文献类型：期刊文献

英文题名：Nonlinear ultrasonic evaluation and simulation of precipitation coherence change in thermal aging damage of P91

作者：Shen, Jinchuan[1,5];Zheng, Yang[2];Li, Sujun;Zhu, Wujun[3];Shen, Xingquan[1,5];Zhou, Jinjie[1,5];Yu, Jingui[4];Yue, Wenying[1,5]

机构：[1]North Univ China, Sch Mech Engn, Taiyuan 030051, Peoples R China;[2]China Special Equipment Inspect & Res Inst, Beijing 100029, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[4]Wuhan Univ Technol, Sch Mech & Elect Engn, Wuhan 430070, Peoples R China;[5]North Univ China, Shanxi Key Lab Intelligent Equipment Technol Harsh, Taiyuan 030051, Peoples R China

年份：2025

卷号：229

外文期刊名：MATERIALS CHARACTERIZATION

收录：;EI(收录号：20253719159581);WOS:【SCI-EXPANDED(收录号:WOS:001583423800001)】；

基金：The Guiding Funds of Central Government for Supporting the Development of the Local Science and Technology (YDZJSX2024B006) ; Funding Supported by National Natural Science Foundation of China under Grant Nos. 62071433 and 12004114.

语种：英文

外文关键词：Nonlinear ultrasonic; Thermal aging; Aging damage; Damage detection; Molecular dynamics

摘要：The thermal aging damage of P91 steel was assessed using nonlinear ultrasonic detection technology. Acoustic nonlinear parameters demonstrate high sensitivity to thermal aging damage. The variation in acoustic nonlinearity during the early thermal aging period results from the interplay between a reduction in dislocation density and the coarsening of carbide precipitation. In the late thermal aging period, a loss of precipitation coherence leads to a reduction in acoustic nonlinear parameters. Based on the existing prediction model, dynamic mismatch parameters are added, and the precipitation size distribution is coupled with the corresponding mismatch parameters. This model effectively captures the contributions of both the precipitation size distribution and coherence variations to acoustic nonlinearity. Based on the molecular dynamic method, the contribution of precipitation coherence to acoustic nonlinearity is explored from a microscopic perspective. Both experimental and simulation studies demonstrate the potential of nonlinear ultrasonic detection technology for detecting changes in precipitation coherence.