“…Therefore, it is reasonable to assume that the variation of width and thickness in the specimen's gauge section does not influence the observed high value of ultimate tensile. It is well established that during machining because of tool-material interactions, the generated surface is affected through roughness, hardness, residual stress distribution and thereby, influence the mechanical properties of the manufactured parts (Kumar et al, 2017;Ben Fredj et al, 2006;Gürbüz et al, 2017;Ma et al, 2018). H. Sutanto (2007) investigated the characteristics of residual stresses during CNC milling machining and observed that very high compressive residual stress (−375 MPa) was induced at the surface of the work material.…”