Abstract
It is shown that after surface saturation with boron and copper of U8 steel samples, a borided diffusion layer with a thickness of 210 μm with a common needle-like structure is formed. The properties of diffusion layers, including the distribution of microhardness and chemical elements over the layer thickness is studied. It is established that the diffusion layer formed on the surface of U8 steel after borocoppering has a two-phase structure of outer FeB and Fe2B on the border with the base metal. The latter phase dominates over the first one in volume. The maximum value of microhardness is 1900 HV.
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