THE EFFECT OF KINETIC PLASTICITY AND ITS APPLICATION IN PLASMA SURFACING OF ECONOMICALLY ALLOYED HEAT-RESISTANT ALLOYS

To strengthen the parts of machines of the mining and metallurgical complex operating under abrasive wear conditions, chromium-tungsten heat-resistant steels of the R18, R6M5, R9, P2M8, 3X2V8, 3X2V4F, Kh10V14, 25Kh5FMS types, etc. are widely used as surfacing materials. Currently, it is economically and technically feasible protect the surfaces of parts of critical machines and mechanisms and use hardening coatings. The most promising method among others is the surfacing of coatings. This article shows that in the deposited metal of the type of economically alloyed P2M9 alloy, the effect of kinetic plasticity is observed during martensitic transformation. The concept of "economical alloying" of alloys is based on the choice of such alloying elements that would have a relatively low cost and / or would be included in the most affordable master alloys. Fulfillment of these conditions allows to reduce the cost of the production process and, accordingly, to reduce the cost of semi-finished products and finished products without significant loss in mechanical and operational properties. When blending such alloys, available "natural alloys" are often used, such as ferrotitanium and ferrovanadium. The advantages of economically alloyed alloys should also include ample opportunities for the use of scrap and production waste in smelting. Alloys can also be alloyed with microadditives of rare earth materials. However, the main disadvantages of this group of alloys are the insufficient level and instability of properties, as a result of which they are currently recommended for use mainly in terrestrial objects: medical implants, car parts and various decorative items. The effect of kinetic plasticity during martensitic transformation plays a decisive role in stress relaxation. The influence of the effect of kinetic plasticity on the nature of the formation of temporary and residual stresses during cooling of specimens of deposited metal of the P2M9 alloy and steel 12Kh17 on a thermal microscopy unit IMASH – 20–75 has been investigated. The manifestation of the effect of kinetic plasticity was assessed by the decrease in temporary stresses during the cooling of rigidly fixed samples in the temperature range of martensitic transformation. It is shown that the effect of kinetic plasticity can be used to regulate the stress state and prevent the formation of cold cracks in parts of mining and metallurgical equipment deposited with heat-resistant steels of high hardness.

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