A XC carbon steel disk was submitted to the friction of a 100 C 6 steel bearing ball on a pin-on-disk tribometer. The geometry of the surface was periodically measured as was the state of the stresses, on a single point of the wear track using a very simple location process. The wear track was quickly grooved while the normal stresses (parallel to the plane of the surface) increased fast. The shearing stresses remain weak.

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