Article
Engineering, Mechanical
N. Dudova, R. Mishnev, R. Kaibyshev
Summary: The correlation between cyclic softening and microstructural evolution was studied in a 10%Cr steel tested at 650°C using interrupted low cycle fatigue (LCF) tests with a low strain amplitude of ±0.2%. It was found that cyclic softening was mainly attributed to a decrease in friction stress due to dislocation annihilation, while back stress remained more stable due to additional precipitation on the lath boundaries despite intense lath widening caused by the disappearance of lath boundaries.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Yanyun Zhao, Haibo Cao, Shaojun Liu
Summary: The fatigue behavior of RAFM steel is strongly influenced by shear stress conditions and varies under different loading paths. Fatigue softening is observed under proportional multi-axial loading, while additional hardening is observed under non-proportional multi-axial cyclic loading related to dislocation activities.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Engineering, Mechanical
M. Chinara, B. Jayabalan, B. Bhattacharya, A. Durga Prasad, S. Chatterjee, S. Mukherjee
Summary: The low-cycle fatigue behavior of a newly developed ferrite-bainite 780 steel with nanosized precipitates was investigated. Cyclic stress response and strain life were determined through fully reversed strain-controlled LCF tests. The steel exhibited cyclic softening behavior at lower strain amplitudes, but cyclic hardening at higher strain amplitudes. Microstructural analysis revealed grain fragmentation and texture weakening during cyclic deformation, and TEM study showed the evolution of dislocation structure responsible for cyclic softening/hardening behavior. The role of nano-precipitates in influencing the fatigue behavior was also investigated.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Z. R. Zhang, Z. M. Yue, Y. M. Bao, C. W. Xu, J. Gao
Summary: Research on the fatigue behaviors of dual-phase steels (DP600) under cyclic shear path has shown that the material exhibits cyclic softening, with smaller loading amplitudes and higher strain ratios improving the softening ability. Additionally, well-developed gamma-fiber-type texture components at higher strain ratios enhance the fluidity of the dual-phase steel, leading to more uniform microstructure deformation and reduced risk of damage caused by deformation compatibility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Lianyong Xu, Fangdong Bao, Lei Zhao, Yongdian Han, Hongyang Jing, Huajin Yu, Xueting Gong
Summary: This study investigated the relationship between microstructural evolution and low cycle fatigue behavior of 316H austenitic steel at the working temperature of generation-IV nuclear power plants. It was found that different strain amplitudes led to different expressions of cyclic softening behavior due to the evolution of dislocation structures, and dynamic recrystallization resulted in a decrease in dislocation density. A modified life prediction model based on plastic strain energy was proposed to predict the fatigue life of 316H steel.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Shuo Weng, Yuhui Huang, Mingliang Zhu, Fuzhen Xuan
Summary: This study investigated the microstructural evolution under low-cycle fatigue in base metal (BM) and weld metal (WM) of NiCrMoV steel welded joints through miniature tensile tests and microstructural observations. Results showed that the yield strength and ultimate tensile strength of both BM and WM decreased after low-cycle fatigue tests, attributed to reduction of dislocation density and formation of low-energy structures. However, the microstructural evolution mechanisms in BM and WM under the same cyclic loadings were different.
Article
Engineering, Mechanical
Puja Ghosal, Abhishek Raj, Surajit Kumar Paul
Summary: The study investigates the low cycle fatigue behavior of dual-phase steel (DP590) under different pre-straining paths. It was found that all specimens exhibited continuous cyclic softening, with the equi-biaxial pre-strain specimen showing a higher rate of cyclic softening. The rotation of one maximum shear stress plane during fatigue cycling after equi-biaxial pre-straining introduces non-proportional loading, leading to a significant reduction in fatigue life. The larger lattice rotation and in-grain misorientation due to the non-proportional loading is particularly notable for the equi-biaxial pre-strain specimen.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Zhihong Wu, Hongchao Kou, Jinshan Li, Samuel Hemery, Nana Chen, Junhui Tang, Fengming Qiang, Fan Sun, Frederic Prima
Summary: Dwell fatigue failure of titanium alloy components has been a major threat to aircraft safety for the past 50 years. Designing a microstructure with low primary alpha phase content can achieve high strength and low sensitivity to dwell loading. Cracking occurs primarily along preexisting slip bands and twist grain boundaries. Load holding plays a significant role in crack initiation and switching of crack modes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Akinobu Shibata, Goro Miyamoto, Shigekazu Morito, Akiko Nakamura, Taku Moronaga, Houichi Kitano, Ivan Gutierrez-Urrutia, Toru Hara, Kaneaki Tsuzaki
Summary: In this study, the substructures and crystallographic features of as-quenched lath martensite in interstitial-free (IF) steel and low-carbon steel (0.2C steel) were analyzed using advanced microscopy techniques. The study revealed differences in the morphology and habit plane orientation between the two types of steel. Dislocation structures, cementite formation, and carbon segregations were observed, indicating significant changes in the substructure during quenching. Based on the experimental results, the researchers discussed the origin of the substructures and crystallographic features of lath martensite.
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
Engineering, Mechanical
Zhongran Zhang, Zhenming Yue, Jiashuo Qi, Jun Gao, Yliang Qiu
Summary: In this study, a sheet fatigue shear test device is designed and applied to low-cycle fatigue testing of DP900 with varying strain amplitudes. Microstructure analysis and fracture surface examination reveal cyclic softening behavior, with total plastic strain energy absorbed increasing as loading amplitude decreases. The life prediction model based on plastic strain energy density and strain amplitude is suitable for cyclic shear paths, with microinhomogeneity influencing stress and strain distribution, particularly martensite deformation.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Chemistry, Physical
Christos G. Prosgolitis, Alexis T. Kermanidis, Helen Kamoutsi, Gregory N. Haidemenopoulos
Summary: The plastic deformation during cold roll forming can affect the fatigue performance of lightweight steel profiles, resulting in decreased fatigue resistance and ductility, as well as cyclic softening. Plastic pre-straining also reduces the transition life and fracture section of the materials.
Article
Engineering, Mechanical
Bimal Das, Akhilendra Singh, Puja Ghosal, Ashish Priya, R. Rohith Kumar Reddy
Summary: The study investigates the impact of hydrogen charging on the transformation induced plasticity steel during strain-controlled low cycle fatigue (LCF). Hydrogen charging negatively affects the strain-controlled LCF lives. The uncharged specimen experiences cyclic hardening due to strain-induced martensitic transformation (SIMT), while the hydrogen charged specimen exhibits cyclic softening and suppresses cyclic hardening due to the large fraction of low angle grain boundaries. Additionally, the cyclic plasticity modeling using the Ohno-Wang kinematic hardening model accurately simulates the cyclic stress-strain hysteresis loop and cyclic softening curve of both uncharged and hydrogen charged specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Marco Pelegatti, Alex Lanzutti, Enrico Salvati, Jelena Srnec Novak, Francesco De Bona, Denis Benasciutti
Summary: This study focuses on the cyclic response and low-cycle fatigue performance of AISI 316L stainless steels at room temperature, providing design strain-life curves through experimental testing and parameter calibration. The statistical methodology presented appears to be an efficient tool for engineers dealing with durability problems, allowing the selection of fatigue strength curves at various failure probabilities depending on the sought safety level.
Article
Materials Science, Multidisciplinary
Yang Guang, Du Guojun
Summary: The microstructure of martensitic steel was analyzed using transmission electron microscopy and X-ray diffraction. Low-cycle fatigue (LCF) tests were conducted on martensitic steel with different strain amplitudes using an MTS universal hydraulic servo testing machine. The damage accumulation and cyclic elastic-plastic constitutive model of martensitic steel were studied, and the influence of tempering on hysteretic loop and fatigue damage was discussed. With the tempering temperature increasing, the area of the hysteresis loop increased, hysteresis energy increased, and fatigue life decreased.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
A. Fedoseeva, I Nikitin, N. Dudova, R. Kaibyshev
Article
Chemistry, Physical
Roman Mishnev, Nadezhda Dudova, Rustam Kaibyshev, Andrey Belyakov
Article
Nanoscience & Nanotechnology
A. Fedoseeva, I. Nikitin, N. Dudova, R. Kaibyshev
Summary: The precipitation of Z-phase in 9% Cr-3% Co martensitic steel during creep at 923 K and 948 K is influenced by temperature, with significant effects on nucleation mechanisms and coarsening behaviors. Different mechanisms of Z-phase precipitation have been observed, including in-situ transformation of MX carbonitrides and strain-induced metastable Z-phase nucleation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Alexandra Fedoseeva, Ivan Nikitin, Evgeniy Tkachev, Roman Mishnev, Nadezhda Dudova, Rustam Kaibyshev
Summary: The study on P92-type steels with different chemical compositions showed that an increase in B and Cr contents affects the precipitation of M23C6 carbides, while (W+Mo) content influences the diffusion growth and coarsening of Laves phase. The addition of Re to 10%Cr steel can reduce the coarsening rate of Laves phase.
Article
Materials Science, Multidisciplinary
A. Fedoseeva, I. Nikitin, N. Dudova, R. Kaibyshev
Summary: The study investigated the creep behavior of Re-containing 10% Cr-3% Co-3% W steel at 650 degrees C and its impact on the tempered martensite lath structure. Creep strain accelerated the depletion of W from the solid solution, while long-term aging resulted in stable lath widths. Creep strain facilitated structure recovery, leading to subgrain formation and particle coarsening.
MATERIALS AT HIGH TEMPERATURES
(2021)
Article
Nanoscience & Nanotechnology
A. Fedoseeva, I Nikitin, N. Dudova, R. Kaibyshev
Summary: The study investigated the coarsening of Laves phase in a 10% Cr-3% Co-3% W steel at 923 K, revealing that the strain during creep accelerates the depletion of tungsten from the ferrite matrix and the precipitation of Laves phase. The coarsening of Laves phase follows Ostwald ripening and is controlled by grain boundary diffusion, with growth observed on different boundaries and a significant contribution to creep behavior from dense chains of Laves phase on lath boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Alexandra Fedoseeva, Ivan Nikitin, Nadezhda Dudova, John Hald, Rustam Kaibyshev
Summary: This paper presents the experimental results of thermo-mechanical processing on a 12% Cr steel, which resulted in increased impact toughness and decreased ductile-brittle transition temperature. The study also observed changes in the interfaces and carbides between different phases.
Editorial Material
Materials Science, Multidisciplinary
Nadezhda Dudova
Article
Materials Science, Multidisciplinary
Anna Bodyakova, Roman Mishnev, Andrey Belyakov, Rustam Kaibyshev
Summary: This study investigates the phase content and strengthening mechanism of two copper alloys, 0.1Cr-0.1Zr and 0.9Cr-0.1Zr, and finds that the size of second phase particles and the strengthening mechanism are closely related to the chromium content.
JOURNAL OF MATERIALS SCIENCE
(2022)
Review
Materials Science, Multidisciplinary
Nadezhda Dudova
Summary: This paper provides an overview of the creep strength and microstructural features of 9% Cr and 10-12% Cr martensitic steels with high B and low N contents, achieved through modifying the chemical composition. The optimal B/N ratio in steels is discussed, and the creep properties are compared with those of traditional B and N content steels. The relationship between the stability of lath structure and precipitates and the creep strength of steels is also explored, along with future prospects of this alloying modification.
Article
Materials Science, Multidisciplinary
A. Fedoseeva, V Dudko, N. Dudova, R. Kaibyshev
Summary: The addition of 3% Co alloy can significantly increase the tensile strength of P92-type steel at elevated temperatures, mainly through the strengthening of martensitic laths and dislocations. In addition, the influence of Co on the interaction of free lattice dislocations with secondary particles or solid solution is negligible.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Roman Mishnev, Yuliya Borisova, Sergey Gaidar, Tatiana Kniaziuk, Olga Vagina, Rustam Kaibyshev
Summary: After quenching and low-temperature tempering, the mechanical properties of Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel were significantly improved, leading to increased ductility and yield strength.
Article
Engineering, Mechanical
N. Dudova, R. Mishnev, R. Kaibyshev
Summary: The correlation between cyclic softening and microstructural evolution was studied in a 10%Cr steel tested at 650°C using interrupted low cycle fatigue (LCF) tests with a low strain amplitude of ±0.2%. It was found that cyclic softening was mainly attributed to a decrease in friction stress due to dislocation annihilation, while back stress remained more stable due to additional precipitation on the lath boundaries despite intense lath widening caused by the disappearance of lath boundaries.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Roman Mishnev, Yuliya Borisova, Tatiana Kniaziuk, Sergey Gaidar, Rustam Kaibyshev
Summary: The effect of tempering after water quenching on the strength and fracture toughness of two steels with specific chemical compositions was studied. The precipitation of transition ?-Fe2C carbides in martensitic matrix increased fracture toughness and eliminated quench embrittlement in one of the steels. On the other hand, tempered martensite embrittlement at higher tempering temperature resulted in decreased impact energy, ductility, and strength and elongation for the other steel.
Article
Engineering, Mechanical
Miloslav Kepka, Miloslav Kepka Jr, Radovan Minich
Summary: This paper focuses on the fatigue life evaluation of the bodywork of a new articulated electric (battery) bus. The findings resulted in recommendations to improve the operational reliability of a particular vehicle and provided challenges for future research.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
T. Dusautoir, B. Berthel, S. Fouvry, P. Matzen, K-D. Meck
Summary: This study investigates the impact of post-processing treatments on the fatigue limit of additive manufactured Ti-6Al-4V under stress gradients, with a focus on surface integrity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhuofan Xia, Di Wu, Xiaochen Zhang, Jianqiu Wang, En -Hou Han
Summary: The study reveals the surface-initiated rolling contact fatigue (RCF) failure mechanism under heavy load and initial high roughness surface. The results indicate that precursor of collapsed morphology and nanocrystalline layer are the main factors causing lower RCF life with high roughness compared to low roughness surfaces. The spalling failure initiating from low roughness surface under heavy load is strongly dependent on surface plastic deformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Daniel Gren, Knut Andreas Meyer
Summary: Rolling contact loading can cause plastic deformation and fatigue cracks. Current rail standards do not consider the effect of plasticity on mechanical behavior. This study proposes a new method for evaluating the fatigue life of deformed material and finds that superimposed compressive axial loads can increase fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
R. Kumar, S. Sanyal, J. Bhagyaraj, E. Hari Krishna, S. Mukherjee, K. Prasad, S. Mandal
Summary: This study investigates the thermomechanical fatigue (TMF) behavior of Timetal 834 alloy under different loading conditions. The results show that the alloy exhibits different cyclic hardening and softening responses at different strain amplitudes. The strain amplitude and phase angle have significant effects on the TMF life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kai Donnerbauer, Tobias Bill, Peter Starke, Ruth Acosta, Bharath Yerrapa, Christian Boller, Klaus Heckmann, Frank Walther
Summary: Given the aging of nuclear power plants, it is important to develop methods for evaluating the integrity of components and structures in nuclear engineering. Suitable nondestructive testing methods can detect material degradation and determine its fatigue life. This study utilized various NDT parameters and scanning electron microscopic methods to explore the relationship between microstructure evolution and NDT data.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Liuyong He, Jiang Zheng, Tianjiao Li, Houkun Zhou, Lihong Xia, Bin Jiang
Summary: This study quantitatively analyzed the effects of precipitates on the deformation mode, cracking mode, and mechanical behavior of WE54 magnesium alloy during low-cycle fatigue. It was found that precipitates promoted the activation of dislocation slip and suppressed the activation of twinning, affecting the cracking mode and mechanical behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Tongguang Zhai, Xiaomei He, Kangkai Song, Zhuohang Xie
Summary: The cyclic deformation behaviors and damage mechanisms of pure Zr were investigated. The cyclic stress response was mainly influenced by substructure evolutions. Prismatic < a > dislocation slip was identified as the dominant deformation mechanism. Fatigue damage was not only influenced by the initial texture, but also other factors.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Jingyu Yang, Bingbing Li, Yiming Zheng, Gang Chen, Xu Chen
Summary: Heat treatment is used to improve the low-cycle fatigue performance of additive manufactured 316LN stainless steel. The heat-treated material demonstrates initially cyclic hardening followed by softening behavior, and shows a stronger resistance to crack propagation compared to the as-built material, resulting in a longer fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Lang Zou, Dongfang Zeng, Xiong Chen, Jun Li, Hai Zhao, Liantao Lu
Summary: This study investigates the competitive relationship between fretting fatigue and plain fatigue in press-fitted railway axles. By changing the depth of the stress relief groove, the plain fatigue limit and fretting fatigue strength were tested. Detailed information was gathered, and an evaluation methodology integrating finite element simulation and the Modified Wohler Curve Method was established. The study concludes that the optimal groove depth, which balances the anti-fatigue capabilities, depends on the number of test cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Davide Leonetti, Koji Kinoshita, Yukina Takai, Alain Nussbaumer
Summary: This paper investigates the fatigue behavior of non-load-carrying transverse welded steel attachments, including fatigue crack monitoring and fracture surface analysis under constant and variable amplitude loading. A procedure is proposed to obtain a Markov transition matrix based on the measured strain signal and to randomly resample the stress history for variable amplitude fatigue tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhe Zhang, Bing Yang, Yuedong Wang, Shoune Xiao
Summary: This paper presents a method for designing fatigue life prediction models with small sample sizes by handling limited sample data. The method integrates the equivalent structural stress method with the maximum likelihood estimation method and adds reliability verification, resulting in enhanced goodness of fit, stability, and optimized sample quantity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Cooper K. Hansen, Gary F. Whelan, Jacob D. Hochhalter
Summary: This paper presents a method to address the computational demand issue of computing FIPs using CPFEM by developing an interpretable machine learning model. Genetic programming is used to evolve interpretable expressions of FIPs from microstructure features, and these models can serve as efficient substitutes for CPFEM and be easily integrated into engineering workflows.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Luca Susmel
Summary: This paper discusses the problem of estimating notch fatigue limits using machine learning. The results show that machine learning is a promising approach for designing notched components against fatigue. The accuracy in estimating the fatigue limit can be increased by increasing the size and quality of the calibration dataset, as well as including additional input features.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kefeng Gao, Guoqi Tan, Yanyan Liu, Qiang Wang, Qian Tang, Xuegang Wang, Qiqiang Duan, Zengqian Liu, Zhe Yi, Zhefeng Zhang
Summary: Bioinspired architectures have significant effects on material enhancement. This study investigates the fatigue properties of bioinspired ceramic-polymer composites and natural nacre, revealing the close relationship between architectural types, orientations, fatigue performance, and damage mechanisms.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
