Abstract
AbstractIn order to make cast iron usable for highly stressed components or tools, the duplex treatment of electron beam (EB) remelting or cladding using a nickel‐based additive (a supporting layer without graphite) and boriding (a functional layer) is considered to have extraordinarily high potential for realizing the necessary division of functions. Due to the high process temperatures during boriding, the electron beam‐treated layers should have sufficient thermal resistance to fulfil the required supporting function for the boride layers. However, this could only be confirmed for the cladded layers. This paper deals with comparative investigations on the effects of single and combination treatments performed on the cast iron surface on the material's wear (dry pin‐on‐disc tests) and corrosion behaviour (potentiodynamic measurements in an aerated sodium chloride solution and in sulphuric acid). After testing, and in particular in terms of corrosion resistance, the duplex treatment of electron beam cladding+boriding showed a clear improvement over single treatment. With regard to wear performance, however, only a marginal improvement could be determined. This was highly dependent on the boride layer thickness and the loading conditions.
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