps as a plateau with the precipitates dynamic balance for a long-term ageing, and then decreases gradually at the final holding time with the coarsening of precipitates and initiation of microvoids. The results also show that the variation of nonlinear Lamb wave follows the same trend as that of hardness in materials. Therefore, the cumulative second-harmonic of ultrasonic Lamb waves has been found to be strongly sensitive to the precipitates behavior and microstructure evolution during the thermal ageing of ferritic Cr-Ni alloy steel. (C) 2011 Elsevier B.V. All rights reserved.