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Article
Materials Science, Multidisciplinary
Z. P. Zhang et al.
Summary: In this study, a novel fourth-generation nickel-based single crystal superalloy was vacuum brazed using a new type of Co-based filler alloy at different temperatures. The effects of the brazing temperature on the microstructure and mechanical properties of the brazed joint were investigated. The results showed that with increasing brazing temperature, the volume fraction of borides and gamma' phase in the joint changed, affecting the tensile strength of the joint.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Dou Xuezheng et al.
Summary: This paper studied the low cycle fatigue properties of the DD412 single crystal alloy at 760 degrees C in [001], [011], and [111] orientations. A correlation between low cycle fatigue properties and orientation was found, and the microstructure evolution and fatigue failure mechanism were investigated, providing a solid theoretical foundation for the engineering application of the DD412 single crystal alloy.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Wenwen Zhang et al.
Summary: In this study, the effect of coupling hot deformation and heat treatment on the morphology of gamma' precipitates in GH4742 superalloy was investigated. The results show that after subsolid solution heat treatment and rapid cooling, tri-modal size distribution of gamma' precipitates was observed, with dendritic primary gamma' precipitates. The morphology of gamma' precipitates within deformed grains is influenced by the accumulation of dislocations and other defects. The maximum size of columnar gamma' precipitates is obtained at high-angle grain boundaries. The stable morphology and size of gamma' precipitates at sigma 3 twin boundaries were also observed. These findings provide important insights for the design and optimization of Ni-base superalloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jianli Zhou et al.
Summary: This study investigates the initiation and propagation mechanism of fatigue microcracks in a nickel-based single crystal at temperatures of 950℃ and 1050℃ using an in-situ scanning electron microscope high temperature fatigue test system. At 950℃, the deformation of the alloy is controlled by slip and crack shear occurs at the γ/γ' interface, showing Stage I mode. At 1050℃, crack tearing happens parallel to the loading direction and perpendicular to the γ/γ' interface, exhibiting Stage II mode, and then transitions to Stage I during the accelerating stage. The deformation mechanism of fatigue cracking at the two temperatures is compared, and the influence of microstructure defects on fatigue crack behavior is discussed. The results demonstrate that the propagation of microcracks below 100μm shows significant fluctuations, which are closely related to the microstructure and the development stage of the fatigue crack.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Qian Yin et al.
Summary: This study simulated the plastic deformation and mechanical properties of nickel-based single crystal two-phase alloys under different crystal orientations using molecular dynamics. It found that different orientations have significant effects on the alloy's performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Guangyan Wang et al.
Summary: This study investigates the microstructure evolution and deformation mechanism of a [111]-oriented nickel-based single-crystal superalloy at 980 degrees C/186 MPa through creep measurement and microstructure observation. The results reveal that the material undergoes phase transformation and dislocation slip during creep, leading to creep fracture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Wenchao Yang et al.
Summary: This study comparatively investigated the effect of Ru addition on the microstructure and mechanical properties of two nickel-based single crystal superalloys after standard heat treatment. The results showed that Ru addition enhanced the hardness and elastic modulus of the alloys.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Jinshan He et al.
Summary: The strain-control low cycle fatigue behavior of a gamma'-strengthened Co-based single-crystal superalloy was investigated at 900 degrees C. The fatigue life of the alloy was longer than conventional Co-based superalloys due to the strengthening provided by the gamma'. Slip bands consisting of many tangled dislocations and stacking faults continuously cut through the gamma' phase with strain amplitudes above the elastic limit, which is the main deformation mechanism. Crystallographic fracture occurred due to the planar slip deformation mode. In contrast, few dislocations were observed in the sample cycled below the elastic limit, and severe oxidation at the surface introduced Co3W/gamma layer and recrystallization leading to mode I crack.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Wanshun Xia et al.
Summary: The study investigates the creep properties of a 4th generation nickel-based single crystal superalloy (Ni-SX) at different temperatures, highlighting the impact of topologically close-packed (TCP) phase formation and dendritic segregation on fracture mechanisms.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
Fei Li et al.
Summary: This paper presents a novel modeling framework for predicting fatigue life performance with varying film cooling holes (FCHs). In-situ crack propagation tests were carried out on nickel-based single-crystal plate specimens with different drilling FCHs, and the initial fatigue quality of these FCHs was quantitatively evaluated and verified. A novel EIFS value and a fatigue-crack growth function were proposed to effectively describe the crack growth behavior. The fatigue-life prediction results were in significant agreement with the experimental results within a specified range.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Aerospace
Bin Zhang et al.
Summary: This study investigates the uniaxial ratcheting behavior and low cycle fatigue failure mechanism of nickel-based single crystal superalloy DD6 with [001] orientation through stress-controlled LCF tests. It is found that DD6 exhibits significant ratcheting behavior under stress-controlled LCF loading, with significantly shorter LCF lifetimes compared to strain-controlled loading. An improved crystal plasticity constitutive model is developed to address the inaccurate prediction of ratcheting behavior, showing good agreement with experimental data.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Chemistry, Physical
Shuning Gu et al.
Summary: The study reveals that the creep life of different parts of the original casting blade varies due to differences in microstructure and morphology. The creep property of standard parts is better than original casting blades, with the creep life order from small to large being: CVS, DP, LE, CCS, TT. Improved two-parameter creep constitutive model was used to simulate the difference in creep properties resulted from different parts in a turbine blade, providing valuable insights for turbine blade design and directional solidification forming process improvement.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Liu Liu et al.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2019)
Article
Nanoscience & Nanotechnology
Yanchao Zhao et al.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Engineering, Mechanical
J. J. Wang et al.
INTERNATIONAL JOURNAL OF FATIGUE
(2019)
Article
Chemistry, Physical
Jian Lan et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
Liu Liu et al.
MATERIALS & DESIGN
(2017)
Article
Engineering, Mechanical
D. Hollaender et al.
INTERNATIONAL JOURNAL OF FATIGUE
(2016)
Article
Engineering, Mechanical
W. Maktouf et al.
INTERNATIONAL JOURNAL OF FATIGUE
(2016)
Article
Materials Science, Multidisciplinary
Chantal K. Sudbrack et al.
Article
Materials Science, Multidisciplinary
C. M. F. Rae et al.
Article
Materials Science, Multidisciplinary
D Rodney
