Approaching non-destructive surface chemical analysis of CMSX-4 superalloy with double-pulsed laser induced breakdown spectroscopy

摘要

Laser induced breakdown spectroscopy(LIBS)was performed on the CMSX-4 Ni-based superalloy using a femtosecond pulsed laser.An orthogonal double-pulse technique was used to minimize surface damage associated with LIBS.With this technique,the depth of ablation craters was reduced from 200 nm for single-pulse LIBS down to less than 60 nm using orthogonal double-pulse LIBS.The technique also allowed the average velocity of the ablated material to be determined,which ranged from 4720±560 m/s at a pump laser fluence of 3.1 J/cm2 to 8150± 1800 m/s at 10.1 J/cm2.