Composition ceramic coverings on steel 65Mn formation at rfheating and borating process
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AULOV, V., IVANAJSKIJ, V., ISHKOV, A., KRIVOCHUROV, N., KOVAL, D., SOKOLOV, A.. Composition ceramic coverings on steel 65Mn formation at rfheating and borating process. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 302.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Composition ceramic coverings on steel 65Mn formation at rfheating and borating process


Pag. 302-302

Aulov V.1, Ivanajskij V.1, Ishkov A.1, Krivochurov N.1, Koval D.2, Sokolov A.2
 
1 FSBSI the All-Russia research institute of technology of reconditioning and operation of machin-tractor park,
2 Altai State Agricultural University
 
 
Disponibil în IBN: 19 martie 2019


Rezumat

Methods of drawing of coverings are widely applied to improvement of physical-mechanical characteristics and restoration of the worn out surface of various details, surface strengthening and raise of a resource of technique in over-all and agricultural engineering industry by overlaying welding and raising dust, electro spark methods, and also methods of a chemical heat treatment [1]. Earlier by us it has been shown, that intensification of processes of a chemical heat treatment and, in particular, borating process, it can be carried out with application of short-term, high-speed heating a surface of a steel detail with the express borating structure put on it r.f. currents (RF-heating) up to temperatures of education of new phases and eutectics (1100-1350 oC) in systems Fe-B, Fe-B-C and Fe-Me-B-C where Ме is an alloying element from Cr, Mn, Ni, etc. [2].  It has been established, RF-heating at steel 65Mn covered by various borating mixes at the parameters of process proved earlier theoretically, on all samples coverings, on appearance reminding welding hard metal were formed (Table 1).  X-ray analysis of a covering has shown presence at it of the following phases: a-Fe, FeB and Fe2B (with expressed predominance Fe2B), Fe3(C, B) and Fe23(C, B)6, mixed borides both carbon borides of Fe and Mn, metha- and ortho-borates (Fe3BO3, Fe3BO6, Fe3BO5), traces of FeO and mixes FeO×Fe2O3, silicates, etc. Research of distribution of micro hardness of formatted coverings on depth has shown presence in them of two zones: harder surface layer, and less solid layer under it, extent and which characteristics discriminate.  Existence of such laminated structure in received coverings in our case speaks not simple presence of two phases FeB and Fe2B, allocated in a material one after another [3], and discriminating content of the basic hardening phase on depth of a covering.   To it testify both structure of received coverings, and dependence of thickness, hardness and comparative wear resistance of the coverings formed on samples, received on steel 65Mn for a various time from daubing on basis B4C without activators.