OBRABOTKA METALLOV

Abstract
The features of the structure formation in the surface layers of low carbon steel 20 after nonvacuum electron-beam deposition of iron- graphite powder mixture and subsequent electron-beam hardening are considered. It is shown that the thickness of the coating, formed during deposition, is 2.6 mm and its hardness reaches 5300 MPa. The subsequent electron-beam hardening enhances the micro-hardness up to 7000 ... 8000 MPa. Increase in hardness due to the formation of the high-strength fine-grained martensitic structure in the process of electron-beam hardening positively affects the tribological properties of materials. Coatings with the structure of a hypereutectoid steel formed after additional heat treatment have the greatest wear index.

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