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Analysis of Phase Transformation in Nickel-Base Alloy after Ageing

The aim of the performed tests was to analyse the precipitation processes in the 23Cr–45Ni–6W–Nb–Ti–B (HR6W) alloy based on nickel. The examined material was subjected to the process of long-term isothermal annealing at 700 ◦C, for various time periods of up to 10000 h. The scope of the tests included: structural tests using scanning electron microscopy, the analysis of the precipitation processes with the use of X-ray phase analysis and electron diffraction with transmission electron microscopy. The tests showed that only MX-type precipitates occurred in the analysed alloy in the as-received condition, whereas the long-term annealing contributed to the precipitation of secondary phases of M23C6 carbides and the Laves phase.