A higher flow stress might lead to less surface deformation and a smaller real contact area. This might reduce adhesion. High strength is often connected with high hardness and therefore less abrasive wear. However, high strength might also be connected with less ductility and higher fatique wear.
It is follow up an answer of Mr. Roy. This question is not straight forward. We need to understand in many ways. In my point of view, higher the flow stress means, the material exhibiting the viscoelastic properties. Normally, viscoelastic materials have the ability to recover their deformation as the time goes, thus increases the wear resistance.
Because slip bands reduce the volume of the surface layer
which is deformed.
because high viscoelasticity increases the wear resistance
Corrosion typically starts from the surface of the metal part. In the manufacture of parts on the surface are small damages, scratches, cracks. Improves the surface condition of a variety of methods, including mechanical, for example by treatment surface with the help of high pressure. At mechanical stress in the surface layer there may be high voltage reaching the yield point. Such stresses cause plastic deformation, contributing to the improvement of the surface of the metal layer. Is also useful to train the surface of detail, loading its by the external pressure with subsequent unloading.
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