Article
Engineering, Mechanical
Marcio Abreu, Jessica Elfsberg, Stefan Jonsson
Summary: The cavitation erosion mechanisms of three austempered ductile irons (ADIs) of different hardness levels were studied in a heavy-duty engine coolant, showing that higher hardness resulted in lower relative mass loss rates.
Article
Chemistry, Physical
Michael Fitzka, Bernd M. Schoenbauer, Robert K. Rhein, Niloofar Sanaei, Shahab Zekriardehani, Srinivasan Arjun Tekalur, Jason W. Carroll, Herwig Mayer
Summary: This study summarizes the comparability of fatigue properties measured with ultrasonic and conventional equipment, focusing on the performance of different materials at ultrasonic frequencies. Aluminium alloys and high-strength steels are insensitive to cycling frequency, while the strain rate sensitivity of ferrite may lead to prolonged lifetimes.
Article
Materials Science, Multidisciplinary
Nelly Abigail Rodriguez-Rosales, Felix Alan Montes-Gonzalez, Oziel Gomez-Casas, Josue Gomez-Casas, Jesus Salvador Galindo-Valdes, Juan Carlos Ortiz-Cuellar, Jesus Fernando Martinez-Villafane, Daniel Garcia-Navarro, Carlos Rodrigo Muniz-Valdez
Summary: This research evaluates the effect of temperature and time austempering on the microstructural characteristics and hardness of ductile iron. The results show that increasing austempering temperature leads to a higher content of carbon-rich austenite and a change in the morphology of ferrite needles. Additionally, an increase in austempering time results in a thickening of ferrite needles. The hardness values exhibit an inversely proportional behavior and a regression model achieves a correlation of about 97%. The proposed mathematical model predicts the hardness of austempered ductile iron with an accuracy of 95.20%.
Article
Metallurgy & Metallurgical Engineering
G. Meneghetti, A. Campagnolo, D. Berto, E. Pullin, S. Masaggia
Summary: The present study aims to compare the fatigue behavior of dissimilar joints to the categories of the corresponding homogeneous steel welded joints, as suggested in International Standards and Recommendations. Experimental fatigue tests were performed on a selection of dissimilar welded details, including analysis of microstructure, hardness measurements, and residual stress profiles.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Dogancan Eraslan, Ahmet Balci, Baris Cetin, Necati Ucak, Adem Cicek, Okan Deniz Yilmaz, Kemal Davut
Summary: In engineering applications, selecting the proper material is crucial for productivity and cost reduction. The characteristics of material and ease of cutting directly impact production costs. Different cutting conditions and tool materials can help reduce cutting forces, surface roughness, and tool wear.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Pedro R. da Costa, Luis Reis, Manuel Freitas
Summary: Ultrasonic fatigue testing is a method that uses resonance to achieve very high cyclic load frequencies for studying high cycle fatigue. This study modified the geometry of the specimen and conducted numerical and experimental modal behavior analysis to achieve reliable multiaxial fatigue testing. The results prove a clear trend in crack propagation details with the increase of the induced stress ratio.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Chen Liu, Yuzhou Du, Xin Wang, Qi Zheng, Xinyu Zhu, Dongya Zhang, Dongjie Liu, Chao Yang, Bailing Jiang
Summary: The tribological behavior of quench-tempered ductile iron (QTDI) and austempered ductile iron (ADI) with similar hardness was investigated. QTDI was composed of cementite particles, ferrite and spheroidal graphite, whilst ADI was consisted of acicular ferrite, retained austenite and spheroidal graphite. Wear tests indicated that QTDI exhibited a lower friction coefficient than ADI. However, ADI had a better wear resistance than QTDI, which was because the transformation of re-sidual austenite into martensite induced by friction stress resulted in the increase of surface hardness. Worn surface morphology indicated that the main wear mechanisms of QTDI was adhesive and abrasive wear. How-ever, the surface fatigue wear was observed for ADI.
Article
Nanoscience & Nanotechnology
Xin Wang, Yuzhou Du, Baojian Liu, Bailing Jiang
Summary: In this study, the effects of partitioning treatment on the microstructure and mechanical properties of austempered ductile iron (ADI) were investigated. The carbon atoms were transported from alpha phase to gamma phase during the partitioning process, leading to changes in the microstructure and an increase in plasticity by about 50% without sacrificing strength in the ADI sample.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Penghui Yang, Rong Wang, Hanguang Fu, Rafik Absi, Rachid Bennacer, Xuhui Yang, Peiqing La
Summary: This study aims to investigate the wear properties of titanium microalloying Carbidic Austempered Ductile Iron (CADI) and the refining mechanism of TiC on M3C carbides through theoretical calculation and experimental analysis. Wet rubber wheel wear tests showed that TiC particles could precipitate in the melt to refine the M3C eutectic carbides, and the M3C (010)/TiC (011) interface remained stable. Experimental results demonstrated the formation of TiC particles, and the shape of M3C eutectic carbides changed from net-like to strip-like after titanium microalloying, thereby improving the wear resistance of CADI.
Article
Chemistry, Physical
Andrzej N. Wieczorek, Mateusz Wojcicki, Andrzej Drwiega, Waldemar Tuszynski, Pawel M. Nuckowski, Jakub Nedza
Summary: This paper explores the resistance of alloyed austempered ductile iron chain wheels to dynamic and abrasive wear by solid particles, and the synergistic effect of external dynamic forces and quartz particles on wear. It was found that shot peening decreased the surface hardness of the chain wheels, while increasing the abrasive wear. The study demonstrates phase changes during wheel operation and the varying impact of environmental factors, providing practical insights for the selection of ADI cast iron in different conditions.
Article
Chemistry, Physical
Halina Krawiec, Janusz Lelito, Marek Mroz, Magdalena Radon
Summary: The influence of heat treatment parameters such as annealing time and austempering temperature on the microstructure, tribological properties, and corrosion resistance of ductile iron has been studied. It has been found that increasing the isothermal annealing time and austempering temperature leads to an increase in scratch depth and a decrease in hardness. The presence of martensite at low austempering temperature and short annealing time is associated with a low scratch depth and high hardness. Additionally, the presence of martensite improves the corrosion resistance of austempered ductile iron.
Article
Materials Science, Multidisciplinary
H. Krawiec, V. Vignal, J. Lelito, A. Krystianiak, P. Ozga
Summary: The corrosion behavior of austempered ductile iron (ADI) under cyclic salt spray exposure was studied using a specific three-electrode cell located in the salt fog chamber. Three steps were identified, namely pitting corrosion of ferrite, inward oxidation of the ausferrite matrix and mixed oxidation of the matrix accompanied by rust layer formation. Corrosion rate evolution calculated from in-situ electrochemical measurements correlated with surface changes quantified from optical and field emission scanning electron (FE-SEM/EDS) microscopies. Corrosion products were identified using micro-Raman spectroscopy.
Article
Engineering, Mechanical
Fatma Bayata, Sueleyman Batuhan Vatan
Summary: This study developed austempered ductile iron (ADI) with desired mechanical properties for crankshaft applications by using vanadium alloying and an optimized heat treatment process. Different bainitic structures were obtained through austempering, leading to diverse combinations of mechanical properties. The V-alloyed samples exhibited finer microstructures and more acicular ferrite phases, with improved mechanical properties. The addition of vanadium also significantly affected the retained austenite phases, providing favorable ductility and toughness to the V-15 samples.
FRONTIERS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Ridvan Gecu
Summary: In this study, spheroidal graphite cast irons with different aluminum additions were fabricated by green sand casting and subjected to wear tests. The results showed that the addition of aluminum decreased the ultimate tensile strength and hardness of the cast irons, but increased their impact strength. The wear resistance of the samples increased with sliding speed, but decreased with applied load. Among all samples, the cast iron with 4 wt% aluminum addition exhibited the best wear resistance.
TRIBOLOGY TRANSACTIONS
(2022)
Article
Engineering, Mechanical
Shawn L. Kiser, Marc Rebillat, Mikhail Guskov, Nicolas Ranc
Summary: Ultrasonic fatigue tests are used to study the fatigue life behavior of metallic components undergoing a high number of cycles under low mechanical loads. This paper introduces a spectral estimation method for extracting vibration signal parameters and recommends suitable algorithms for processing experimental data obtained from ultrasonic fatigue tests.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
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)