Fatigue-Induced Micro-damage Characterization of Austenitic Stainless Steel 316 Using Innovative Nonlinear Acoustics

被引：19
|
作者：
Kim, Chung-Seok [1 ]
Jhang, Kyung-Young [1 ]
机构：
[1] Hanyang Univ, Seoul 133791, South Korea
来源：
CHINESE PHYSICS LETTERS | 2012年 / 29卷 / 06期
基金：
新加坡国家研究基金会;
关键词：
BEHAVIOR; WAVES;
D O I：
10.1088/0256-307X/29/6/060702
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present innovative nonlinear acoustics for characterizing fatigue-induced micro-damage of austenitic stainless steel 316 subjected to high-cycle fatigue. Various fatigue-driven deformations are accumulated at several positions near the middle of hourglass-shaped specimens. A bell-shaped curve of acoustic nonlinearity as a function of position is observed, and the variation in acoustic nonlinearity is attributed to the evolution of a lattice defect (dislocation) and stress-induced martensite based on transmission electron microscopy (TEM) observations. An oblique incidence technique using a longitudinal waveform is a potentially viable method for characterizing the high-cycle fatigue deformation of austenitic stainless steel 316 alloys.
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页数：4
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