Controlled shot-peening is a treatment aimed at enhancing the fatigue resistance of case-hardened, nitrided, or quenched and tempered parts. This process can reach significant depths and is often used to delay or prevent failures caused by stress corrosion, fretting, pitting, and to mitigate the adverse effects of surface decarburization.<\/p>\n\n\n\n
In the aerospace sector, it is also applied prior to electroplating to eliminate hydrogen embrittlement resulting from the coating process.<\/p>\n\n\n\n
The improvements in fatigue resistance that can be achieved are often highly significant. These depend not only on the treatment parameters, but also on the surface condition of the part and its loading conditions.<\/p>\n\n\n\n
Table 1 shows some of the most common results.<\/p>\n\n\n