Abstract
Grinding burn occurs during the grinding process of hardened steel surfaces if a local heat impact is high enough to generate local tempered or even re-hardened zones. Different NDT methods are applied to detect grinding burn. This lecture shares experiences and results of manufacturing and assessment of reference blocks with defined artificial defects generated by laser treatment for grinding burn detection. The reference blocks can be used for electromagnetic testing methods as well as for surface temper etching (STE). These blocks are used for calibration of the test equipment, especially to verify the sensitivity before testing real parts. In addition, reference blocks are applied in certain intervals within the process in order to guarantee testing reliability.
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