Investigation of the crater-like microdefects induced by laser shock processing with aluminum foil as absorbent layer

Nonuniformity of morphology and mechanical properties on the surface of single crystal superalloy subjected to laser shock peening

“…Similar morphological characterizes were also reported in Ref. [20], and they formed on pure copper blocks under a LSP treatment with aluminum foil as absorbent layer. However, unlike the crater-like microdefects mentioned in the reference there were no melt signs found in this work.…”

Microscopic surface topography of a wrought superalloy processed by laser shock peening

“…Reference [32] investigated the formation mechanism of a crater-like microdefects induced by LSP with aluminum foil as absorbent layer, however, unlike the crater-like microdefects mentioned in the reference there were no melt signs to the microdefects found in this work. It must be pointed out that the sample suffered three impact times obtained the highest density of dot microdefects while they were rarely observed on the surface of the sample processed by one LSP impact.…”

“…In addition, considering that the changes of the absorbing layer material introduced gas bubbles inevitably, and the intensive dot microdefects were associated with the gas bubbles. The formation of the microdefects is maybe due to the coupling effect of impact force and temperature, and they generally form on the regions where bubbles exist [32].…”