Article
Engineering, Multidisciplinary
Barna Szabo, Ricardo Actis, David Rusk
Summary: The study focused on improving the prediction of high-cycle fatigue failure initiation by modifying the predictor to account for biaxial out-of-phase loading, and validated the new model through three biaxial out-of-phase fatigue tests.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Bingnan Qian, Lola Lilensten, Jinyong Zhang, Min Yang, Fan Sun, Philippe Vermaut, Frederic Prima
Summary: The diverse pathways of deformation-induced transformations in the beta-metastable Ti-12Mo alloy displaying combined TWIP were investigated via two different ways.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Aya Matsushita, Yoji Mine, Kazuki Takashima
Summary: The addition of nanotwin bundles in 304 metastable austenitic stainless steel enhances fatigue crack growth resistance by inhibiting brittle twin boundary separation and promoting detwinning and martensite formation during crack propagation.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Tianwei Liu, Lunwei Liang, Dierk Raabe, Lanhong Dai
Summary: This study provides new evidence and insights into the martensitic transformation in carbon steels through transmission electron microscopy. The migration pathway and underlying mechanisms of this transformation are revealed, shedding light on nanostructural control of metals and alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Michal Jambor, Tomas Vojtek, Pavel Pokorny, Miroslav Smid
Summary: The study focused on fatigue crack propagation in near-threshold regime of 304L austenitic stainless steel in two microstructural states. It was found that the threshold for crack propagation was higher in the solution-annealed state by 1 MPa·m(0.5) compared to the as-received state, attributed to crack tip shielding induced by phase transformation.
Article
Engineering, Mechanical
Xiwang Lan, Bo Hu, Shaofei Wang, Weitao Luo, Ping Fu
Summary: This study examines the magnetic signal and mechanism of 304 austenitic stainless steel under fatigue. The microstructure's evolution and the mechanism of magnetic characteristics are discussed. The magnetic signal and mechanism vary in three fatigue stages. A differential magnetic signal processing method for detecting fatigue damage failure in 304 austenitic stainless steel is proposed.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Nanoscience & Nanotechnology
Q. Li, D. Y. Liu, F. K. Yan, N. R. Tao
Summary: The study revealed that the activation of alpha\prime-martensitic transformation in nanotwinned 316L stainless steel can enhance both fatigue strength and fatigue life in the low-cycle regime by effectively releasing stress/strain localization.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Myeong-heom Park, Reza Gholizadeh, Ranjit Kumar Ray, Mitsuhiro Murayama, Nobuhiro Tsuji
Summary: Low-carbon multi-phased steels with transformation induced plasticity (TRIP) effect have attracted significant attention for automotive applications due to their superior mechanical balance between strength and ductility. However, the complex microstructural evolutions during thermo-mechanical processing and the influence of constituent phases on mechanical properties have not been fully understood. In this study, the formation process of multi-phased microstructures in a low alloy steel during intercritical annealing and subsequent partitioning heat-treatment were systematically investigated. The phase fractions of ferrite, martensite, and retained austenite were found to change significantly with increasing holding time at lower temperature. Newly formed ferrite was observed to transform from austenite through massive or bainitic transformation, resulting in different types of ferrite in the final microstructures. The presence of retained austenite was attributed to interstitial carbon diffusion, leading to improved tensile elongation and TRIP effect during deformation. The best strength-ductility balance was achieved with the shortest heat-treatment at lower temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Cedric Gourdin, Gregory Perez, Hager Dhahri, Laurent De Baglion, Jean-Christophe Le Roux
Summary: This paper introduces a new device, FABIME2e, developed for quantifying the effect of a PWR environment on disk specimens, combining structural effects and environmental penalty effects.
Article
Engineering, Mechanical
Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Susumu Takamori, Satoshi Emura, Yasuhiko Inoue
Summary: A bidirectional transformation mechanism (B-TRIP) between gamma-austenite and epsilon-martensite has been utilized to develop fatigue-resistant steel with high reversibility in dislocation motion. By modifying the Fe-15Mn-11Cr-7.5Ni-4Si steel, the Fe-18Mn-11Cr-7.5Ni-4Si B-TRIP steel was designed and showed a two-fold improvement in fatigue life compared to the previous steel. Microstructural analysis revealed that the enhanced irreversible alpha'-martensitic transformation in the previous steel negatively affected the durability of B-TRIP.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
J. H. Liu, N. Binot, D. Delagnes, M. Jahazi
Summary: The influence of cooling rate below the martensite start temperature on the kinetics of martensitic transformation in medium carbon low alloy steel was studied. Two-stage transformation was observed for slow cooling rates, while single-stage process was observed at higher cooling rates. A new equation was proposed to model the evolution of martensitic transformation, taking into account the post Ms cooling rate and contributions from initial austenite and carbon enriched austenite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Ali Ameri, Hongxu Wang, Zongjun Li, Zakaria Quadir, William D. A. Rickard, Manny Gonzalez, Paul J. Hazell, Juan P. Escobedo-Diaz
Summary: Microstructural changes and ferrite phase transformation under shock loading between 8.5 GPa and 17.5 GPa in a hot-rolled Lean Duplex Stainless Steel were investigated, revealing a reversible phase transformation in ferrite at a peak stress of around 17 GPa, leading to a considerable increase in yield stress.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Masayoshi Kumagai, Masatoshi Kuroda, Takashi Matsuno, Stefanus Harjo, Koichi Akita
Summary: This study investigated the stress response of austenitic stainless steel using neutron diffraction and found that there is stress sharing between austenite and martensite. The actual stress in the martensite is about half of the assumed stress and the phase stress in the austenite, and the martensite contains a large compressive residual stress.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Xiliang Zhang, Shengjia Gai, Tao Liu, Yindong Shi, Yanhui Wang, Qian Zhou, Zhenguo Xing, Hongji Liu, Zhibo Zhai
Summary: A medium Mn steel with multi-gradient microstructure was treated using a pre-torsion and intercritical annealing treatment. The gradient structured sample exhibited improved strength and ductility compared to the homogenous counterpart, with an increase in yield strength and total elongation by approximately 49% and 68% respectively. The formation of a reverse gradient structure during tensile strain led to improved ductility through persistent TRIP effect and HDI hardening.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Zongchi Wang, Shouwen Shi, Jingtai Yu, Bingbing Li, Yajing Li, Xu Chen
Summary: In this paper, the cryogenic cyclic plastic strengthening (CCPS) method was used to strengthen 304 austenitic stainless steel, resulting in a material that combined multiscale structure and transformation-induced plasticity (TRIP) effect. After strengthening, harder small α'-martensite particles were formed in the austenite coarse grains, leading to dynamic strain partitioning during uniaxial tension tests at room temperature. Furthermore, martensitic transformation occurred steadily throughout the strain range of the tensile tests. At room temperature, the characteristics of cryogenic transformation were maintained and the saturation value of the transformation was increased. The strengthened material exhibited an excellent combination of high strength and ductility at room temperature.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Christina Burkhardt, Ruben Wagner, Christine Baumgart, Johannes Guenther, Lutz Krueger, Horst Biermann
ADVANCED ENGINEERING MATERIALS
(2020)
Article
Engineering, Mechanical
Mikhail Seleznev, Anja Weidner, Horst Biermann
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Engineering, Mechanical
Alexander Schmiedel, Sebastian Henkel, Thomas Kirste, Roman Morgenstern, Anja Weidner, Horst Biermann
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Chemistry, Physical
Christian Duereth, Daniel Weck, Robert Boehm, Mike Thieme, Maik Gude, Sebastian Henkel, Carl H. Wolf, Horst Biermann
Article
Engineering, Mechanical
Stephan Andre Bohme, Alexei Vinogradov, Horst Biermann, Anja Weidner, Alexander Schmiedel, Sebastian Henkel
Summary: This study presents a testing and modelling concept aimed at estimating the local fatigue properties of carburised CrNiMo steel, with all specimens ultrasonic shot-peened prior to testing. Fractographic analyses were conducted on all specimens to define crack initiation-related discontinuities, and an iteration of the FKM guideline was presented to explain the effect of large internal notches on mean stress sensitivity.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Saeed M. Jafarpour, Andrei Pipa, Alexander Puth, Anke Dalke, Juergen Roepcke, Jean-Pierre H. Van Helden, Horst Biermann
Summary: The study compared the effects of two active screen materials on low-temperature plasma nitrocarburizing treatments, finding that in a biased condition, the use of a carbon-fiber-reinforced carbon active screen can increase the thickness of the nitrogen-expanded austenite layer while decreasing the thickness of the carbon-expanded austenite layer.
Article
Chemistry, Physical
Caroline Quitzke, Qiuliang Huang, Horst Biermann, Olena Volkova, Marco Wendler
Summary: This study investigated the effect of interstitial contents on the mechanical properties and strain-induced martensite formation in an austenitic stainless steel. The results showed that carbon provides a stronger austenite stabilizing effect than nitrogen, with steel alloyed with higher carbon content exhibiting optimal mechanical properties. Additionally, the interstitial content influences the occurrence of dynamic strain aging, with carbon playing a key role in this phenomenon.
Article
Chemistry, Physical
Matthias Droste, Ruben Wagner, Johannes Guenther, Christina Burkhardt, Sebastian Henkel, Thomas Niendorf, Horst Biermann
Summary: The austenitic steel processed by electron beam powder bed fusion (PBF-EB) exhibits a robust cyclic crack growth behavior, with minimal influence from microstructure and building direction.
Article
Chemistry, Physical
Tilo Zienert, Dirk Endler, Jana Hubalkova, Goekhan Guenay, Anja Weidner, Horst Biermann, Bastian Kraft, Susanne Wagner, Christos Georgios Aneziris
Summary: Niobium-alumina aggregate fractions with particle sizes up to 3150 μm were produced through crushing pre-synthesised fine-grained composites. XRD analysis revealed phase separation with niobium enrichment in the aggregate class 45-500 μm. The absence of organic additives in the castable mixtures led to high water demands and open porosities in the fine- and coarse-grained composites.
Article
Materials Science, Multidisciplinary
Alexander Schmiedel, Christina Burkhardt, Sebastian Henkel, Anja Weidner, Horst Biermann
Summary: The fatigue lives of additively manufactured Inconel 718 were found to be significantly reduced compared to conventional wrought materials, which was attributed to differences in microstructure. The AM material exhibited large columnar grains and porosity, while the wrought material had a fine-grained structure with non-metallic inclusions. Fatigue crack initiation mechanisms also differed between the two materials.
Article
Chemistry, Multidisciplinary
Jan Boecker, Anke Dalke, Alexander Puth, Christian Schimpf, Juergen Roepcke, Jean-Pierre H. van Helden, Horst Biermann
Summary: The study explored the effect of controlled oxygen admixture in plasma nitrocarburizing process for carburizing potential control. It was found that oxygen addition led to formation of oxygen-containing species, reduced concentrations of hydrocarbons and HCN, and increased nitrogen and carbon diffusion depth. Additionally, increasing local nitrogen concentration altered the stoichiometry of the compound layer, providing additional degrees of freedom for improved process control.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Mikhail Seleznev, Christoph Renzing, Matthias Schmidtchen, Ulrich Prahl, Horst Biermann, Anja Weidner
Summary: Manufacturing laminated composites of high-alloy TRIP and TWIP steels via CRB results in high ultimate tensile strength and elongation, with DLs playing a significant role in bonding and affecting peel strength at the interface. Bonding of laminate layers occurs between DL fragments.
Article
Materials Science, Multidisciplinary
Matthias Droste, Sebastian Henkel, Horst Biermann, Anja Weidner
Summary: This study investigates metastable austenitic stainless steel during fatigue tests under strain control and focuses on the influence of different microstructures on fatigue life. Additionally, a proposed approach for calculating parameters based on strain-controlled tests is introduced to estimate fatigue life for materials undergoing secondary hardening due to martensitic phase transformation.
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)
