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Case Study: Surface Defect Analysis of Bearing Grade Hot Rolled Steel

From Resonic NDT Systems
 

 

Four samples of 1.90" diameter by 15.5" length bearing grade hot rolled steel samples were evaluated for detection of small surface defects of significantly less than 1% of volume. To adequately detect small features on the order of.2" l x .006" w x .006"d. (2) resonance-mode electromagnetic acoustic transducers (RM-EMAT) were fabricated for this test. The transducer width is 1.3" with an axial inspection window of about .75". The first transducer was a 1.970" ID was a N:29 or 29 wavelength transducer that produced a resonant frequency of approximately 547 kHz. This transducer did not provide sufficient resolution of defects significantly below 1% of cross-sectional volume. The second transducer was a N:37 or 37 wavelength design and produced axial shear resonant modes at approximately 870 kHz.

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Non-destructive testing (NDT) supplies and accessories are used to detect, inspect, and measure flaws, bond integrity, and other material conditions without permanently altering or destroying the examined part or product. Search by Specification | Learn more about Nondestructive Testing (NDT) Equipment
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Flaw detectors are nondestructive testing instruments that can detect or measure defects in raw materials or finished products. Search by Specification | Learn more about Flaw Detectors
Non-destructive testing (NDT) material testers are devices, machines and equipment that are used to determine residual stress, alloy type, hardness, microstructure, elasticity, heat treatment and other material conditions without permanently altering or destroying the material being examined. Search by Specification | Learn more about Nondestructive Testing (NDT) Material Testers
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