Editorial: special issue on shot peening

Shot Peening of Austempered Ductile Iron

“…Although SP is not a new process, it is still very popular and has evolved considerably in the late twentieth and early twenty-first centuries. A great deal of research has been carried out to study the effects of SP on the materials being treated, including metallurgical, mechanical, and geometrical effects and also the effects of SP on the mechanical properties, tribological characteristics and corrosion resistance of a wide range of metals and alloys [11]. Recently, advanced surface modification technologies show the use of variants of the traditional SP process, four of which are shown in this issue, namely ultrasonic SP, severe SP (SSP), surface mechanical attrition treatment (SMAT) and duplex SP.…”

“…As a result of work hardening and phase transformation, the hardness at the surface following SP of ADI increases by approximately 40-60% [11,[14][15][16][17][18][19]. Apart from an increase in the surface hardness, SP also results in the creation of compressive residual stresses of around 700-1000 MPa [15][16][17][18][19].…”

“…The SP process is constantly maturing, and many questions still remain open as the industry is continuously on the search for process improvements that improve and extent the service lifetime of components. For example, the improvement in surface roughness has improved the tribological characteristics, the ability to create textured nanostructured surface layers and also new equipment and techniques to characterise the treated surfaces [11].…”