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  • Microstructure and residual stress analysis after steel and laser alloying
    Grum, Janez, 1946- ; Žnidaršič, Matjaž, 1964-
    The paper treats laser alloying by remelting of the parent metal and the filler material. With the selection of the filler material in powder form, the influence of silicon carbide in powder form on ... the efficiency of melting and alloying was studied too. The SiC powder is a readily available material known for numerous applications due to its high hardness and corrosion resistance. In laser alloying experiments, low-carbon steel was used. When the SiC powder is added in laser remelting, it completely disintegrates into Si and C which then dissolve in the molten pool. The remelted layer of the parent metal will pick up carbon whereas silicon will make a solution. Self-through-hardening of the thin remelted and alloyed surface layer considerably increases the microhardness of the surface layer, i.e., to more than 800 HV_0,1. The increased hardness results in a considerable increase in wear resistance of the material. During the melting process of the two materials, fast and efficient alloying, i.e., remelting by dissolving C and Si, can be ensured; therefore, the surface practically need not to be machined after the process. Because of the high hardness and good surface quality only fine grinding may be used if needed. As regards residual stresses, they are favourable since in the thin surface layer even compression residual stresses occur, which then slowly and uniformly transform into tensile residual stresses.
    Vir: [CIM 2002] : computer integrated manufacturing and high speed machining (Str. IV-089 - IV-097)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2002
    Jezik - angleški
    COBISS.SI-ID - 5251099

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