https://doi.org/10.1140/epjst/e2008-00465-9
Evaluation of effective case depth in heat treated steel products using photothermal radiometry
1
Institute of Modern Optical Technologies, Suzhou University, Suzhou, Jiangsu, 215006, P.R. China
2
Key Lab of Modern Optical Technologies of Jiangsu Province, Suzhou, Jiangsu, 215006, P.R. China
3
Center for Advanced Diffusion-Wave Technologies, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, M5S 3G8, Canada
A quantitative calibrated methodology based on photothermal radiometric (PTR) depth-profilometry for non-contact, non-intrusive determination of effective case depth in heat treated case-hardened steel products was developed. Several types of heat-treated C1018 industrial steel screw products (with hexa- gonal, cylindrical and spherical heads) were statistically evaluated using the case-depth – induced interferometric thermal-wave phase minima. Calibration curves for each type of sample were established with the help of conventional destructive indenter measurements. It is shown that PTR thermal-wave interferometric phase minima can be used as a fast, on-line inspection methodology of industrial steel products for non-destructive quality control of heat treating processes.
© EDP Sciences, Springer-Verlag, 2008
