High-temperature oxidation behavior of laser-surface-alloyed incoloy-800H with Al

摘要

The high-temperature oxidation resistance of laser-surface-alloyed Incoloy-800H with Al has been investigated. Several samples have been exposed to 1000° C in air and subsequently analyzed by optical microscopy, SEM, and electron microprobe X-ray fluorescence spectroscopy in order to determine their microstructure and composition. The results show that the laser-treated materials have a considerably higher oxidation resistance than the nontreated materials due to the formation of an Al-rich layer close to the surface, which acts as a barrier against oxygen diffusion into the bulk. © 1997 Plenum Publishing Corporation.