Article
Materials Science, Multidisciplinary
Jinjun Xu, Zhongqi Hao, Zhenghong Fu, Xingdao He, Hui Wang, Guili Xu
Summary: Slow strain rate tensile tests under in situ hydrogen electrochemical charge were conducted to investigate the hydrogen embrittlement behavior of selective laser-melted (SLM) and post-heat-treated Inconel 718 alloys, along with microstructure evolution and cracking feature characterization. The study found that the high density of dislocations and local strain along the cellular structure walls in the as-SLM sample increased local hydrogen concentration, resulting in cracks along the cell walls. The precipitation of g0, g00, and 8 phases generated by solution aging significantly enhanced the tensile strength and HE susceptibility, with the 8 phase formation along the grain boundaries and cell walls leading to 8/g interface cracking in solution-aged samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Optics
Chuanyu Wang, Jianzhong Zhou, Teng Zhang, Xiankai Meng, Pengfei Li, Shu Huang
Summary: This paper establishes a three-dimensional numerical model to investigate the non-isothermal flow and solidification characteristics in laser cladding process. Through theoretical analysis and simulation, the variations of temperature and solidification rate on the solidification front are revealed, and the reliability of the model is verified by comparing with experimental measurements.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yan-Xing Liu, Zhi-Jiang Ke, Run-Hua Li
Summary: Hot compressive deformation tests were conducted on Inconel 718 to study the evolution of microstructure and flow stress under constant and varying strain rate conditions. It was observed that after sudden changes in strain rate, both microstructure and flow stress exhibited transient periods. The fraction of recrystallization and flow stress gradually evolved towards values obtained under the corresponding constant strain rate. The durations of the transient periods were found to be different for recrystallization, flow stress, and local misorientation, with local misorientation being a more comprehensive indicator of the transient microstructure state.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Can Erdogan, Hande Vural, Aptullah Karakas, Tevfik Ozan Fenercioglu, Tuncay Yalcinkaya
Summary: This study analyzes and predicts the ductile failure of nickel-based super alloy Inconel 718 in the flow forming process through finite element analysis. It is found that the Cockcroft-Latham model can accurately predict the formability limits and crack initiation locations, while the Mohr-Coulomb and Johnson-Cook models overestimate the damage. Moreover, the effects of temperature and process parameters on the flow forming process are further examined.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Multidisciplinary
Zhixun Wen, Changsheng Ai, Jundong Wang, Yating Liu, Zhufeng Yue, Xing Ai
Summary: This study developed an innovative fiber optic sensor based on EFPI for measuring the tensile strain of Inconel 718 specimens, with sensitivity and measurement range of 26.59 nm/με and 166,000 με respectively. The accuracy of the proposed sensor was verified through comparison with electronic extensometer measurements.
Article
Materials Science, Multidisciplinary
Sumit K. Sharma, K. Biswas, J. Dutta Majumdar
Summary: This study aims to investigate the microstructure, residual stress, and microhardness of electron beam surface remelted Inconel 718 alloy. The study found that surface remelting leads to significant microstructural refinement and improvement in hardness, and optimizing process parameters can further enhance performance.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Automation & Control Systems
Jing Ni, Kangcheng Tong, Zhen Meng, Kai Feng
Summary: A new numerical model for predicting and controlling the broaching force with complex profile tools was proposed in this study, which considered the curve function of the boundary and was validated through experiments. The modified model showed improved accuracy compared to the traditional model, and demonstrated significant impact on the broaching process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
David A. McClintock, Maxim N. Gussev, Cody Campbell, Keyou Mao, Timothy G. Lach, Wei Lu, Jordan A. Hachtel, Kinga A. Unocic
Summary: An increase in ductility was observed with increasing radiation dose during postirradiation evaluation of Inconel 718 proton beam window. The material retained high tensile strength and exhibited appreciable ductility after irradiation. The existence of radiation-induced defect structures, such as stacking faults and vacancy clusters, may have contributed to the material's ability to strain-harden during deformation and increase the ductility.
Article
Materials Science, Multidisciplinary
Jong-Soo Park, Seung-Woo Kim, Hyung-Cheol Lim, Jong-Hun Kang
Summary: In this study, a constitutive equation (CE) was formulated to describe the deformation behavior of Inconel 718, and the optimization process combining Joule heating analysis was validated for determining the CE's parameters for high-temperature applications.
Article
Chemistry, Physical
Huachen Peng, Wencheng Tang, Yan Xing, Xin Zhou
Summary: This study presented an accurate predictive equation for surface residual stress of Inconel 718 materials by analyzing experimental and simulation data, and considering cutting parameters. The results indicated a high degree of accuracy in predicting surface residual stress, with a correlation coefficient of 0.9624 and an absolute average error of 13.40%. The proposed equation was proven to be effective within the studied cutting parameters and experimental errors.
Article
Materials Science, Multidisciplinary
Yan Chen, Iuliana Cernatescu, Vasisht Venkatesh, Alexandru D. Stoica, Ke An
Summary: Residual stresses in nickel-based superalloy engineering structure can cause distortion or reduction of performance reliability during high temperature service. In situ time-of-flight neutron diffraction is used to study the real-time relaxation of residual stress in Inconel 718 blocks with different initial states. The majority of residual stress is relieved after 14 to 20 hours at 718°C, and multi-stage relaxation kinetics are observed. Despite the initial discrepancies in samples due to different thermal treatments, the final residual stresses tend to have small variations after relaxation.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Yancheng Li, Mo Li, Qing Wang, Yajun Zhao, Shuang Zhang, Cunlei Zou, Ying Li, Lianchao Wang, Chuang Dong
Summary: Superalloys with complex compositions make it difficult to select the proper composition. This paper aims to understand and update the composition standard using the example of the common grade Inconel 718. The study reveals that the alloy chemistry can be expressed using cluster formulas and supercluster formulas, and identifies a specific composition zone.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Guoying Li, Zhanqiang Liu, Bing Wang
Summary: This study found that the infiltration of tellurium element through a new alloy infiltration method can lead to reduced surface material properties of nickel-based super-alloy Inconel 718, mainly due to the formation of a new intercrystalline phase and delamination phenomenon. Additionally, the stress reduction in the tellurium infiltration zone exceeded 50%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Manufacturing
Zhichao Yang, Lida Zhu, Shuhao Wang, Jinsheng Ning, Yichao Dun, Guiru Meng, Pengsheng Xue, Peihua Xu, Bo Xin
Summary: This study establishes a kinematic model of powder flow and explores the effect of ultrasound on molten pool-spatter-powder flow in the cladding process, revealing that the evolution of cavitation bubbles affects the flow in the molten pool and causes lamination in the cladding layer. Results show that a new forming strategy can effectively reduce defects caused by lamination and improve the microstructure and microhardness of formed workpieces.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Ateekh Ur Rehman, Yusuf Usmani, Ali M. Al-Samhan, Saqib Anwar
Summary: Nickel-based superalloys demonstrate excellent high temperature performance, showing high tensile strength and good tensile ductility in room temperature tests. Joining two different nickel-based superalloys using rotary friction welding produced defect-free metallurgical joints.
Article
Materials Science, Multidisciplinary
P. A. T. Olsson, J. Blomqvist, C. Bjerken, A. R. Massih
COMPUTATIONAL MATERIALS SCIENCE
(2015)
Article
Instruments & Instrumentation
Tuerdi Maimaitiyili, Jakob Blomqvist, Axel Steuwer, Christina Bjerken, Olivier Zanellato, Matthew S. Blackmur, Jerome Andrieux, Fabienne Ribeiro
JOURNAL OF SYNCHROTRON RADIATION
(2015)
Article
Crystallography
T. Maimaitiyili, A. Steuwer, J. Blomqvist, C. Bjerken, M. S. Blackmur, O. Zanellato, J. Andrieux, F. Ribeiro
CRYSTAL RESEARCH AND TECHNOLOGY
(2016)
Article
Chemistry, Physical
Zhiyang Wang, Axel Steuwer, Nanxi Liu, Tuerdi Maimaitiyili, Maxim Avdeev, Jakob Blomqvist, Christina Bjerken, Caroline Curfs, Justin A. Kimpton, John E. Daniels
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Chemistry, Physical
T. Maimaitiyili, C. Bjerken, A. Steuwer, Z. Wang, J. Daniels, J. Andrieux, J. Blomqvist, O. Zanellato
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Materials Science, Multidisciplinary
P. A. T. Olsson, A. R. Massih, J. Blomqvist, A. -M. Alvarez Holston, C. Bjerken
COMPUTATIONAL MATERIALS SCIENCE
(2014)
Article
Engineering, Mechanical
U. Hejman, C. Bjerken
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2011)
Article
Materials Science, Multidisciplinary
C. Bjerken, M. Ortiz
INTERNATIONAL JOURNAL OF FRACTURE
(2010)
Article
Materials Science, Multidisciplinary
C. Bjerken, A. R. Massih
PHILOSOPHICAL MAGAZINE
(2014)
Article
Chemistry, Physical
Tuerdi Maimaitiyili, Robin Woracek, Magnus Neikter, Mirko Boin, Robert C. Wimpory, Robert Pederson, Markus Strobl, Michael Drakopoulos, Norbert Schaefer, Christina Bjerken
Article
Engineering, Civil
Claudio F. Nigro, Christina Bjerken, Ylva Mellbin
INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
C. F. Nigro, C. Bjerken, Y. Mellbin
Summary: This paper presents a model to predict stress-induced precipitation along phase interfaces in metals, using a phase-field approach to describe microstructural evolution. The model combines system expansion due to phase transformation, stress field, and phase boundary energy as the driving force for precipitate growth. The study demonstrates the effectiveness of capturing crack-induced precipitation at phase interfaces with numerical efficiency, solving only one equation.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Materials Science, Multidisciplinary
Andreas M. Krause, Par A. T. Olsson, Denis Music, Christina Bjerken
Summary: To understand the impact of carbide precipitates on martensitic steels' hydrogen embrittlement, we used density functional theory to investigate the solution energies and energy barriers for hydrogen diffusion in orthorhombic M7C3 (M = Cr, Mn, Fe). Our findings reveal that hydrogen diffuses easily into the lattice, leading to internal stresses or weakened bonds, ultimately reducing ductility. The lowest hydrogen solution energies were found to be-0.28, 0.00, and 0.03 eV/H-atom for Cr7C3, Mn7C3, and Fe7C3, respectively. The nudged elastic band method showed relatively low energy barriers for hydrogen diffusion via interstitial octahedral sites. Analysis of atomic volumes showed a correlation between low solution energies and energy barriers and atoms with large atomic volumes, with the presence of carbon increasing the energy barrier. These results explain previous experimental observations of hydrogen in the bulk of Cr7C3 precipitates and provide a solid foundation for future steel design with high strength and commensurable ductility.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Niklas Ehrlin, Christina Bjerken, Martin Fisk
AIMS MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)