| ABSTRACT: | USAGE OF BARKHAUSEN EFFECT FOR HARDENING QUALITY CONTROL OF NEAR-
SURFACE LAYERS OF TRANSPORT MACHINE PARTS
M. Budennyy, G.d Gritsenko., A.p. Liubchenko, T.v. Chigrina, and S.i. Yavorovich
State Enterprise "malyshev Plant", Kharkov, Ukraine
Some patterns of magnetic noises electromotive force (EMF) - Barkhausen effect - depending on change of
ferromagnetic materials strength characteristics, static loading conditions and level of plastic deformation
with the purpose of this factor usage enhancement for mechanic hardening non-destructive control, have
been studied. Practicability of EMF and magnetic noises usage in order to control the stated factors and their
place among other methods of non-destructive control was evaluated.By methods of non-destructive control
the impact of Barkhausen effect patterns on value and sign (strain - compression) of static loading in elastic
and elasto-plastic domain for 65G and 38CrSi steel was studied. The character of graded magnetic noises
EMF change at compression differs from the same change at strain, and that is evidence of magnetic noises
method sensitivity to deformation sign.
The experimental research results of correlation dependencies between characteristics laser-hardened near-
surface cast-iron layers with lamellar graphite grains and factors Barkhausen effect have been quoted.
Correlation between laser-hardening depth, that is determined metallographically, and the value of graded
magnetic noises EMF has been stated, and that permits to use the results of these measurements for laser-
hardening depth non-destructive control on important parts of diesels and similar plants.
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