Numerical simulation of laser ultrasonic detection of the surface microdefects on laser powder bed fusion additive manufactured 316L stainless steel  

作　　者：Yang Liu Zhixin Peng Sheng Liu Ping Hu 

机构地区：[1]The Institute of Technological Sciences,Wuhan University,Wuhan 430072,China [2]School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China

出　　处：《Theoretical & Applied Mechanics Letters》2022年第6期451-458,共8页力学快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2017YFB1103900);the National Natural Science Foundation of China(No.51605340)。

摘　　要：A numerical model is presented in this article to investigate the interactions between laser generated ultrasonic and the microdefects(0.01 to 0.1 mm),which are on the surface of the laser powder bed fusion additive manufactured 316L stainless steel.Firstly,the influence of the transient sound field and detection positions on Rayleigh wave signals are investigated.The interactions between the varied microdefects and the laser ultrasonic are studied.It is shown that arrival time of reflected Rayleigh(RR)waves wave is only related to the location of defects.The depth can be checked from the feature point Q,the displacement amplitude and time delay of converted transverse(RS)wave,while the width information can be evaluated from the RS wave time delay.With the aid of fitting curves,it is found to be linearly related.This simulation study provides a theoretical basis for quantitative detection of surface microdefects of additive manufactured 316L stainless steel components.

关 键 词：Laser ultrasonic Numerical simulation Metal additive manufacturing Surface defects 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TN249[金属学及工艺—金属材料]