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Quantitative nondestructive evaluation of machined surface states by X-ray and micromagnetic techniques
Grinding and turning as well as shot peening, work hardening, diamond burnishing and power brush finishing are changing the microstructure and residual stresses in machined parts. Beside the depth of the influenced perpheral layer also the surface distribution of microstructure and residual stress have to be measured by rapid scanning nondestructive testing systems. The employed methods should be sensitive to changes in the influenced layers up to about 200 MilliMy and should have a local resolution of about 1 mm. Because microstructure and residual stress states both influence the measured signals, only multiparameter strategies can garantee unambiguous testing results.