Article
Engineering, Mechanical
Shujing Shi, Yongsheng Li, Zhengwei Yan, Shuaige Yang, Yinfei Ju
Summary: By introducing the digitized image of SEM morphology into phase-field simulation, the rafting behaviors of the L12 gamma'-Co3(Al, V) phase and the creep properties of Co-5Al-14V (at.%) alloy under various strains were studied. It was found that uniaxial compressive strain improves microstructural stability and creep resistance. The creep resistance is higher when the alloy is in a state of equilibrium volume fraction of gamma' phase, and it increases in order of tensile strain, compressive strain, and shear strain. The study also revealed the correlation between slip system anisotropy and creep behaviors of Co-Al-V alloy under external strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Zixu Guo, Dawei Huang, Xiaojun Yan
Summary: In this study, a physics-based model is proposed to predict the gamma/gamma' microstructure evolution of single crystal superalloy at medium temperature and high stress level. The model considers multiple hardening mechanisms and is validated through creep fracture and interrupted tests, showing good agreement with the experimental results.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Mechanical
Jianwei Liang, Yan Peng, Wei Zhang, Jiapo Wang
Summary: The study on gradient loading creep behavior of nickel-based single crystal revealed that load and holding time significantly affect creep properties, with load changes causing instantaneous jumps in creep deformation and strain rate, while holding time mainly influencing the evolution of internal microstructure.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Nanoscience & Nanotechnology
Zhen Zhang, Shen Wang, Bailey Brown, I. Soner Cinoglu, Natasha Vermaak, Langhong Lou, Jian Zhang
Summary: This paper combines cyclic test results with microstructural observations to establish the conditions for macroscopic shakedown response of a second generation nickel-base single crystal superalloy under tension-torsion loadings at 600 degrees C. The deformation mechanisms in specimens exhibiting shakedown and ratchetting are identified and compared. Directions for future materials development to directly exploit shakedown in design are suggested.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Patxi Fernandez-Zelaia, Yousub Lee, Sebastien Dryepondt, Michael M. Kirka
Summary: Additive manufacturing has gained significant interest in recent years, but further research is needed for its widespread industrial adoption. This study presents a crystal plasticity model that includes non-Schmid effects for simulating the anisotropic creep behavior of additively manufactured materials. The model is calibrated using a probabilistic framework and an iterative sequential design strategy to determine the probability density of model parameters. As a case study, the model is used to investigate the behavior of randomly oriented equiaxed grain clusters in additively manufactured structures.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Piao Li, Wen Jiang, Shao-Shi Rui, Wei-xing Yao, Hui-ji Shi, Qi-nan Han, Jie Huang
Summary: The study reveals that the misorientation of nickel-base single crystal superalloy can affect its fatigue life, and the actual misorientation angle's impact on fatigue life has been quantified for the first time.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Kai-Shang Li, Run-Zi Wang, Guang-Jian Yuan, Shun-Peng Zhu, Xian-Cheng Zhang, Shan-Tung Tu, Hideo Miura
Summary: In this study, a numerical method based on CPFE was implemented to predict creep-fatigue crack initiation life, and a new life prediction approach was constructed by introducing fatigue and creep indicator parameters. Experimental validation showed high accuracy of the predicted model, providing a potential methodology for conservative creep-fatigue life evaluation in engineering applications.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Wanshun Xia, Xinbao Zhao, Liang Yue, Quanzhao Yue, Jiangwei Wang, Qingqing Ding, Hongbin Bei, Ze Zhang
Summary: The creep inconsistency between dendrite core and interdendritic region was investigated in a nickel-based single crystal superalloy, showing that higher elemental inhomogeneity leads to local strength deviation, while increased solid solution time can reduce overall inhomogeneity and relieve creep inconsistency.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Kwangsik Kwak, Tsuyoshi Mayama, Yoji Mine, Katsuhiko Ohishi, Tomonori Ueno, Kazuki Takashima
Summary: The anisotropy in the mechanical properties of 601 nickel-based superalloy fabricated using wire-arc additive manufacturing (WAAM) was investigated through multiscale tensile testing combined with crystal plasticity analysis. The study found that there was anisotropy in the fracture strain and work-hardening behavior of the millimeter-scale specimens composed of columnar grains, despite the yield stress being approximately constant. The micrometer-scale specimens, which were single crystals with dendrites, exhibited limited influence of dendrite formation on the yielding behavior of columnar grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Dong Wang, Yongsheng Li, Shujing Shi, Xiaoyuan Zhang, Zhengwei Yan
Summary: The study focused on the creep properties and rafting morphology of a Co-10 Al-9 W alloy at 1173 K, revealing that creep strain and strain rate increase with creep stress, leading to a shortened creep life. This indicates a correlation between creep behavior and stress level, providing insight into improving creep resistance through pre-rafted morphology in Co-base superalloys.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jinbin Chen, Jingyang Chen, Qinjia Wang, Yidong Wu, Qing Li, Chengbo Xiao, Shilei Li, Yandong Wang, Xidong Hui
Summary: This paper proposes an alternative approach to enhance the creep resistance of nickel-based single crystal superalloys by slight composition modification instead of increasing the Re content. Experimental results show that the addition of minor Ti can increase the quantity and size of precipitates, improve lattice misfit, and enhance the partitioning behavior of the alloy. The Ti-containing alloy exhibits significantly improved creep resistance, extended creep life, and a stronger dislocation strengthening mechanism.
Article
Materials Science, Multidisciplinary
Qing Miao, Wenfeng Ding, Weijie Kuang, Yucan Fu, Zhen Yin, Chenwei Dai, Lijie Cao, Hongcai Wang
Summary: The gradient microstructures of surface layer in single crystal nickel-based superalloy were produced by creep-feed grinding. The mechanical properties and room-temperature creep behavior were evaluated using nano-indentation technique. Results show higher hardness and elastic modulus in gradient structures, but regions with nanograins exhibited increased creep depth, indicating unfavorable creep behavior changes.
Article
Materials Science, Coatings & Films
Yuan Liu, Yi Ru, Heng Zhang, Yanling Pei, Shusuo Li, Shengkai Gong
Summary: This study investigates the complex interaction between PtAl bond coats and nickel-based single crystal superalloys, revealing the mechanisms of coating-assisted creep deterioration under different temperature and stress conditions. The findings shed light on the coat-superalloy interaction and may be useful in guiding the design of advanced coatings.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Optics
Quanfeng Xiao, Yuanming Xu, Xinling Liu, Rujian Sun
Summary: Femtosecond laser drilling was used to drill film cooling holes with different apertures on a [001]-oriented Ni-based single crystal superalloy. The anisotropic high-temperature creep behavior of the superalloy was investigated and a creep constitutive model was constructed based on crystal plasticity theory and finite element simulation. The drilling direction significantly affected the stress distribution and deformation mechanism, with drilling along [1 0 root 3] resulting in longer creep lifetime and enhanced creep resistance.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
S. J. Perry, N. D'Souza, D. M. Collins, B. Roebuck, H. B. Dong
Summary: This study investigates the influence of thermo-mechanical behavior and microstructure on recovery and recrystallization in single-crystal superalloys during casting and heat treatment. The temporal evolution of resistance was measured to track the process of recovery and recrystallization. The occurrence of subgrains and deformation twins preceded the recrystallization process, and a characteristic morphology of precipitates was observed in highly strained regions.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
A. Cervellon, S. Hemery, P. Kuernsteiner, B. Gault, P. Kontis, J. Cormier
Article
Nanoscience & Nanotechnology
Satoshi Utada, Jeremy Rame, Sarah Hamadi, Joel Delautre, Patrick Villechaise, Jonathan Cormier
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Editorial Material
Materials Science, Multidisciplinary
Tresa M. Pollock, Antoine Allanore, Amy J. Clarke, Jonathan Cormier, Matthias Militzer, Jian-Feng Nie, Sridhar Seetharaman, Il Sohn
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Engineering, Mechanical
Alice Cervellon, Luciana Maria Bortoluci Ormastroni, Zeline Hervier, Tresa M. Pollock, Fernando Pedraza, Jonathan Cormier
Summary: The study showed that a recrystallized layer thicker than the size of larger casting pores drastically reduces the fatigue life of the Ni-based single-crystal superalloy CMSX-4 at 1000 degrees C. Additionally, the recrystallized layer and roughness introduced by grit-blasting degrade the environmental resistance of the alloy and its resultant fatigue life. Moreover, the fatigue life of the coated specimens is greatly reduced by damage accumulation in the interdiffusion zone caused by grain boundary cracking, oxidation, and internal nitridation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Sean P. Murray, Alice Cervellon, Jonathan Cormier, Tresa M. Pollock
Summary: Research shows that fatigue crack initiation is mainly influenced by oxidation-assisted surface cracking in air, while the fatigue performance improves under vacuum due to the presence of internal casting pores. Additionally, recrystallized regions on the fracture surfaces of both alloys in the vacuum test condition have been identified, which was not previously reported for single crystal Ni-base alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lucille Despres, Sophie Costil, Jonathan Cormier, Patrick Villechaise, Romain Cariou
Summary: Surface laser texturing is used to enhance mechanical anchoring and adhesion between interfaces of thermal barrier coating systems. This study analyzed microstructural evolutions in different Ni-based single crystal superalloys during infrared nanosecond laser ablation, and compared thermal-affected volumes for different alloys. The research found that all studied single crystal superalloys behaved similarly during nanosecond laser ablation, suggesting possible non-uniform ablation kinetics between different phases of Ni-based alloys.
Article
Materials Science, Multidisciplinary
Satoshi Utada, Lucille Despres, Jonathan Cormier
Summary: The study found that the creep strength of nickel-based single crystal superalloys at high temperatures is mainly controlled by the remaining γ' volume fraction, with other factors playing a lesser role. The creep exponent for most alloys studied falls within the range of 6-9, indicating that dislocation glide and climb are the rate limiting deformation mechanisms. Damage mechanisms in extreme conditions include necking and recrystallization.
Article
Materials Science, Multidisciplinary
Wenrui An, Satoshi Utada, Xiaotong Guo, Stoichko Antonov, Weiwei Zheng, Jonathan Cormier, Qiang Feng
Summary: This study investigates the effects of overheating and thermal cycling on the creep properties and microstructural evolution of a directionally solidified superalloy. The results show that thermal cycling significantly reduces the creep life and leads to severe microstructural degradation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
E. Barraud, T. de Resseguier, J. Baillargeat, S. Hemery, J. Cormier
Summary: In this study, the dynamic behavior of a nickel-based superalloy under shock loading was investigated using laser-launched flyers. It was found that different microstructures and heat treatment conditions significantly influence the dynamic failure mechanisms.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Jean Charles Stinville, Lorena Mataveli Suave, Florent Mauget, Lionel Marcin, Patrick Villechaise, Tresa M. Pollock, Jonathan Cormier
Summary: The low and high temperature transverse creep behavior of a directionally solidified Ni-based superalloy DS200 is investigated in this study. In-situ creep tests with strain measurements are conducted to capture the creep strain evolution in individual crystallographic grains. The microstructure configurations promoting damage nucleation are also identified as a function of the loading condition, with high angle grain boundaries being the preferred sites for crack nucleation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Wenrui An, Satoshi Utada, Stoichko Antonov, Song Lu, Silang He, Fan Lu, Weiwei Zheng, Longfei Li, Jonathan Cormier, Qiang Feng
Summary: Thermal cycling creep tests were conducted on the directionally solidified superalloy DZ125 to simulate overheating conditions. The microstructural evolution and creep mechanism at different stages were characterized. Results showed three creep stages and the harmful effects of decreased gamma' volume fraction and deteriorated grain boundary. The coupled effect of overheating and thermal cycling damage accelerated creep deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
M. Huguet, G. Boissonnet, G. Lotte, J. Cormier, P. Villechaise, G. Bonnet, F. Pedraza
Summary: This paper investigates the initial oxidation stages of additive manufactured Rene 65 Ni-based superalloy between 700 and 900 degrees C in air and argon for 48 h, with different building directions and heat treatments. The only factor that impacts the oxidation behavior is the oxidizing atmosphere. The resulting oxide scales are composed of NiCr2O4 and Cr2O3 at 700 degrees C, while at 800 and 900 degrees C, an external Cr2O3 layer forms on top of an internal layer of alpha-Al2O3 due to lower oxygen partial pressure underneath the chromia layer.
Article
Engineering, Mechanical
Cesar-Moises Sanchez-Camargo, Yves Nadot, Jonathan Cormier, Fabien Lefebvre, Wen Hao Kan, Louis Ngai Sum Chiu, Chen Li, Aijun Huang
Summary: A study was conducted on Laser Powder Bed Fusion Inconel 718 to investigate the influence of defects and microstructure on high-cycle fatigue life. It was found that printing orientation had minimal effect on fatigue life, with most failures attributed to lack of fusion defects. The influence of defects was greater at 20 degrees C compared with 650 degrees C. Hot isostatic pressure treatment improved fatigue resistance. Natural cracks propagated in a similar manner to long cracks.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Yawei Li, Dong Wang, Yufeng He, Luciana Maria Bortoluci Ormastroni, Li Wang, Jonathan Cormier, Jian Zhang
Summary: The VHCF behavior of a Ni-based single crystal superalloy treated by different processes was studied. HRS and LMC samples showed cracks initiating from casting pores surrounded by a rough zone. The rotation of γ' within the rough zone was related to the operation of {1 1 1}(110) and {111}(11 2) slip systems. HRS+HIP specimens exhibited the best VHCF property with failure mainly occurring on the surface, while LMC process increased VHCF durability similar to HIP treatment, especially under low loading conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
J. Cormier, P. Gadaud, M. Czaplicki, R. Y. Zhang, H. B. Dong, T. M. Smith, F. Zhang, J. S. Tiley, S. L. Semiatin
Summary: Two in-situ test techniques were used to study the isothermal precipitation kinetics in superalloy 718. The observations suggested sequential periods of rapid volume fraction increase followed by a gradually-decreasing rate of change. Avrami exponents decreased with increasing temperature, and numerical simulations highlighted the competition between nucleation and growth in determining transformation kinetics.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)