Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

Abstract

In this work, laser-induced breakdown spectroscopy (LIBS) analysis is optimized for direct estimation of elemental composition, thermal conductivity and hardness for Ni-Cr-Nb alloys. These alloys were chosen with a variable elemental content of niobium and chromium. The influence of laser energy and shot numbers on measuring line intensity was investigated. Based on the ratio between two spectral lines, calibration curves were formed to estimate the element concentration and LIBS results were confirmed with related energy-dispersive X-ray spectroscopy (EDS) data. Hardness and thermal conductivity estimation using LIBS were done by measuring the ratio between two spectral lines, plasma excitation temperature and electron density for different samples. Semi-empirical formulas correlated hardness and thermal conductivity with plasma temperature were established.

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

“…19 Salloom et al achieved estimations of hardness and thermal conductivity by evaluating the ratio between two spectral lines, plasma excitation temperature, and electron density for diverse samples, devising semi-empirical formulas. 20 Dubey et al established a linear correlation between Mohs hardness and plasma excitation temperature. 21 ElFaham et al formulated a calibration curve linking the ratio of ionic line intensity to atomic line intensity in the LIBS spectra of spring steel DIN50Cr3 with the ratio of Vickers mechanical hardness, concurrently conducting microstructural analysis.…”

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.…”