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An experimental approach was designed to understand dendrite fragmentation of atomized droplets deposition in spray materials, and to study the relationship between dendrite fragmentation behavior and subsequent microstructural evolution. A Gleeble 3500 physical simulator was used to create controlled thermal shock conditions in solid-liquid mixtures of Superalloy GH4169 and High Speed Steel (HSS)...
The influence of solution treatment on grain size and pinning effects of the second phase on grain growth in spray formed superalloy GH742y were investigated by OM, SEM, TEM, DSC, phase extraction and XRD. The results indicates that the limiting ultimate grain size is about 40 μm. The equilibrium γ′ solvus temperature is determined to be about 1130 °C. Nb- and Ti-rich carbonitrides have good thermal-stability...
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