Article
Engineering, Mechanical
V Gray, J. P. Jones, M. T. Whittaker, R. J. Lancaster, C. J. Pretty, S. J. Williams
Summary: This study focuses on the TMF behavior of aerospace nickel based superalloy RR1000, proposing an elastic modulus normalization technique to predict material life, with a specific emphasis on the impact of phase angle in TMF lifing.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Jingyu Sun, Shun Yang, Huang Yuan
Summary: The study shows that the lifetime of nickel-based single-crystal superalloy CMSX-4 under thermo-mechanical fatigue and thermal gradient mechanical fatigue loading conditions is significantly affected by temperature gradient. Conventional fatigue models fail to accurately describe this, emphasizing the need to consider temperature gradient and thermal-mechanical phase angle effects.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Michal Bartosak, Jakub Horvath, Zdenek Pitrmuc, Marie Rohlova
Summary: The phase angle in TMF tests has a significant influence on the dominant damage mechanism and observed lifetime. A modified damage model has been proposed to account for the effect of the phase angle.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Aiyeshah Alhodaib, Pragya Shandilya, Arun Kumar Rouniyar, Himanshu Bisaria
Summary: The use of powder mixed electrical discharge machining (PM-EDM) with added silicon powder to kerosene oil resulted in a significant decrease in surface roughness and recast layer thickness compared to pure kerosene. Spark on duration was identified as the most significant parameter for both surface roughness and recast layer thickness. The optimized process parameters led to the minimum surface roughness and the thinnest recast layer thickness.
Article
Materials Science, Multidisciplinary
Yuxin Xu, Xiaoming Qiu, Suyu Wang, Jinlong Su, Fei Xing, Hongzhan Wang
Summary: This study reveals the mechanistic correlation between multi-interfacial structures from meso-scale to atomic-scale and high temperature thermo-mechanical responses in tungsten heavy alloy (WHA) and superalloy dual-metallic structures fabricated by vacuum brazing techniques for future fusion reactor applications. The fatigue defect propagation mechanisms induced by thermal cycling load were analyzed, and the underlying cause of fatigue cracks and intragranular voids was illustrated. This work provides important insight into the critical engineering challenges of WHA dissimilar joining systems and guides future anti-thermal fatigue designs.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Stoichko Antonov, Kyle A. Rozman, Paul D. Jablonski, Martin Detrois
Summary: With the increasing temperature and pressure requirements in land-based turbines for power generation, the study of high-temperature alloys becomes more important. This study investigated the effect of carbon content on the fabrication and properties of Nimonic 105 alloy. Lowering the carbon content improved the creep property and grain size, but also presented challenges in fabrication. Prolonged thermal exposure resulted in complex carbide phase transformation in the low-carbon variant.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zihao Tan, Xinguang Wang, Jianchao Pang, Mingke Zou, Yan Tao, Xipeng Tao, Chenglu Zou, Yanhong Yang, Jide Liu, Jinlai Liu, Jinguo Li, Yizhou Zhou, Xiaofeng Sun
Summary: Comparable investigation was conducted on pore-induced defects during in-phase (IP) and out-of-phase (OP) thermo-mechanical fatigue (TMF) in fourth-generation single crystal superalloy. It was found that recrystallizations and deformation twins formed near micro-pores in IP and OP cycling, respectively. High-resolution observation revealed that the increase of a/6(112) twinning dislocations and the more frequent activation of (112){111) viscous slipping during OP-TMF contributed to twinning nucleation. Atom-scale mapping further showed the dual effect of Re, Co, and Cr in promoting twinning formation and hindering partial dislocations movement. The accumulation of pore-induced twins was considered to cause premature fracture of the alloy during OP-TMF.
MATERIALS RESEARCH LETTERS
(2023)
Article
Mathematics
J. Fakrudeen Ali Ahamed, Pandivelan Chinnaiyan
Summary: The main goal of this study is to investigate the formability of Nimonic 90 sheet, which is suitable for high temperature and pressure applications in industries such as aerospace, processing, and manufacturing. Finite element analysis (FEA) and process parameter optimization were performed to study the formability of Nimonic 90 in sheet hydroforming. Mechanical properties of the material were obtained through uniaxial tensile tests, and the maximum pressure for sheet hydroforming was determined using FEA and experimentally validated. Box-Behnken design (BBD) was used to investigate various process parameters, and analysis of variance (ANOVA) results showed that pressure and thickness were the most effective parameters for achieving maximum deformation without failure. Response surface methodology (RSM) optimizer was utilized to predict optimized process parameters, and experimental validation confirmed the accuracy of the simulation results. The study concludes that the regression model and FEA simulation were effective in predicting the response values.
Article
Materials Science, Multidisciplinary
Kolla Lakshman Rao, Amit Kumar Gupta
Summary: An experimental investigation on Nimonic 263 alloy using constrained groove pressing (CGP) at various temperatures was carried out to improve its mechanical and microstructural properties. The CGPed specimens exhibited substantial improvements in yield strength, ultimate tensile strength, and micro hardness compared to the as-received material. XRD results showed an increase in peak intensity, a decrease in crystal size, and an improvement in dislocation density after the CGP process. Fractography studies revealed a mixed-mode failure for the CGPed specimens. Finite element analysis confirmed the effectiveness of the CGP process in improving the alloy's properties.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Coatings & Films
Ali Gunen, Kadir Mert Doleker, Mehmet Erdi Korkmaz, Mustafa Sabri Gok, Azmi Erdogan
Summary: The nickel-based superalloy Nimonic 80A was borided using silicon-free boriding powders at temperatures of 850°C and 950°C for 2-4 hours, resulting in a smooth boride layer mainly composed of Ni2B with minor amounts of CrB, Cr2B, and Cr5B3. The hardness and elastic modulus of the boride layer increased with chromium content, while fracture toughness decreased. Boriding treatments improved dry sliding wear resistance, with higher values achieved with increased time and temperature, although they had no significant effect on oxidation resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Zhang Lu, Yu Zhiwei, Zhang Leicheng, Jiang Rong, Song Yingdong
Summary: Under complex cyclic force/thermal multifield coupled service conditions, thermo-mechanical fatigue (TMF) failure is a common failure type of aeroengine turbine disks. In this study, in-phase (IP) and out-of-phase (OP) TMF tests were conducted on the GH4169 superalloy. The results showed that the TMF stress-strain curves exhibited tensile-compression stress asymmetry, and cyclic softening was observed in the high-temperature half-cycle. The TMF life was shorter than the isothermal fatigue life at the peak temperature under the same strain amplitude. Fracture analysis revealed transgranular fracture for OP TMF cracks and intergranular fracture for IP TMF cracks.
ACTA METALLURGICA SINICA
(2023)
Article
Automation & Control Systems
Tej Patel, Navneet Khanna, Sahitya Yadav, Prassan Shah, Murat Sarikaya, Dilpreet Singh, Munish Kumar Gupta, Nitin Kotkunde
Summary: This study compares the performance differences between using liquid carbon dioxide and traditional mineral oil-based flood coolant in machining Nimonic 90 alloy, finding that cryogenic turning with liquid carbon dioxide can reduce cutting forces and decrease tool wear compared to wet machining.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Jie Shen, Xiaoan Hu, Dong Mi, Zhengming Qian, Xuefeng Teng, Xing Song, Yun Jiang, Xiangfan Nie
Summary: This study investigates the thermomechanical fatigue behavior and life prediction of PM superalloy under various mechanical strain amplitudes and phase angles. A modified energy-based life prediction model is proposed by considering the effects of phase angle and tensile mean temperature. Machine learning methods are also used for life prediction.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Yazdan Shajari, Majid Beigi, Mohammad Porhonar
Summary: The microstructure of superalloy gas turbine damping bolt was investigated in this study. It was found that the microstructure became complex due to long-term service, with the appearance of Sigma and Mayo phases near the grain boundaries. Secondary continuous carbides and gamma' precipitates formed, leading to increased hardness and reduced creep life.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Multidisciplinary Sciences
Renu K. Shastri, Chinmaya P. Mohanty
Summary: Nimonic C263, a nickel-based superalloy, is widely used in manufacturing complex parts in the gas turbine, aircraft and automotive industries for exhaust sections. Traditional machining of this alloy is difficult due to its poor thermal conductivity, work hardening, and high strength properties. This study proposes an experimental investigation to explore the machinability of Nimonic C263 using different electrodes and evaluates the impact of process parameters on responses such as energy consumption, noise, material removal rate, electrode wear rate, surface roughness, and radial overcut. Analysis of variance and scanning electron microscope investigation are conducted to analyze the influence of each parameter and pre/post-machining scenarios. The study utilizes the PROMETHEE approach to convert multiple responses into a single response and further improves the results using a hybrid cuckoo search algorithm, showing an overall improvement of 6.02% in the responses.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
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)