The Characterization of Fatigue Damage of 316L Stainless Steel Parts Formed by Selective Laser Melting with Harmonic Generation Technique

被引：13

作者：

Qiao, Rui ^{[1
]}

Yan, Xiaoling ^{[1
]}

机构：

[1] Beijing Technol & Business Univ, Sch Artificial Intelligence, Beijing 102488, Peoples R China

来源：

MATERIALS | 2022年 / 15卷 / 03期

关键词：

selective laser melting; fatigue damage; dislocation; crack; nonlinear ultrasonic; DEGRADATION; METALS;

D O I：

10.3390/ma15030718

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fatigue damage is the main reason for the failure of parts formed by selective laser melting (SLM) technology. This paper presents a high-order, harmonic, and nonlinear ultrasonic testing system for monitoring the generation and evolution of fatigue damage in SLM 316L stainless steel parts. The results demonstrate that the normalized ultrasonic, nonlinear coefficients show a significant dependence on the degree of fatigue damage of the tested specimen and that the normalized, ultrasonic, and nonlinear coefficients are effective in characterizing the degree of fatigue damage in SLM 316L stainless steel parts. Transmission electron microscope (TEM) and scanning electron microscope (SEM) analyses show that the variation in the normalized, ultrasonic, nonlinear coefficients reflect the generation and evolution process of dislocation and crack in the fatigue process of SLM 316L stainless steel specimens, and reveal the fatigue damage mechanism of SLM 316L stainless steel parts.

引用

页数：13

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