Surface integrity is a term which comprises the surface properties of a workpiece after some kind of modification, e.g. a manufacturing process.
Properties that are included in the term surface integrity are on the surface of a material or in the material close to the surface. Properties on the surface can for example be related to topography or corrosion. Properties close to the surface in the material can be deformation of the microstructure or hardness.
Changes of surface integrity
Changes of the surface integrity can either be negative or positive. Negative changes can mean that a part does not perform the way it was intended to. The material may, for example, have unfavourable tensile stresses or have the wrong texture on the surface.
Changes to the surface integrity can also be used positively by using the changes to procuce a surface with intended properties. This could be a manufacturing process which, in addition to cutting the material to achieve the correct geometry, also affects the surface so it gets increased hardness or a desired texture.
Analysis of surface integrity
At Swerea we work with analyses of surface integrity in many different ways. We have the equipment and skills to measure and analyse residual stresses, hardness, topography and microstructure, light optically as well as with SEM to carry out in-depth analyses with, among other techniques, XRF and EBSD.