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Characterization of hardening depth by Barkhausen noise measurement

: Bach, G.; Goebbels, K.; Theiner, W.A.

Materials evaluation 46 (1988), pp.1576-1580
ISSN: 0025-5327
Journal Article
Fraunhofer IZFP ()
Barkhausen noise; crank-shaft; electromagnetic testing; ferromagnetic; forging; foundry; hardness; heat treating; nondestructive testing; quality control; steel; stress; surface stress

Materials and components undergo the highest loads at their surfaces. To withstand mechanical loads, many methods are in use to increase surface and near-surface hardness. Conventional hardness and depth-of-hardness testing is destructive, time-consuming, and expensive. Therefore, there is an increasing demand for nondestructive testing techniques. Eddy current as well as modulated field-eddy current methods are suffering from undefined boundary conditions. This paper shows the correlation between magnetic. Barkhausen noise and hardening depth for components like crank shafts, racks, and brake pulleys. The method promises to work up to hardening depth values of about 5 mm.