Surface hardness determination of 3D printed parts using laser-induced breakdown spectroscopy

Abstract

Laser-induced breakdown spectroscopy was used to determine the relationship between the spectral line intensity and surface hardness of 3D printed 18Ni300 maraging steel. Research found that there is a linear relationship between the spectral intensity ratio of ion line to atomic line and the surface hardness of the samples. This linear relationship is closely related to the selected elements and spectral lines. The weak self-absorption spectrum of minor elements can obtain a better linear relationship. We study the effect of the number of laser pulses on the linear relationship. The results show that the ideal results can be obtained by using 100 pulses, which can minimize the damage to the sample.

Microstructure classification of steel samples with different heat-treatment processes based on laser-induced breakdown spectroscopy (LIBS)

“…They suggested that the material's hardness affects the laser shock wave rate, influencing ablation mass size, resulting in varied plasma ionization rates and affecting plasma temperature. 46 Abdulmadjid et al concluded that the laser excitation front's velocity depends on the sample's hardness. They observed a positive correlation between the velocity of the excitation front and the ionization rate of the ablated atoms.…”

Using laser-induced breakdown spectroscopy to characterize the surface mechanical properties of soft materials

“…Recently, its application as an innovative method for in situ characterizing materials’ surface mechanical properties has been validated frequently. 11–36 All papers found regarding this topic used materials with strengths much larger than dozens of MPa (hereinafter defined as solid materials) such as concretes, 11 mineralized biological materials, 12–15 bulk metals, 16–28 ceramics, 29,30 stones, 31–35 and pharmaceutical tablets. 36 In almost all of these papers, the method was developed in light of the role of the shock wave in the expansion of a laser-induced plasma from a solid material after the end of a laser pulse.…”