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Process integrated nondestructive testing of laser-hardened components

: Kern, R.; Theiner, W.; Valeske, B.; Meyer, R.

Bartos, A.L.; Green, R.E.; Ruud, C.:
Nondestructive characterization of materials VII. Pt.2
Zürich: Trans Tech Publications, 1996
ISBN: 0-87849-730-7
International Symposium on Nondestructive Characterization of Materials <7, 1995, Prag>
Fraunhofer IZFP ()
Eigenspannung; hardening depth; hardness; Härte; Härtetiefe; laser beam hardening; Laserstrahlhärtung; nondestructive quality monitoring; residual stress

Micromagnetic Techniques developed during the last few Years have been found to be applicable to nondestructive evaluation of the machining quality of laser hardened components. Combining information of various microstructure- and stress-sensitive parameters, an immediate estimation of relevant quality parameters can be achieved. Using a multiple regression analysis, approximation functions can be obtained to determine values of hardness, hardening depth and residual stresses. Nondestructive evaluation of process/quality parameters is demonstrated for laser-hardened components using new multiparameter sensor systems. Based on these results, a prototype of a process integrated nondestructive testing system (PINT) for total inspection of laser-hardening quality is installed. Devices using PINT to monitor relevant quality parameters for process control in other industrial hardening applications (i.e. industion/case hardening) will be soon available.