Preparation of ultrafine-grained GH4169 superalloy by high-pressure torsion and analysis of grain refinement mechanism

Luo, Junting; Yu, Wenlu; Xi, Chenyang; Zhang, Chunxiang; Ma, C.

doi:10.1016/j.jallcom.2018.10.385

Cited by 49 publications

(9 citation statements)

References 20 publications

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Section: Introductionmentioning

confidence: 99%

“…Due to their excellent durable strength and corrosion resistance at elevated temperatures, nickel-based alloys are often employed in aerospace, nuclear energy, and chemical industries [1][2][3]. Hot deformation is the optimum way to improve the strength of nickel-based superalloys [4][5][6][7][8]. Due to the complex microstructure and mechanical property evolutions, the optimization of the hot processing parameters of nickel-based alloys is the research interesting over the world [9].…”

Section: Introductionmentioning

confidence: 99%

“…The hot-deformation process of nickel-based alloys is accompanied by work hardening (WH), dynamic recovery, and recrystallization (DRV/DRX) [12,13]. The hot deformation parameters and initial microstructure will determine the final mechanical properties of nickel-based alloys [2,3,12,14]. Therefore, constitutive models have been established to describe the hot deformation behaviors of nickel-based alloys under various working conditions.…”

Section: Introductionmentioning

confidence: 99%

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The hot deformation behaviors and constitutive modeling of Hastelloy C276

Jiang²,

Deng³

et al. 2023

Mater. Res. Express

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Hastelloy C276 is widely used in the new generation of nuclear power plants, and hot deformation is the optimum way to form the C276 part. In this investigation, the hot deformation and constitutive modeling of Hastelloy C276 alloy are researched, and the processing maps are drawn. The results show that strain rate and hot deformation temperature have remarkable impacts on the deformation behaviors of the Hastelloy C276 alloy. The yield behavior and the flow stress are predicted based on the Arrhenius constitutive equation, and the correlation coefficients are 0.9613 and 0.9837, indicating the high prediction ability of the established constitutive equation. Rising the temperature can decrease the unstable deformation area, and the studied alloy can be deformed at low strain rates. With the increased strain rate, flow localization occurs, which is not suitable for hot deformation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The hot deformation behaviors and constitutive modeling of Hastelloy C276

Jiang²,

Deng³

et al. 2023

Mater. Res. Express

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“…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]. Ni esaslı süper alaşımlar içerisinde ise Inconel 625 zorlu yüksek sıcaklık dayanımları sebebiyle havacılık ve uzay endüstrisinde kullanılan ve ticari olarak temin edilebilen Ni bazlı süper alaşımların en yaygın olanıdır [20].…”

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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“…Severe plastic deformation (SPD) can effectively refine the internal structure of the material by applying large shear strain to produce UFG materials with large angular grain boundaries, and the grain size can be refined to several hundred nanometers. SPD methods including equal channel angular pressing (ECAP) [6], high pressure torsion (HPT) [7], accumulative roll bonding (ARB) [8], and cyclic extrusion compression (CEC) [9] are therefore employed to produce UFG materials. SPD can significantly increase the density of metals and alloys, eliminate internal defects in materials, and make it difficult to cause pores and pollution in machining.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic compound cutting on the microstructure and properties of formed chip

Sun

Jiao

Niu

et al. 2022

Int J Adv Manuf Technol

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Sever plastic deformation (SPD) with high strain rate can increase the material dislocation density, reduce the grain size and improve the mechanical properties. In this paper, ultrasonic compound cutting (UCC) was proposed to improve the efficiency of preparing ultra-fine grained (UFG) pure copper by sever plastic deformation methods. The motion characteristics and strain rate model of UCC were analyzed, and it was concluded that ultrasonic vibration can increase the strain rate in the primary shear zone. According to the 3D FEM equivalent model of UCC, the UCC and traditional compound cutting (TCC) were compared and analyzed from the perspective of strain rate. The simulation results show that ultrasonic vibration can significantly increase the strain rate of chip. The microstructure and mechanical properties of pure copper chip were studied by using a self-developed machining device. The experiment results show that the grain refinement, dislocation density and micro-hardness of pure copper chip were significantly improved in UCC. When the ultrasonic amplitude is 3 μm, the UCC chip grains are about 2.66 μm and the hardness reaches 124 HV, which is about 8% higher than the hardness of TCC chip. The findings of this research provide an important reference for machining UFG pure copper with enhanced mechanical properties.

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Preparation of ultrafine-grained GH4169 superalloy by high-pressure torsion and analysis of grain refinement mechanism

Cited by 49 publications

References 20 publications

The hot deformation behaviors and constitutive modeling of Hastelloy C276

The hot deformation behaviors and constitutive modeling of Hastelloy C276

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

Effect of ultrasonic compound cutting on the microstructure and properties of formed chip

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