Properties of Powdered High-Chromium Steel Made from Particles Obtained by Electroerosion of Steel X17 in Kerosene

The purpose. To investigate the structure and properties of sintered samples from electroerosive high-chromium powders obtained by electrodispersion in lighting kerosene.

Methods. To carry out the planned studies, 12X17 steel waste was selected as a dispersible material, which accumulates in large volumes at enterprises. 12X17 steel waste was processed at an electrodispersing plant. The electrodispersion process was carried out under the following conditions: voltage 100 V; pulse repetition frequency 120 Hz; capacity 48 UF. Lighting kerosene was used as a working fluid. The resulting powder was consolidated by the spark plasma sintering (IPS) method using the spark plasma sintering system SPS 25-10 (Thermal Technology, USA). Mechanical processing of sintered samples was carried out on an automatic high-precision desktop cutting machine "Accutom-5" and a grinding and polishing machine "LaboPol-5".

Results. It has been experimentally established that high-chromium alloys from 12X17 alloy particles dispersed by electroerosion obtained by spark plasma sintering have the following characteristics: equilibrium state with submicron and nanoscale grain; the main elements in the alloys are Fe, Cr and C; the main phases are Cr,Cr7C3 and FeCr0.29C0.06; porosity 0.27%; microhardness 555 HV0.2.

Conclusion. Based on the conducted experimental studies aimed at studying the structure and properties of sintered samples from electroerosive high-chromium powders obtained in kerosene, the high efficiency of using spark plasma sintering technology is shown, which provides a uniform heat distribution over the sample, controlled porosity and high physical and mechanical properties with a short working cycle time and grain growth suppression.

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