Article
Metallurgy & Metallurgical Engineering
Kai-meng Wang, Hong-yang Jing, Lian-yong Xu, Lei Zhao, Yong-dian Han, Hai-zhou Li, Kai Song
Summary: The study investigated the cyclic deformation behavior and microstructure evolution of a nickel-based superalloy, revealing cyclic hardening and softening phenomena under various strain amplitudes. Microstructure analyses showed different distribution patterns of carbides and changes in the size of the gamma' phase with increasing strain amplitudes.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Le Chen, Bing Zhang, Yan Yang, Tianli Zhao, Yi Xu, Qi Wang, Bin Zan, Jun Cai, Kuaishe Wang, Xi Chen
Summary: Nickel-based superalloy has excellent mechanical properties at high temperature, but the high deformation resistance, narrow deformation temperature range, and complex microstructure evolution of the alloy pose great challenges to its plastic deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
PeiZhi Yan, DongXu Wen, Yang Liu, Liang Huang, XiaoLi Yang, ZhiCheng Zhang, FuZe Xu, JianJun Li
Summary: The evolution of microstructure and 8 phase (Ni3Nb) in a nickel-based superalloy was studied using hot compression tests. The effects of deformation parameters on dynamic recrystallization (DRX), fracture behaviors, and dissolution mechanisms of 8 phase were characterized and discussed. The results showed that the fraction of DRX increased with increasing strain or decreasing strain rate, and two mechanisms were identified for the promoting effect of DRX on the fracture behaviors of 8 phase. Additionally, the distribution of Nb element tended to be uniform with further straining due to the diffusion channels provided by dislocations around the phase boundary.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Yong-Qiang Wang, Chao Yuan, Bing Zhang, Xin-Yu Gao, Shi-Chang Qiao, Xin Wen, Yi-Peng Chen, Feng-Zhen Wang
Summary: This study investigates the deformation mechanisms of GH3536 superalloy during loading by conducting tensile tests and interrupted experiments at different temperatures. The microstructure evolutions and dislocation densities of the alloy were studied using TEM and XRD. Deformation twins were observed at 77K, while deformation occurred solely by dislocation slip at 293K. The competition between the maximum flow stress and critical stress for twinning determines the deformation mechanisms of GH3536 alloy. Twinning provides an additional deformation mode, resulting in improved ductility and strength at 77K compared to 293K.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
W. W. Zhang, Y. Yang, Y. B. Tan, M. T. Zeng, M. Ma, S. Xiang, F. Zhao
Summary: Microstructure evolution and strengthening mechanisms of MP159 superalloy during room temperature rolling and cryorolling were investigated using XRD, EBSD, and HRTEM techniques. The results demonstrate that the cryorolled specimens exhibit finer grain size and higher dislocation density compared to the room temperature rolled specimens. Additionally, deformation nano-twins and L-C locks can be observed in both types of specimens. The strengthening mechanisms during room temperature rolling and cryorolling are mainly attributed to dislocation strengthening, grain refinement strengthening, and deformation nano-twins strengthening.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
P. Zhang, Y. Yuan, Z. H. Gao, J. Li, Q. Niu, X. B. Shi, Y. L. Zhou, Y. F. Gu
Summary: In this study, the variations in compressive yield strength and deformation modes of the nickel-based superalloy CM247LC were investigated. It was found that the yield strength of the alloy only fluctuates in a small range with temperature below 800°C, but decreases dramatically at higher temperatures. Microstructural observations revealed the presence of numerous substructures in the alloy at temperatures between 25 and 950°C, including anti-phase boundary-coupled dislocation pairs, stacking faults, extended stacking faults, and microtwins. At 1000°C, plastic deformation involved dislocations bypassing gamma' particles via climb, as well as APB shearing and shearing of gamma' particles by partial dislocations. The correlation between flow stress and deformation modes was discussed based on the microstructural observations.
PHILOSOPHICAL MAGAZINE
(2022)
Article
Materials Science, Multidisciplinary
Jiaao Liu, Weihong Zhang, Feiqiang Mei, Xin Xin, Yichao Cao, Chongwei Zhu, Qingao Liu, Xuhui Zhu, Wenru Sun
Summary: The microstructure evolution and work hardening behavior of Haynes 214 superalloy under uniaxial compression tests were investigated. The alloy exhibited a four-stage work hardening response similar to low stacking fault energy (SFE) face-centred cubic alloys. The work hardening rate was influenced by dislocation movement, appearance of high angle boundaries (HAGBs), and generation of deformation twins.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yeqing Cai, Song Xiang, Yuanbiao Tan
Summary: The dynamic recrystallization behavior of MP159 superalloy was studied through hot compression tests, identifying the optimal hot processing region and investigating the influence of processing parameters on microstructure evolution. Deformation twins formed during hot deformation can accelerate dynamic recrystallization.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Christiane Kienl, Fernando D. D. Leon-Cazares, Catherine M. F. Rae
Summary: This study discusses the deformation mechanisms during high temperature compression tests of the Ni-base superalloy ATI 718Plus (R). Deformation twins were observed in deformed grains at various temperatures and strain rates using transmission electron microscopes (TEM). The low stacking fault energy of the alloy was found to cause the formation of deformation twins. Additionally, early stages of twin formation were captured, including emission of twinning partials from grain boundaries and the formation of partials through cross-slip events.
Article
Materials Science, Multidisciplinary
Evan B. Raeker, Kira M. Pusch, Stephane A. J. Forsik, Ning Zhou, Austin D. Dicus, Qing-Qiang Ren, Jonathan D. Poplawsky, Michael M. Kirka, Tresa M. Pollock
Summary: The cracking behavior of a CoNi-base superalloy fabricated via laser powder bed fusion was studied in relation to carbon and boron content. It was found that increasing the boron content led to severe cracking, while compositions with higher carbon and lower boron showed minimal cracking. Scan electron microscopy showed evidence of solidification cracking mode, and differential thermal analysis revealed decreased incipient melting temperature for high-boron composition. The simulations of solidification cracking susceptibility and atom probe tomography measurements provided valuable insights for designing new superalloys for additive manufacturing.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Kaili Feng, Tianmin Shao
Summary: This study investigates the tribo-induced surface structure of nickel-based superalloy at high temperature and its influence on friction and wear performance. The results show that not only the properties of the tribo-layer, but also the structure of the substrate alloy play a crucial role in governing the friction and wear performance of the alloy. The wear resistance of the alloy decreases as the temperature increases due to the deterioration of the supporting effect of the substrate alloy to the tribo-layer.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Emil Eriksson, Joel Andersson, Magnus Hornqvist Colliander
Summary: This study examines the effect of grain boundary carbides on dynamic recrystallization during hot compression of Ni-base superalloy Haynes 282, and indicates that carbides do not significantly influence the process. The carbide solvus temperature is not a critical limit during thermomechanical processes as well.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Xingyu Pan, Chonglin Jia, Chunlei Qiu
Summary: The demand for increased aircraft engine efficiency necessitates the development of high-performance heavily-alloyed nickel-based superalloys. This study introduces hot extrusion as a transitional process between casting and forging to process a newly developed and highly alloyed nickel-based superalloy, GH4151. The results demonstrate that hot extrusion facilitates successful processing of GH4151 ingots during subsequent forging, resulting in improved stress rupture properties. Additionally, the study reveals a continuous decrease in stress rupture lifetime with increasing temperature and stress level, alongside an increase in elongation with temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yaohui Song, Yugui Li, Huaying Li, Guanghui Zhao, Zhihui Cai, Mingxu Sun
Summary: The hot deformation behavior of nickel-base superalloy was investigated and models for strain compensation Arrhenius and recrystallization fraction were established. The results showed that the recrystallization fraction increased with the increase of deformation temperature, while it first decreased and then increased with the increase of strain rate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Wei Liu, Hua Zhang, Zhiling Liu, Jingjing Ruan, Hailiang Huang, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: This study investigates the hot-working characteristics, microstructure evolution, and dynamic recrystallization of the hot isostatically pressed (HIPed) FGH4096 superalloy at various temperatures and strain rates. A new constitutive equation is developed to accurately predict flow stresses under different deformation conditions. Hot working maps are established to optimize the hot working parameters. Different recrystallization behaviors are observed in different regions, with deformation temperature having a greater influence than strain rate on dynamic recrystallization. Adiabatic shear bands, voids, and cracks along grain boundaries contribute to flow instability in the instability regions. An optimized hot working window is determined based on the hot working map and microstructure evolution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
