Abstract
This work compares various mechanical surface treatment techniques applied to improve the properties of the AISI 304 austenitic stainless steel. Effects of laser shock peening (LSP), water jet cavitation peening (WjCP), water jet shot peening (WjSP), and ultrasonic impact treatment (UIT) on surface roughness, hardness, and residual stress were studied. The results demonstrate that as compared to the untreated specimen (Ra = 3.06 μm), all strain hardening methods demonstrate the decreased surface roughness parameters. The smallest Ra parameter of the wavy regular surface microrelief is formed after the ultrasonic treatment. The surface hardness (22.1 HRC5) was respectively increased by 30.7%, 38.4%, 69.6%, and 73.2% after the LSP, WjCP, WjSP, and UIT treatments. All peening techniques induced compressive residual stresses (ranged from –377 MPa to –693 MPa) in the near-surface layer. It is assumed that used treatments can increase wear/corrosion resistance and fatigue life in the studied steel.
Highlights
Improvement in the surface properties of the end-products by changing their microrelief, grain structure, hardness, and residual macrostresses is very relevant due to the fact that the destruction of the materials depends usually on the surface structural state
It is well known that enhancing the operational properties of the metal components are largely provided by the surface plastic deformation (SPD) methods due to the formation of specific microrelief on the surface and fine-grained structure in sub-surface layers [1]
Various peening methods, such as conventional shot peening (SP) [2], cavitation peening (CP) [3], laser shock peening (LSP) [4], ultrasonic impact treatment (UIT) [5], and hammer peening [6] are widely used for treatment both large-sized and small-sized metal components in the industry to provide severe plastic deformation of their subsurface layers
Summary
Improvement in the surface properties of the end-products by changing their microrelief, grain structure, hardness, and residual macrostresses is very relevant due to the fact that the destruction of the materials depends usually on the surface structural state. It should be noted that the multi-pin UIT technique can be regarded as the most effective process to improve both the surface roughness and hardness of the surface layer [7]. The comparative studies of the multi-pin UIT technique with the WjSP, WjCP and LSP peening methods for mechanical surface treatment of stainless steel parts are virtually absent.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
