Article
Nanoscience & Nanotechnology
Xiaolu Gui, Guhui Gao, Baifeng An, R. D. K. Misra, Bingzhe Bai
Summary: The study investigated the effects of inclusion size and microstructural features on HCF/VHCF in a B/M steel. It was found that fatigue crack initiation was mainly influenced by inclusions, with the majority of fatigue life consumed by the crack initiation process regardless of the source of the crack. The ratio of fatigue crack initiation life to total fatigue life exhibited a wide scatter due to variations in the B/M hierarchical structure within individual prior austenite grains when cracks initiated from sub-surface microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Stanislava Fintova, Libor Trsko, Zdenek Chlup, Filip Pastorek, Daniel Kajanek, Ludvik Kunz
Summary: Fatigue tests on the AZ91 cast alloy revealed different fatigue crack initiation mechanisms in different fatigue regions, with slip markings and particle cracking being the primary mechanisms. The importance of particle cracking increased as stress amplitude decreased, leading to the continued growth of fatigue cracks. The change in fatigue crack initiation mechanisms caused the S-N curve to shift towards a higher number of cycles to fracture.
Article
Engineering, Mechanical
Xue Li, Yajun Dai, Xiangyu Wang, Yongjie Liu, Yao Chen, Chong Wang, Hong Zhang, Lang Li, Hanqing Liu, Chao He, Qingyuan Wang
Summary: This study investigates the effect of local microstructure on the crack initiation behavior of a super martensitic stainless steel in the very high cycle fatigue regime. Results show that non-inclusion-induced crack initiation dominates, with fatigue cracks initiating from martensite boundaries forming slip areas. The size and orientation of martensite lath affect the morphology of slip areas but have limited influence on the formation of fine granular areas at the fracture surface.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jun Guo, Aimin Zhao, Maosheng Yang
Summary: The fatigue properties of M50 bearing steel under high cycle fatigue at room temperature were investigated. The fatigue cracks in M50 bearing steel primarily originated from MgO-Al2O3 inclusions and MC/M2C primary carbides. The voids were initiated by debonding of inclusions from the matrix and cracking of primary carbides under cyclic loading. Small cracks initiated perpendicular to the tensile stress and propagated at a speed of 8.81 x 10-10 m/cycle in the fine granular area (FGA). A fatigue crack nucleation model and fatigue life model were established based on stress intensity factor range, defect properties, and number of cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Xue Li, Chao He, Xiangyu Wang, Yao Chen, Chong Wang, Hong Zhang, Lang Li, Yongjie Liu, Qingyuan Wang
Summary: This study investigated the behavior and crack initiation mechanism of super martensitic stainless steel under very-high-cycle fatigue at elevated temperature. The cracks in this condition initiated from the surface and formed a fine granular area. This area consisted of an initiation site, a smooth region, and an annular continuous fine granular area. The fine granular area formed in the peaks and valleys of local microstructures, while the smooth regions connected these peaks and valleys dominated by shear stress.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Alice Cervellon, Chris J. Torbet, Tresa M. Pollock
Summary: The anisotropic fatigue properties of three Ni-based SX superalloys were investigated in the very high cycle fatigue regime. The [111] orientation showed higher fatigue lives at high stresses but lower fatigue lives at very low stresses. The resolved shear stress on the octahedral slip systems and the pseudo-cube slip in the matrix were identified as the main reasons for the anisotropy effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Yajun Dai, Shijian Wang, Qiyuan He, Chang Liu, Xianyu Wang, Xue Li, Lang Li, Yongjie Liu, Chao He, Qingyuan Wang
Summary: The multi-scaled microstructure of martensitic steel significantly affects the initiation and early propagation of cracks. Micro cracks first occur in the slip bands inside the single crystal laths, then coalesce through the lath boundaries, and finally propagate slowly in neighboring grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Jinbiao Zhou, Richard A. Barrett, Sean B. Leen
Summary: A physically-based methodology for predicting high temperature fatigue crack initiation in 9Cr steels is presented, considering material inhomogeneity induced by welding. The modified Tanaka-Mura model is implemented to simulate cyclic softening in 9Cr steels, and validated using finite element modeling. The study highlights the importance of adopting an energy-based approach to account for cyclic softening and its impact on the service life of welded connections.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Zhiwei Wu, Maosheng Yang, Kunyu Zhao
Summary: The new generation of bearing steel exhibits good comprehensive properties. Research on fatigue properties of 15Cr14Co12Mo5Ni2 bearing steel after carburization and heat treatment shows that its fatigue strength at room temperature and 500 degrees C is 1027 MPa and 585 MPa, respectively.
Article
Materials Science, Multidisciplinary
Zhi Qin, Bin Li, Chen Chen, Tianyue Chen, Rui Chen, Han Zhang, Hongqian Xue, Changfeng Yao, Liang Tan
Summary: The study investigated the high cycle and very high cycle fatigue behavior of the GH4169 superalloy. The results showed that failures in different fatigue regimes had different initiations, and significant strain localization occurred at the twin boundaries of the material under fatigue cyclic loading.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Weiqian Chi, Gen Li, Wenjing Wang, Chengqi Sun
Summary: This study investigates the very high cycle fatigue behavior of additively manufactured Ti-6Al-4V material under different stress ratios. The fracture surface analysis reveals the presence of a fine granular area (FGA) with discontinuous regions of nanograins in the crack initiation and early growth region. The crack growth rate in the FGA can be used to predict the fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Jingyu Sun, Guian Qian, Jianghua Li, Ruiyang Li, Zhimo Jian, Youshi Hong, Filippo Berto
Summary: Currently, there is no systematic approach to simulate the microstructure sensitive crack initiation and propagation process in very-high-cycle fatigue. In this study, a computational framework combining crystal plasticity and cohesive zone model is developed to simulate the defect-induced short crack growth in an additively manufactured AlSi10Mg alloy. The framework can control the crack growth rate and the proportion of crack initiation damage in the total damage. An acceleration strategy is proposed to improve the computational efficiency for very-high-cycle fatigue. Experimental observations and simulation results show good agreement.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Tsuyoshi Miyakoshi, Takeru Atsumi, Kensuke Kosugi, Atsushi Hosoi, Terumasa Tsuda, Hiroyuki Kawada
Summary: This paper investigates the transverse crack initiation behaviors of carbon fiber-reinforced plastics (CFRPs) in the high-cycle and very high cycle regimes. The fatigue behavior of cross-ply CFRP laminates formed with T800S/2592 prepreg was studied by using an ultrasonic fatigue testing system. The results show that the slope of the S-N diagram for transverse crack initiation decreases linearly within a certain number of cycles and levels off after a certain number of cycles, and no cracks were observed under a certain stress.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Guoying Sui, Zhenqiang Wang, Jiarui Li, Chengzhi Zhao, Fengchun Jiang, Hongliang Li
Summary: In this study, the fatigue characteristics and cracking behaviors of 42CrMo steel with two different microstructures (fine/coarse-grain tempered sorbite/bainite) were investigated. It was found that fine-grain microstructure exhibits higher fatigue strength, while the coarse-grain microstructure has a higher fatigue crack growth threshold. The presence of multiple fatigue sources and higher-degree ratchetting-fatigue damage in the coarse-grain microstructure accelerates fatigue crack initiation. Roughness-induced crack closure in the coarse-grain microstructure leads to a delay in fatigue crack growth and an increase in the fatigue crack growth threshold.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Tao Gao, Hongqian Xue, Zhidan Sun, Delphine Retraint, Yanli He
Summary: The fatigue behavior and damage mechanisms of a Ti-8Al-1Mo-1V alloy were investigated in the very high cycle fatigue (VHCF) regime. It was found that the crack initiation area is characterized by nano-marking facets and flat facets induced by slip activity. The large scatter in fatigue life can be attributed to slip inhomogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Rosalia Rementeria, Lucia Morales-Rivas, Matthias Kuntz, Carlos Garcia-Mateo, Eberhard Kerscher, Thomas Sourmail, Francisca G. Caballero
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2015)
Article
Chemistry, Physical
Azmir Azhari, Christian Schindler, Claudia Godard, Jens Gibmeier, Eberhard Kerscher
APPLIED SURFACE SCIENCE
(2016)
Article
Chemistry, Physical
Inga Mueller, Rosalia Rementeria, Francisca G. Caballero, Matthias Kuntz, Thomas Sourmail, Eberhard Kerscher
Article
Engineering, Mechanical
D. Spriestersbach, P. Grad, E. Kerscher
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2017)
Editorial Material
Engineering, Mechanical
Stefanie E. Stanzl-Tschegg, Eberhard Kerscher
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2017)
Article
Engineering, Mechanical
P. Grad, E. Kerscher
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2017)
Article
Engineering, Mechanical
D. Grell, F. Dabrock, E. Kerscher
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2018)
Article
Metallurgy & Metallurgical Engineering
Christoph Ruffing, Patrick Grad, Markus Klassen, Ralf Mueller, Eberhard Kerscher
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2013)
Article
Materials Science, Multidisciplinary
Luisa Boehme, Lucia Morales-Rivas, Stella Diederichs, Eberhard Kerscher
MATERIALS CHARACTERIZATION
(2018)
Review
Chemistry, Multidisciplinary
Jan Patrick Sippel, Eberhard Kerscher
APPLIED SCIENCES-BASEL
(2020)
Article
Materials Science, Multidisciplinary
Amin Khayatzadeh, Jan Sippel, Stefan Guth, Karl-Heinz Lang, Eberhard Kerscher
Summary: Thermo-mechanical treatment (TMT) at the temperature of maximum dynamic strain aging has been optimized and performed on SAE4140H steel to improve its fatigue limit in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes. The results of fatigue tests with ultimate cycle numbers of 10^7 and 10^9 showed that TMT can increase both the fatigue lifetime and the fatigue limit in the HCF and VHCF regimes. The increased stress intensity factors of critical inclusions after TMT suggest that the improved effect can be attributed to the stabilized microstructure around critical crack-initiating inclusions through the locking of edge dislocations by carbon atoms during TMT.
Article
Engineering, Manufacturing
Martin Bohley, Ingo G. Reichenbach, Sonja Kieren-Ehses, Lukas Heberger, Peter A. Arrabiyeh, Rolf Merz, Luisa Boehme, Julian Hering, Benjamin Kirsch, Michael Kopnarski, Eberhard Kerscher, Georg von Freymann, Jan C. Aurich
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2018)
Proceedings Paper
Engineering, Mechanical
Christoph Ruffing, Eberhard Kerscher
11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2
(2014)
Proceedings Paper
Engineering, Mechanical
Patrick Grad, Daniel Spriestersbach, Eberhard Kerscher
11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2
(2014)
Proceedings Paper
Engineering, Mechanical
Claudia Kuehn, Eberhard Kerscher
LIGHT METALS TECHNOLOGY 2013
(2013)
Article
Nanoscience & Nanotechnology
Jie Zhang, Xiaoyang Chen, MingJian Ding, Jiaqiang Chen, Ping Yu
Summary: This study enhances the compositional inhomogeneity of relaxor ferroelectric thin films to improve their dielectric temperature stability. The prepared films exhibit a relatively high dielectric constant and a very low variation ratio of dielectric constant over a wide temperature range.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaoyu Chen, Ranran Zhang, Hao Zou, Ling Li, Qiancheng Zhu, Wenming Zhang
Summary: Polyaniline-manganese dioxide composites exhibit high conductivity, long discharge platform, and stable circulation, and the specific capacity is increased by providing additional H+ ions to participate in the reaction.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xutao Huang, Yinping Chen, Jianjun Wang, Gang Lu, Wenxin Wang, Zan Yao, Sixin Zhao, Yujie Liu, Qian Li
Summary: This study aims to establish a novel approach to better understand and predict the behavior of materials with multi-scale lamellar microstructures. High-resolution reconstruction and collaborative characterization methods are used to accurately represent the microstructure. The mechanical properties of pearlite are investigated using crystal plasticity simulation and in-situ scanning electron microscopy tensile testing. The results validate the reliability of the novel strategy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Cheng Chen, Fanchao Meng, Jun Song
Summary: This study systematically investigated the unfaulting mechanism of single-layer interstitial dislocation loops in irradiated L12-Ni3Al. The unfaulting routes of the loops were uncovered and the symmetry breaking during the unfaulting processes was further elucidated. A continuum model was formulated to analyze the energetics of the loops and predict the unfaulting threshold.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Darshan Bamney, Laurent Capolungo
Summary: This work investigates the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals, focusing on the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to study the energetic feasibility of CN of ATPs resulting from GB dislocation dissociation. The model reveals that CN is preferred over the nucleation of a single twin variant for low misorientation angle GBs. Further analysis considering GB character and twin system alignment suggests that CN events could be responsible for ATP formation even at low m' values.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Bing Han, Zhengqian Fu, Guoxiang Zhao, Xuefeng Chen, Genshui Wang, Fangfang Xu
Summary: This study investigates the behavior of electric-field induced antiferroelectric to ferroelectric (AFE-FE) phase transition and reveals the evolution of atomic displacement ordering as the cause for the transition behavior changing from sharp to diffuse. The novel semi-ordered configuration results from the competing interaction between long-range displacement modulation and compositional inhomogeneity, which leads to a diffuse AFE-FE transition while maintaining the switching field.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Akib Jabed, Golden Kumar
Summary: This study demonstrates that cryogenic rejuvenation promotes homogeneous-like flow and increases ductility in metallic glass samples. Conversely, annealing has the opposite effect, resulting in a smoother fracture surface.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xin Ji, Yan Chong, Satoshi Emura, Koichi Tsuchiya
Summary: A heterogeneous microstructure in Ti-15Mo-3Al alloy with heterogeneous distributions of Mo element and omega(iso) precipitates has achieved a four-fold increase in tensile ductility without a loss of tensile strength, by blocking the propagation of dislocation channels and preventing the formation of micro-cracks.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Amit Samanta, Prasanna Balaprakash, Sylvie Aubry, Brian K. Lin
Summary: This study proposes a combined large-scale first principles approach with machine learning and materials informatics to quickly explore the chemistry-composition space of advanced high strength steels (AHSS). The distribution of aluminum and manganese atoms in iron is systematically explored using first principles calculations to investigate low stacking fault energy configurations. The use of an automated machine learning tool, DeepHyper, speeds up the computational process. The study provides insights into the distribution of aluminum and manganese atoms in systems containing stacking faults and their effects on the equilibrium distribution.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Guowei Zhou, Yuanzhe Hu, Zizheng Cao, Myoung Gyu Lee, Dayong Li
Summary: In this work, a physics-constrained neural network is used to predict grain-level responses in FCC material by incorporating crystal plasticity theory. The key feature, shear strain rate of slip system, is identified based on crystal plasticity and incorporated into the loss function as physical constitutive equations. The introduction of physics constraints accelerates the convergence of the neural network model and improves prediction accuracy, especially for small-scale datasets. Transfer learning is performed to capture complex in-plane deformation of crystals with any initial orientations, including cyclic loading and arbitrary non-monotonic loading.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Pengfei Yang, Qichang Li, Zhongying Wang, Yuxiao Gao, Wei Jin, Weiping Xiao, Lei Wang, Fusheng Liu, Zexing Wu
Summary: In this study, the HER performance of Ru-based catalysts is significantly improved through the dual-doping strategy. The obtained catalyst exhibits excellent performance in alkaline freshwater and alkaline seawater, and can be stably operated in a self-assembled overall water splitting electrolyzer.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Zening Yang, Weiwei Sun, Zhengyu Sun, Mutian Zhang, Jin Yu, Yubin Wen
Summary: Multicomponent oxides (MCOs) have wide applications and accurately predicting their thermal expansion remains challenging. This study introduces an innovative attention-based deep learning model, which achieves improved performance by using two self-attention modules and demonstrates adaptability and interpretability.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ze Liu, Cai Chen, Yuanxun Zhou, Lanting Zhang, Hong Wang
Summary: This study attempts to address the gap in cooling rates between thin film deposition and bulk metallic glass (BMG) casting by correlating the glass-forming range (GFR) determined from combinatorial materials chips (CMCs) with the glass-forming ability (GFA) of BMG. The results show that the full-width at half maximum (FWHM) of the first sharp diffraction peak (FSDP) is a good indicator of BMG GFA, and strong positive correlations between FWHM and the critical casting diameter (Dmax) are observed in various BMG systems. Furthermore, the Pearson correlation coefficients suggest possible similarities in the GFA natures of certain BMG pairs.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Mike Schneider, Jean-Philippe Couzinie, Amin Shalabi, Farhad Ibrahimkhel, Alberto Ferrari, Fritz Koermann, Guillaume Laplanche
Summary: This work aims to predict the microstructure of recrystallized medium and high-entropy alloys, particularly the density and thickness of annealing twins. Through experiments and simulations, a database is provided for twin boundary engineering in alloy development. The results also support existing theories and empirical relationships.
SCRIPTA MATERIALIA
(2024)
