Deformation of a scratch may indicate developement of
subsurface residual strain in the workpiece. Titanium
workpiece,60 m/min surface speed. Visible light movie
is 180000 frames per second. Field of view is about
1 mm wide. For more information, goto NIST publications
"Machining Process Measurements: A Titanium Machining
Example" and "Tool Temperatures in Orthogonal Cutting
of Alloyed Titanium."
