Precipitate coarsening and its effects on the hot deformation behavior of the recently developed γ'-strengthened superalloys

Wu, Yuting; Li, Chong; Xia, Xingchuan; Liang, Hongyan; Qi, Qiqi; Liu, Yongchang

doi:10.1016/j.jmst.2020.06.025

Cited by 128 publications

(13 citation statements)

References 79 publications

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“…Owing to their excellent anti-corrosion/fatigue properties and strengths, powder metallurgy (P/M) superalloys are widely applied for manufacturing the turbine disks of aero-engines [ 1 , 2 ]. However, due to the high content of alloying elements and the internal defects in P/M superalloys, hot forming processes, for example, hot-extrusion and forging processes, are fairly complex [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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The dynamic recrystallization (DRX) features and the evolution of the microstructure of a new hot isostatic pressed (HIPed) powder metallurgy (P/M) superalloy are investigated by hot-compression tests. The sensitivity of grain dimension and DRX behavior to deformation parameters is analyzed. The results reveal that the DRX features and grain-growth behavior are significantly affected by deformation conditions. The DRX process is promoted with a raised temperature/true strain or a reduced strain rate. However, the grains grow up rapidly at relatively high temperatures. At strain rates of o.1 s−1 and 1 s−1, a uniform microstructure and small grains are obtained. Due to the obvious differences in the DRX rate at various temperatures, the piecewise DRX kinetics equations are proposed to predict the DRX behavior. At the same time, a mathematical model for predicting the grain dimension and the grain growth behavior is established. To further analyze the DRX behavior and the changes in grain dimension, the hot deformation process is simulated. The developed grain-growth equation as well as the piecewise DRX kinetics equations are integrated into DEFORM software. The simulated DRX features are consistent with the test results, indicating that the proposed DRX kinetics equations and the established grain-growth model can be well used for describing the microstructure evolution. So, they are very useful for the practical hot forming of P/M superalloy parts.

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Section: Introductionmentioning

confidence: 99%

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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“…That is γ′ particles tend to coarsen by consuming smaller precipitates in the thermal exposure to reduce the interface free energy [5]. When heated above the solution temperature, the coarsening behavior terminated and γ′ phases began to re-dissolve and the supersaturated solid solution re-formed.…”

Section: γ and γ′ Phasementioning

confidence: 99%

“…Many investigations have been focused on the γ′ precipitates, their evolution during heating or cooling in terms of size, shape, composition, volume fraction and lattice misfit with γ phase [5][6][7][8]. The grain boundary carbides also play an important role in the strengthening that can prevent or retard grain-boundary sliding and make the grain boundary stronger [9,10].…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution and Thermal Expansion Behavior of a γ′ Precipitated Ni-Based Superalloy by Synchrotron X-Ray Diffraction

Yan

Tan

Huang

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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The phase evolution and thermal expansion behavior in superalloy during heating play an essential role in controlling the size and distribution of precipitates as well as 2 optimizing thermomechanical properties. Synchrotron X-ray diffraction is able to go through the interior of sample and can be carried out with in-situ environment, thus it can obtain more statistics information in real time comparing with traditional methods, such as electron and optical microscopies, etc. In this study, in-situ heating synchrotron X-ray diffraction was carried out to study the phase evolution in a typical γ′ phase precipitation strengthened Ni-based superalloy, Waspaloy, from 29 °C to 1050 °C. The γ′, γ, M23C6 and MC phases, including their lattice parameters, misfits, dissolution behavior and thermal expansion coefficients were mainly investigated. The γ′ phase and M23C6 carbides appeared obvious dissolution during heating and re-precipitated when the temperature dropped to room temperature. Combining with the microscopy results, we can indicate that the dissolution of M23C6 leads to the growth of grain and γ′ phase cannot be completely dissolved for the short holding time above the solution temperature. Besides, the coefficients of thermal expansions of all the phases are calculated and fitted as polynomials.

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“…Bu yöntemlerin birbirlerine göre üstünlükleri vardı. Şöyle ki döküm yöntemi seri üretim için avantajlı bir üretim prosesi olmasına karşın döküm işlemindeki katılaşma çoğu zaman segregasyon ile sonuçlanır [3,4] [17]. Bu alaşımların uçaklardaki kullanım yerleri düşünüldüğünde havacılık motoru bileşenleri, gaz türbini sıcak uç bileşenleri gibi uçakların başlıca yapısal parçalarıdır [18,19].…”

Section: Introductionunclassified

Dövme ve Eklemeli İmalat Yöntemiyle Üretilmiş Inconel 625 Alaşımların Termal Yöntemle Hızlı Delinmesinde Elektrot Aşınmasının İncelenmesi

Ceritbinmez¹,

Günen

Gürol

et al. 2023

International Journal of Advances in Engineering and Pure Sciences

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Üretildikleri 1950’li yıllardan beri havacılık, uzay, nükleer, biyomedikal endüstrisi gibi ileri mühendislik uygulamalarında sıklıkla tercih edilen Inconel grubu alaşımların daha maliyet etkenli bir yöntem olan eklemeli imalat yöntemiyle üretilebilirliği son 20 yılda yoğun olarak çalışılmaktadır. Ancak, süper alaşımlar işlenebilirliği zor malzemeler grubunda olup, iletkenlikleri zayıf olduğundan bu alaşımların delinmesinde kullanılan elektrotlarda ciddi hasarlar meydana gelmektedir. Dahası, eklemeli imalat yöntemiyle üretilen bu alaşımların delinebilirliğinde kullanılan elektrotlardaki aşınmayı inceleyen sınırlı sayıda çalışma vardır. Bu amaçla bu çalışmada, dövme ve eklemeli imalat tekniği ile üretilmiş Inconel 625 alaşımların, EDM ile hızlı delik delme yöntemi kullanılarak 3 mm çapında pirinç elektrotlarla delinmesi neticesinde aşınan elektrotlarda oluşan aşınma miktarları incelenmiştir. Elektrot aşınması; iş parçası üzerinden ölçülen delik çapları ve kerf açıları dikkate alınarak analitik olarak ve deneylerde aşınan elektrotların hassas terazilerle tartılması ile fiziksel olarak tespit edilmiştir. Daha tok ve kararlı bir yapıda olan dövme Inconel malzemeyi işleyen elektrodun eklemeli imalat Inconel alaşımı işleyen elektroda göre % 108,33 daha fazla aşındığı tespit edilmiştir. Buna ilaveten, dövme Inconel iş malzemesinde elektrot aşınmasından kaynaklı kerf açısının eklemeli imalat Inconel malzemeye göre % 80,06 daha fazla olduğu görülmüştür.

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Precipitate coarsening and its effects on the hot deformation behavior of the recently developed γ'-strengthened superalloys

Cited by 128 publications

References 79 publications

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

Phase Evolution and Thermal Expansion Behavior of a γ′ Precipitated Ni-Based Superalloy by Synchrotron X-Ray Diffraction

Dövme ve Eklemeli İmalat Yöntemiyle Üretilmiş Inconel 625 Alaşımların Termal Yöntemle Hızlı Delinmesinde Elektrot Aşınmasının İncelenmesi

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