As a result of pulsed action of laser radiation on the surface of steel covered with a boron-containing covering, processes of formation of highly disperse boride phases occur in the fusion zone and cause a substantial increase of hardness of the surface.
When steel is boronized with pure boron carbide, the fusion zone has a highly disperse granular structure. When chromium is contained in the boron-containing covering, the fusion zone has a ledeburite-like dendritic structure.
The structure of the surface layer obtained by laser borochromizing has high thermal stability: after holding at 860°C and subsequent cooling in air there is no substantial decrease of hardness of the layer.
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Postnikov, V.S., Tomsinskii, V.S. & Polyakov, A.S. Structure formation in the surface layer of steel in laser borochromizing. Met Sci Heat Treat 32, 576–579 (1990). https://doi.org/10.1007/BF00700708
- Thermal Stability
- Surface Layer