Abstract：The contents of W and Mo in K4208 high temperature alloy are relatively high. The carbide and intermetallic phases are usually formed. In order to qualitatively and quantitatively analyze the precipitated phases in K4208 high temperature alloy, the proper electrolytic conditions were selected in experiments: the electrolyte was 10g/L lithium chloride-40g/L sulfosalicylic acid-5% (V/V) glycerol methanol solution; the current density was 0.04-0.06A/cm2; the electrolysis temperature was between 0℃ and -5℃. The precipitated phases were separated from alloy matrix by electrolytic extraction method. The separation methods of precipitated phases were studied. The carbides were dissolved and the single new phase was obtained. The lattice constant of precipitated phases was measured by X-ray diffraction (XRD). The size distribution of precipitated phases was measured by X-ray small angle scattering method. The morphology and element composition were analyzed by scanning electron microscope (SEM). The elemental content and total content of precipitated phases were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that the extraction amount of precipitated phases was significantly affected by the electrolytic conditions. The K4208 high temperature alloy contained four precipitated phases, i.e., new phase, γ′ phase, M6C phase and M12C phase. The stability of new phase was high and it was insoluble in 6% (V/V) H2SO4-20% (V/V) H2O2 solution and 20% (V/V) HCl ethanol solution, and partially dissolved in 50% (V/V) H2SO4. M6C phase and M12C phase were blocky with relatively small particle size. The average particle size of mixed phase was 170.7nm. The new phase was lamellar with large particles, and the average particle size was 216.6nm.
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