Abstract
Microstructural dependence of continuous and discontinuous Cr-rich precipitation kinetics in Ni-45%Cr alloys on composition and thermal history was investigated by microstructure characterization and differential scanning calorimetry (DSC). The results indicated that discontinuous precipitation was favored at low temperatures and high Cr contents, while continuous precipitation was favored at high temperatures. Activation energies estimated by Kissinger equation using DSC and microstructural evolution showed that Nb and B suppressed, but Zr promoted discontinuous precipitation. It provided a simple effective method to figure out the effect of additions on precipitation kinetics.
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