Transverse depth-profilometric hardness photothermal phase imaging of heat treated steels

A method to image near-surface hardness profiles of heat-treated case-hardened steels using laser infrared photothermal radiometric phase imaging is described. It is shown that thermophysical and mechanical transverse inhomogeneity profiles in industrial case hardened steel samples are well correlat...

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Bibliographic Details
Published in:Journal of applied physics 2003-11, Vol.94 (9), p.5543-5548
Main Authors: Liu, Yue, Baddour, Natalie, Mandelis, Andreas
Format: Article
Language:English
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Summary:A method to image near-surface hardness profiles of heat-treated case-hardened steels using laser infrared photothermal radiometric phase imaging is described. It is shown that thermophysical and mechanical transverse inhomogeneity profiles in industrial case hardened steel samples are well correlated. Phase surface scanning imaging leads to a practical criterion for assessing transverse hardness homogeneity. A simple method based on phase imaging is proposed as a quantitative criterion to determine which steel samples should be rejected for thermal-wave depth-profilometric reconstruction of thermal diffusivity or conductivity.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1613808