Surface contamination induced by warm severe surface peening using 100C6 steel and ZrO2 shots

Abstract

The sample surface contamination induced during Surface Mechanical Attrition Treatment (SMAT) was studied after peening treatments carried out with 100C6 steel and ZrO₂ zirconia shots at room temperature, 523 K, and 773 K. All constituting parts of the treatment device (sonotrode, chamber, shots) contributed to sample surface contamination. Increasing the SMAT temperature led to a higher surface contamination with bigger contaminant debris as well as sample surface oxidation. In particular, several ZrO₂ shots were fragmented at 773 K due to a phase transformation embrittlement under warm condition.