Abstract
This paper presents the results of investigations of the effect of graphene oxide and surface shot peening on the mechanical properties and fatigue life of bolts made of austenitic 304 steel. An innovative method for the uniform deposition of graphene oxide on screws is presented. The process involved activating the surface using plasma and then performing graphene oxide deposition using centrifugal force and vacuum drying. The screw specimens prepared in this way were subjected to a surface peening process. Comparative studies have shown that the combination of graphene oxide deposition and shot peening processes results in an increase in fatigue life of approximately 42 ÷ 275% (depending on the stress amplitude level) compared to the as-delivered samples. The results presented are promising and may provide a basis for further research on the application of graphene and its derivatives to increase fatigue life and improve the mechanical properties of machine components.
Highlights
Modification of the surface layer of machine components can have a significant effect on improving their mechanical properties [1,2,3,4,5,6,7]
This was the effect of graphene oxide being introduced into the surface layer during the shot peening process;
The innovative process developed combining surface cleaning and activation, graphene oxide application, and vacuum drying resulted in permanent deposition of graphene oxide on the surface of screws;
Summary
Modification of the surface layer of machine components can have a significant effect on improving their mechanical properties [1,2,3,4,5,6,7]. Soyama [4,7,8,9,10,11,12,13], Takakuwa [12,13], and Nakonieczny [14,15] devoted numerous scientific publications to the effect of the shot peening process on the structural, mechanical, and fatigue properties of structural materials They showed that the surface crushing created by surface peening leads to compressive stresses in the subsurface layers affecting crack development. In non-surface-strengthened specimens, crack initiation usually occurs at the bottom of structural or geometric notches, They showed that the surface crushing created by surface peening leads to compressive stresses in the subsurface layers affecting crack development. In non-surfacestrengthened specimens, crack initiation usually occurs at the bottom of structural or geometric notches, whereas the introduction of a state of subsurface compressive st2reosf s1e3s can shift the crack initiation site to the point of maximum material stress below the surface [5,15] and, most importantly, increase fatigue life
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