S.P 3 Electropulse strenthening in magnetofluidized layer
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GONCIARUC, Valeriu, БОЛОГА, Мирча. S.P 3 Electropulse strenthening in magnetofluidized layer. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, pp. 281-282.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

S.P 3 Electropulse strenthening in magnetofluidized layer


Pag. 281-282

Gonciaruc Valeriu1, Болога Мирча2
 
1 Технический Университет Молдовы,
2 Институт прикладной физики
 
 
Disponibil în IBN: 22 aprilie 2021


Rezumat

The magnetofluidized layer is produced through the magnetic fluidization of the ferromagnetic asymmetric particles under the action of the external electromagnetic field. The ferromagnetic particles take substantial translational and rotational velocities in the rotational electromagnetic field. Thus, at the inductions of the magnetic field of (10÷45)·10-3 T, the particle length-to-diameter ratio 8÷14 (the diameter of the particles is 1-3 mm) the average translational velocities are 2.5 m/s, and rotational ones are 320 rad/s, their greatest values amounting up to 7 m/s and 1200 rad/s, respectively. The kinetic energy of the particles is sufficient, their impact with the surface of the treated piece to cause its surface-plastic deformation. The electropulse strengthening in the magnetofluidized layer is carried out in the coaxial system of two cylindrical surfaces connected to two different pole terminals of the dc power supply. One of the surfaces is the wall of the working chamber being the anode. The other surface is the treated piece being the cathode. Ferromagnetic particles in the magnetofluidized layer create between the anode and cathode electroconducting chains which regularly originate and break. It results in the appearance of the electropulse discharges in the bulk and on the surface of the piece. A metal powder with the known physic-mechanical properties is added into the metal powder. The powder melts under the action of the electropulse discharges and in the liquid state is applied to the piece surface. There occurs the simultaneous impact treatment of the surface by the ferromagnetic particles. The appearance in the piece surface layers of the extending residual stresses is a great drawback of the existing methods of the electropulse strengthening. To neutralize it there are used additional treatment methods including the surface-plastic deformation of the piece [1]. At the electropulse strengthening in the magnetofluidized layer this drawback is neutralized and there are generated compressing residual stresses in the surface layers due to the impact action of the ferromagnetic particles causing the surface-plastic deformation of the applied coatings. The generation of the compressing residual stresses in its turn allows to increase the endurance of the strengthened pieces.