# Evaluation of the Effectiveness of Surface Defect Removal by Slide Burnishing
## 1 Introduction
analyzed the correlations between surface roughness parameters and residual stresses in X6 CrNiMoTi17-12-2 stainless steel samples after slide burnishing with a diamond tool, also focusing on corrosion resistance [17]. Corrosion resistance was also investigated in [18], where the results demonstrated that subjecting samples made of 304 and 316L steel to a treatment combining turning with slide burnishing reduced their susceptibility to stress corrosion cracking. A study [PERSON] et al. investigated the effect of feed rate and diamond sliding burnishing force of X6 CrNiTi18 stainless steel on its surface topography, residual stresses, microhardness, and positron mean lifetime [19]. The impact of slide burnishing parameters on the surface roughness of 42 CrMo4 steel, with its hardness ranging from 21 \(\div\) 22 HRC, was determined via experiments and analyses using artificial neural networks in one study [20]. FEM simulations and their experimental validation were employed to evaluate the effect of burnishing force on the roughness of a machined surface in slide burnished galvanized steel sheets [21]. The FEM method was also employed by [PERSON] et al. to predict the residual stresses and strains in 41 Cr4 steel samples slide burnished using a tool with a diamond tip of 3.5 mm in radius [22]. In the slide burnishing process, an emulsion may be used to reduce the friction coefficient between the tool and the workpiece [16], or the process can be carried out without the use of machining fluids [12]. Studies conducted on C45 steel samples showed that the chemical composition of a liquid affected the roughness of a machined surface, including surface free energy [23]. The chemical composition of the cutting fluid, especially surface-active additives, was also found to affect the surface layer condition and fatigue life of titanium alloy samples [24]. Regular micro-irregularities and surface defects such as inclusions, pitted surfaces, patches, crazing, and scratches can also occur on the surface of a burnished workpiece [25; 26]. Surface defects can have different dimensions, so some defects may be difficult to detect. In studies by [PERSON] et al. [27] and [PERSON] et al. [28], various methods for detecting surface defects were described. The quality of manufactured items can be improved, among other things, by removing surface defects. This is very important due to the further use of the elements. A work by [PERSON] et al. presented the results of a study on the effectiveness of brushing treatment in surface defect removal in samples made of aluminum alloy EN AW-2024 and magnesium alloy AZ 91 HP [29]. In turn, [PERSON] et al. investigated the effect of chemical treatment on the surface and sub-surface defects of Ti-6 Al-4V titanium alloy objects that had been subjected to electron beam melting [30]. The literature review shows that surface defects are removed by brushing [29] or chemical treatment [30]. The positive effects obtained by slide burnishing (low surface roughness, increased microhardness, formation of compressive residual stresses) encourage research to be carried out with the aim of using slide burnishing to reduce surface defects. The aim of this work is to evaluate the effect of slide burnishing on the size of surface defects occurring in machined workpieces.