Article
Materials Science, Multidisciplinary
Shamil Mukhtarov, Dmitry Karyagin, Artem Ganeev, Rishat Zainullin, Ruslan Shakhov, Valery Imayev
Summary: The effects of forging and heat treatment variables on microstructure evolution and mechanical properties were studied in a Re-bearing nickel base superalloy prepared via powder metallurgy. The properly balanced mechanical properties were reached for a certain grain size of the alloy.
Article
Chemistry, Physical
J. M. Bai, H. P. Zhang, X. Y. Li, J. T. Liu, Q. S. Sun, C. S. Liu, Y. W. Zhang
Summary: This study conducted creep rupture tests on powder metallurgy superalloys with various Ta additives to further understand the effect of Ta on creep damage. The results showed that multiple crack propagation and damage mechanisms could occur under the same creep condition, and the addition of Ta could alter the size of these different fracture mode areas. However, the effects of Ta changed significantly under different creep conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
S. D. Gaikwad, Polasani Ajay, Vikram V. Dabhade, S. V. S. Narayana Murty, Sushant Manwatkar, U. Prakash
Summary: In this study, powder forging was used to consolidate a mechanically alloyed Ni-based ODS powder. The forged slab achieved near full density, ultra-fine grain size, and uniform distribution of oxide particles, leading to enhanced mechanical properties at room and elevated temperatures. The powder forging route can serve as an alternative consolidation technique for powder metallurgy ODS superalloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Rafael Casas, Rafael Sancho, Monica Campos, Francisco Galvez
Summary: This study investigates the effect of temperature on the high-strain-rate response of two powder metallurgy cobalt-based superalloys through dynamic uniaxial compression tests. The experimental results show strain-rate sensitivity and thermal softening effect at high temperatures, as well as a positive stress peak. A Johnson-Cook-type constitutive model successfully describes the flow stress as a function of temperature and predicts the behavior of the alloys within a wide range of temperatures through simulation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
John Boswell, Jonathan Jones, Nicholas Barnard, Daniel Clark, Mark Whittaker, Robert Lancaster
Summary: This study investigates the effects of crystal structure and heat treatment on the performance of LPBF Haynes 282 superalloy. By varying processing variables and heat treatment methods, the material structure was successfully homogenized, improving material isotropy. The research provides important insights for producing more reliable aerospace materials using LPBF technology.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
You Wu, Haozhi Zhao, Jikang Li, Yuanyuan Zhang, Jiantao Liu, Tong Liu
Summary: A new heat treatment processing, high temperature pre-precipitation treatment (HTPT), has been developed to achieve serrated grain boundaries and fine gamma' precipitates in powder metallurgy nickel-based superalloys. The effects of HTPT conditions on the microstructure have been systematically characterized.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
I. L. Svetlov, D. V. Zaitsev, M. M. Karashaev, A. I. Epishin, N. V. Petrushin
Summary: Specimens from a Russian nickel-base superalloy VZh178P, manufactured through powder metallurgy, were tested for their tensile and creep strength. It was found that stacking faults and microtwins were formed during plastic deformation of the alloy in both cases. Creep testing at 750 degrees C caused segregation of alloying elements, resulting in the formation of TCP particles.
PHYSICS OF METALS AND METALLOGRAPHY
(2023)
Article
Materials Science, Multidisciplinary
Mingtu Jia, Yousef Alshammari, Fei Yang, Leandro Bolzoni
Summary: The high cost of titanium alloys can be reduced by using alternative manufacturing techniques and cheap alloying elements. In this study, a cheaper alloy, Ti-5Al-2.5Fe, was produced using powder metallurgy and hot thermomechanical deformation. Annealing of the forged Ti-5Al-2.5Fe alloy improves both its strength and ductility, with longer annealing times resulting in higher gains. Additionally, annealing is more beneficial for improving ductility rather than strength in the powder-forged Ti-5Al-2.5Fe alloy.
Article
Materials Science, Multidisciplinary
Seth Griffiths, Hossein Ghasemi-Tabasi, Anthony De Luca, Joanna Pado, Shreyas S. Joglekar, Jamasp Jhabvala, Roland E. Loge, Christian Leinenbach
Summary: The removal of Hf has been shown to have a positive effect on improving the performance of the CM247LC alloy, helping to reduce strain age cracking susceptibility, but also leading to a slight decrease in hardness.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
Xian-Zong Wang, Yuhui Jiang, Yanfei Wang, Chengping Ye, Cheng-Feng Du
Summary: This study investigates the tribocorrosion behaviors of three nickel-based superalloys in 3.5 wt% NaCl solution under different polarization states. The results show that the composition of the tribofilms strongly depends on the alloy compositions and is significantly affected by the polarization potentials. Fe oxide contributes to the main mass loss of the alloys.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Etienne Martin, Arunkumar Natarajan, Srikanth Kottilingam, Rasim Batmaz
Summary: This study examines the advantages and disadvantages of using BJAM to produce high gamma' Ni-based superalloys. During the sintering process, the formation of HfO2 and Ta-rich carbides along prior particle boundaries was observed, impacting the mechanical properties of the material.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Feng Liu, Zexin Wang, Liming Tan, Xiangyou Xiao, Yunping Li, Xia Li, Hua Zhang, Lilong Zhu, Liang Jiang, Yong Liu
Summary: In this study, the high temperature creep properties of three newly developed P/M superalloys with fine grains were investigated under different temperature and stress conditions. The results showed that cracks were more likely to initiate at grain boundaries, and the movement of dislocations in grains was influenced by testing conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Alessandro Sergi, Raja H. U. Khan, Moataz M. Attallah
Summary: The characteristics and purity of powders significantly influence the properties of Ni-base superalloy parts produced through NNS PM HIP process. IN625 powders produced by different atomisation routes showed differences in microstructure and precipitates after HIPping. Among the four powders, PA HIPped IN625 exhibited the best balance of properties and matched that of wrought IN625 material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Shanshan Sun, Qing Teng, Yin Xie, Tong Liu, Rui Ma, Jie Bai, Chao Cai, Qingsong Wei
Summary: Nickel-based superalloys exhibit severe cracking tendencies during laser powder bed fusion (LPBF), impeding their widespread application in aerospace. A two-step heat treatment process was proposed to obtain crack-free components with desirable mechanical properties, showing improvements in tensile strength and ductility after the treatment. The microstructure development and correlation with tensile properties were systematically revealed, providing valuable insights for industrial applications.
ADDITIVE MANUFACTURING
(2021)
Article
Metallurgy & Metallurgical Engineering
L. Bolzoni, M. Jia, F. Yang
Summary: In this study, the effect of thermomechanical deformation temperature on the properties of the Ti-5Al-2.5Fe alloy produced from elemental powders was investigated. The research also analyzed the impact of microstructure modification through heat treatments on the properties of forged billets. The study demonstrated that powder forging can be successfully used to manufacture alpha+beta Ti alloys, with forging temperature significantly influencing the material's mechanical behavior, as lower temperatures result in stronger but less ductile material. Post-processing via solution treatment plus aging generally improves the Ti-5Al-2.5Fe alloy's mechanical properties, especially in terms of ductility, without compromising strength.
