Effect on fatigue performance of shot peened components: An analysis using DOE technique

The effect of shot peening on fatigue and corrosion behavior of 316L stainless steel in Ringer's solution

“…Therefore, the effect of impacts on the surface decreases and the following shot peening in a suitable time contributes to the reduction of heterogeneity and surface roughness. This behavior has been reported in other research and depends on material properties [15,16,23]. The image analysis results and scanning electron microscope photographs taken from the surface of specimens in different shot peening times are presented in Figs.…”

“…This figure shows that shot peening process increases the resistance to fatigue of specimens, such that 20 min of shot peening can increase it up to 6 times the initial value. Shot peening introducing compressive residual stresses, work hardening and grain refinement in the surface layers as has been reported in other researches [16,17,21] postpones the initiation and growth of surface cracks. The higher time of treatment produces the higher compressive residual stress area and therefore the higher fatigue strength.…”

“…Surface modifications produced by the shot peening treatment are (a) roughening of the surface (b) an increased, near surface, strain hardening and (c) the development of a characteristic profile of residual stress. Considering fatigue damage, surface roughening will accelerate the nucleation and early propagation of cracks, strain hardening will retard the propagation of cracks by increasing the resistance to plastic deformation and residual stress profile will provide a corresponding crack closure stress that will reduce the driving force for crack propagation [16]. It also in some cases due to introduction of a large amount of defects and/or interfaces into the surface layers transform the microstructure of surface to nano sized crystals [17].…”

Application of Bioreactor Concept and Modeling Techniques to Bone Regeneration and Augmentation Treatments

“…Particles can be used dry or embedded in liquid. When impacting the surface, part of the material is detached causing localized plastic deformation, which is used to create the surface roughness; to remove defects such as burrs, pores, and microcracks from the manufacturing process (machining); and to induce a surface layer of compressive residual stresses [80,81].…”

Review of Multiresponse Process Optimisation Methods

“…Chen et al 1996;Bandyopadhyay et al 2005;Sun et al 2007;Mahagaonkara et al 2009;Amini et al 2013;Wei et al 2013, etc. ), since it was introduced in 1980s.…”