The Application of Differential Scanning Calorimetry to Investigate Precipitation Behavior in Nickel-Base Superalloys Under Continuous Cooling and Heating Conditions
نویسندگان
چکیده
A suite of experimental tools and fast-acting, numerical-simulation techniques was used to quantify the precipitation behavior three nickel-base superalloys: IN-100, LSHR, 718. Experimental methods comprised differential scanning calorimetry (DSC) establish specific heat as a function temperature selected direct-resistance heating trials (using Gleeble® machine) obtain samples for microstructural analysis. For DSC experiments, each alloy cooled at prescribed constant rate (between 5 20 K/min) after an initial soak/equilibration in high-temperature, single-phase (supersolvus) regime. On-heating beginning ambient were also performed on 718 different starting conditions: super-δ-solvus solution treated water quenched (denoted ST), aged (STA), overaged (STOA). results, revealing thermal signatures associated with kinetics γ′ (IN-100, LSHR) or γ″ (718), interpreted using previously-developed fast-acting routine that treats concurrent nucleation, growth, coarsening, dissolution. these simulations, special attention paid various thermo-kinetic input parameters including equilibrium solvus-approach curves, bulk free energies transformation, matrix-precipitate interface energies, effective diffusivities. γ-γ′ superalloys (IN-100 LSHR), estimates precipitate volume fraction from specific-heat data revealed semi-quantitative agreement simulation predictions. γ-γ′-γ″ superalloy predictions fractions converted showed direct measurements.
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ژورنال
عنوان ژورنال: Metallurgical and Materials Transactions
سال: 2021
ISSN: ['1073-5623', '1543-1940']
DOI: https://doi.org/10.1007/s11661-021-06362-x