title: Characterization of hardened cylindrical C1018 steel rods (0.14%-0.2% C, 0.6%-0.9% Mn) using photothermal radiometry.
abstract: Frequency-domain photothermal radiometry has been used for the evaluation of the hardened case depth and the measurement of the thermophysical properties (thermal conductivity and diffusivity) of cylindrical C1018 heat-treated steel rods. The measurement results of several steel cylinders nominally hardened identically during a common heat-treating process were consistent with each other and also with mechanical indentation hardness test results. The application of the two-layer composite cylinder thermal-wave theory yielded an effective case depth within the discrete two-layer thermal-wave approximation. This technique provides a relatively simple noncontact and nondestructive method for evaluating the thermophysical parameters of layered cylindrical samples. The good fit of the experimental frequency scans to the two-layer thermal-wave model was shown to constitute a reasonable method for calibrating actual continuously decreasing hardness depth profiles by means of abrupt two-layer-equivalent profiles.
authors.affiliation: Institute of Modern Optical Technologies, Suzhou University, Suzhou, Jiangsu 215006, People's Republic of China.
authors.forename: Chinhua
authors.initials: C
authors.lastname: Wang
authors.forename: Andreas
authors.initials: A
authors.lastname: Mandelis
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006244:Hardness; D006245:Hardness Tests / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013232:Steel / Q000737:chemistry*; D013499:Surface Properties; D013814:Thermal Conductivity; D013817:Thermography / Q000295:instrumentation* / Q000379:methods
chemical_list: D013232:Steel