Effect of Different Cooling Media After Solid Solution on the Microstructure and Yield Strength in a Ni-Al Alloy During
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NI-BASED superalloys possess exceptional combinations of high-temperature strength, toughness, inherent oxidation and hot corrosion resistance and are thus widely used in aircraft, power-generation turbines and rocket engines.[1–3] During the manufacture of Ni-based superalloys components, different heat treatments are usually used to obtain optimal mechanical properties suitable for the application by tailoring the size, distribution and morphology of the microstructures in Ni-based superalloy.[4,5] The common heat treatments include solid solution, aging and so on. Up to now, numerous experimental and theoretical investigations focusing on the effect of solid solution and aging temperature/time on different properties of Ni-based
YAN LIN, GUODONG LI, MING WEI, JIANBAO GAO, and LIJUN ZHANG are with the State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, P.R. China. Contact e-mail: [email protected] Manuscript submitted March 17, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
superalloys have been reported.[6–8] In fact, either in laboratory experiments or in industrial manufactures, one cooling medium like water quenching (WQ), air cooling (AC) or furnace cooling (FC) should be chosen after solid solution. Such cooing medium has a genetic effect on the evolution of the microstructure during the subsequent aging process and then the properties of the final Ni-based superalloys.[9] However, there is little research work on the effect of different cooling media in the literature. Therefore, it is very meaningful to remedy this situation. Systematic experimental investigations are typical labor- and money-consuming. As the rapid development of computational material science, the underlying computation modeling/simulation may serve as an effective and efficient way to investigate microstructural evolution as well as predict the correlative properties in materials during the preparation and service processes.[10–12] For the past decades, the phase-field simulation coupling with the accurate CALPHAD thermodynamic databases[13] has become one effective approach to realize the quantitative simulation of microstructure evolution, i.e., in Ni-based superalloys during different preparation processes.[14–18] Meanwhile,
the strengthening models[19–21] can predict the mechanical properties of the materials with the microstructure information, including grain size, its distribution, phase fraction and compositions, which can be also provided by the quantitative phase-field simulations. Thus, it is very promising to effectively establish the ‘‘composition/ process—microstructure—property’’ relation for the target materials by combining the quantitative phasefield simulation with the strengthening model. Consequently, a binary Ni-Al alloy, Ni-15.9 at. pct Al is chosen as the target in the present work, and the major aims are (i) to perform the experimental investigation of the effect of different cooling media, including WQ, AC and FC, after solid solution on the microstructure and yield streng
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