Research progress of laser-induced breakdown spectroscopy in metal reliability evaluation

Abstract

Critical metal components service safety and reliability evaluation is the core guarantee of industrial safety products. Laser-induced breakdown spectroscopy (LIBS) has been a rapidly developing atomic spectroscopy technique in recent years. It has attracted much attention in metal material reliability evaluation due to its unique advantages, such as no complicated sample pretreatment, simultaneous multi-element online analysis, and remote in-situ measurement. The article summarizes the methodological study of LIBS characterization of metal mechanical properties, including establishing a linear correlation between spectral properties (spectral line signal intensity and intensity ratio) and plasma temperature and metal mechanical property indexes. The mechanism of LIBS spectral characteristics to characterize metal aging state is sorted out, and the methods of LIBS to diagnose metal aging state, including establishing the correlation between spectral line signal intensity ratio and metal aging grade and using machine learning algorithms to improve the accuracy of prediction models, are introduced. The challenges and development status of the current development and application of portable LIBS devices are discussed, and the future research directions of LIBS in the field of metal mechanical properties and aging state characterization have been prospected.