On the Rate Dependence of Precipitate Formation and Dissolution in a Nickel-Base Superalloy

Abstract The temporal dependence of $$\gamma '$$ γ ′ dissolution in the polycrystalline Ni-base superalloy RR1000 has been studied with implications to thermo-mechanical processing. A resistivity-based method using an electro-thermal mechanical testing (ETMT), which overcomes drawbacks associated other approaches, such as calorimetry, dilatometry, and diffraction, used explore effect transient isothermal thermal cycles. This is supplemented by DICTRA numerical models that simulate diffusion within $$ phase up /\gamma / interface. It demonstrated affected heating rate well precipitate size. Below a threshold $$\sim ∼ 0.1 $${^\circ }$$ ∘ C s $$^{-1}$$ - 1 , kinetics are marginally affected, however, sensitive microstructure. role size during governed flux at interface, inversely proportional argued simulations predict constitutional liquation rapid altering width computation domain match average population will yield inaccurate predictions. influence on nucleation undercooling, subsequent cooling, also addressed. With increasing rates, local solvus temperature shifted progressively higher temperatures. Unless complete occurs prior erroneous interpretations undercooling can arise.