Article
Metallurgy & Metallurgical Engineering
Pan Qingsong, Cui Fang, Tao Nairong, Lu Lei
Summary: Engineering nano-scale twin boundaries is a novel strategy to achieve superior mechanical properties in metallic materials. However, the fatigue behavior of nanotwin-strengthened metals has been rarely explored. In this study, a bulk heterogeneously structured stainless steel containing nanotwin bundles was prepared and investigated under fatigue tests. The nanotwin-strengthened steel exhibited longer fatigue life and higher cyclic flow stress compared to its coarse-grained counterpart. These improved fatigue properties were attributed to the presence of high-strength nanotwin structure and its co-deformation with surrounding grains.
ACTA METALLURGICA SINICA
(2022)
Article
Materials Science, Multidisciplinary
Lv Jinlong, Wang Zhuqing
Summary: The study optimized the recrystallized microstructures of 316L stainless steel through twice cold rolling and reversed transformation annealing, resulting in improved strength and plasticity. The method significantly increased the strength of the stainless steel while maintaining better ductility.
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
Materials Science, Multidisciplinary
Javad Mola, Guoqing Luan, Qiuliang Huang, Christiane Ullrich, Olena Volkova, Yuri Estrin
Summary: Discontinuous plastic flow due to dynamic strain aging in a Fe-13Cr-3.4Mn-0.47C metastable stainless steel was studied, with different mechanisms proposed for different temperature intervals. The study identified deformation-induced martensitic transformation and carbon diffusion as key processes in DSA at various temperatures.
Article
Nanoscience & Nanotechnology
Ting-Ting Chen, Jing Wang, Yi Zhang, Ping Jiang, Fu-Ping Yuan, Pei-De Han, Xiao-Lei Wu
Summary: Gradient structure (GS) design, with deformation twin-density as a gradient variable, is proposed to enhance the synergy between strength and ductility. Tensile tests show that the GS exhibits a significant increase in yield strength while maintaining comparable ductility. The presence of mechanical hysteresis loops and the interaction between deformation twins and dislocations contribute to the improved mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Qingsong Pan, Song Guo, Fang Cui, Lijun Jing, Lei Lu
Summary: Materials with designed gradient nanograins show exceptional mechanical properties, such as superior strength and ductility. This study demonstrates that a heterostructured 304 stainless steel with solely gradient dislocation structure (GDS) exhibits substantially improved yield strength with slightly reduced uniform elongation compared to its coarse grained counterparts. Microstructural observations reveal that multiple deformation mechanisms, including the formation of dense dislocation patterns, deformation twins and martensitic phase, contribute to the delocalized plastic deformation and superior mechanical performance of the GDS 304 stainless steel.
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
Hongzhuang Zhang, Mengtao Xu, Zhendong Liu, Changyou Li, Yimin Zhang
Summary: The stored energy induced by SLM process and cyclic strain during fatigue testing can trigger grain boundary migration and local recrystallization behavior, impacting the fatigue performance of stainless steel. Understanding the role of local recrystallization in fatigue failure mechanisms of additively manufactured materials is essential for further research and development in this field.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Cheng Luo, Huang Yuan
Summary: In this study, the deformation-induced martensitic transformation in metastable austenitic steel was monitored in situ using the magnetic permeability method. The magnetic response and Villari effect under cyclic loading were systematically investigated. Phenomenological and stress partitioning models were proposed to describe the variation of martensitic phases and the distribution of macroscopic stress among constituent phases.
Article
Engineering, Mechanical
Zeinab Y. Alsmadi, K. L. Murty
Summary: High-temperature creep-fatigue behavior of Alloy 709 was investigated through strain-controlled tests at 650°C and 750°C, revealing fluctuations in creep-fatigue life at 650°C due to Dynamic Strain Aging. Linear damage summation (LDS) was used to create a creep-fatigue interaction diagram, showing increased crack and creep cavity density at 750°C compared to 650°C.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Ming Chen, Jiansheng Li, Huabing Liu, Mengmeng Wang, Shilong Xing, Yuantao Zhao
Summary: Heterostructured duplex stainless steel with high strength and high ductility was prepared through heavy cold rolling and annealing processes. The excellent performance was attributed to the microstructural heterogeneity and the partitioning of plastic strain.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Lei Zhao, Xueyan Qi, Lianyong Xu, Yongdian Han, Hongyang Jing, Kai Song
Summary: The study demonstrates that the grain size of 316H steel significantly affects its tensile behavior, fatigue behavior, and ratcheting fatigue behavior. A decrease in grain size leads to saturation of mobile dislocations, an increase in cyclic stress affecting softening and secondary hardening processes, as well as a reduction in ratcheting strain and an improvement in fatigue life.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Hongzhuang Zhang, Changyou Li, Yanlin Shi, Guo Yao, Yimin Zhang
Summary: This study systematically investigated the microstructural evolution and deformation behavior of LPBF 304L ASS and found that martensitic transformation occurred during fatigue deformation, significantly improving fatigue lifetime.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Gustavo Henrique Pelissari, Diogo Pedrino Braga, Pedro Henrique Fernandes Oliveira, Danielle Cristina Camilo Magalhaes, Maurizio Ferrante, Carlos Alberto Della Rovere, Andrea Madeira Kliauga, Levi de Oliveira Bueno, Vitor Luiz Sordi
Summary: AISI 200LN is a low nickel austenitic stainless steel with excellent mechanical properties at room and cryogenic temperatures, and this study aims to assess its mechanical response under hot tensile and creep tests. By conducting tests and analyzing correlations among various factors, the study provides insights into the creep behavior of AISI 201LN alloy, compared to traditional stainless steels in the 300 series.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Hyung-Jun Cho, Jinheung Park, Yeonggeun Cho, Kyung-Shik Kim, Myoung-Gyu Lee, Sung-Joon Kim
Summary: The effect of pre-strain stress modes on hydrogen embrittlement (HE) in austenitic stainless steel was studied. It was found that tensile pre-strain had negligible effect on HE susceptibility, while cold rolling pre-strain increased it. This difference was attributed to variations in strain distribution, twinning behavior, and H diffusivity between the two deformation methods.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Qingsong Pan, Haofei Zhou, Qiuhong Lu, Huajian Gao, Lei Lu
Article
Nanoscience & Nanotechnology
J. Z. Long, Q. S. Pan, N. R. Tao, L. Lu
SCRIPTA MATERIALIA
(2018)
Article
Materials Science, Multidisciplinary
Jianzhou Long, Qingsong Pan, Nairong Tao, Lei Lu
MATERIALS RESEARCH LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Jianzhou Long, Qingsong Pan, Nairong Tao, Ming Dao, Subra Suresh, Lei Lu
Article
Nanoscience & Nanotechnology
Lijun Jing, Qingsong Pan, Jianzhou Long, Nairong Tao, Lei Lu
SCRIPTA MATERIALIA
(2019)
Article
Materials Science, Multidisciplinary
Li-Jun Jing, Qing-Song Pan, Lei Lu
ADVANCED ENGINEERING MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Qingsong Pan, Haofei Zhou, Qiuhong Lu, Huajian Gao, Lei Lu
Article
Materials Science, Multidisciplinary
Q. S. Pan, J. Z. Long, L. J. Jing, N. R. Tao, L. Lu
Article
Nanoscience & Nanotechnology
Qingsong Pan, Lei Lu
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Multidisciplinary
Lei Lu, Qingsong Pan, Khalid Hattar, Brad L. Boyce
Summary: Metals and alloys with nanoscale structural features exhibit exceptional strength and unusual deformation mechanisms, but can suffer from issues such as suppressed dislocation slip and limited strain hardening. Recent advances have focused on understanding the structural origins of fatigue and fracture resistance in nanostructured materials, and microstructural engineering strategies offer promising paths to develop materials with improved fatigue and fracture properties.
Article
Multidisciplinary Sciences
Qingsong Pan, Liangxue Zhang, Rui Feng, Qiuhong Lu, Ke An, Andrew Chihpin Chuang, Jonathan D. Poplawsky, Peter K. Liaw, Lei Lu
Summary: By introducing gradient nanoscaled dislocation cell structures in stable single-phase HEAs, enhanced strength can be achieved without apparent loss of ductility. The gradient structure induces the formation of high-density tiny stacking faults and twins, contributing to improved plasticity, increased strength, and work hardening.
Article
Chemistry, Multidisciplinary
Qingsong Pan, Song Guo, Fang Cui, Lijun Jing, Lei Lu
Summary: Materials with designed gradient nanograins show exceptional mechanical properties, such as superior strength and ductility. This study demonstrates that a heterostructured 304 stainless steel with solely gradient dislocation structure (GDS) exhibits substantially improved yield strength with slightly reduced uniform elongation compared to its coarse grained counterparts. Microstructural observations reveal that multiple deformation mechanisms, including the formation of dense dislocation patterns, deformation twins and martensitic phase, contribute to the delocalized plastic deformation and superior mechanical performance of the GDS 304 stainless steel.
Article
Materials Science, Multidisciplinary
Qingsong Pan, Lijun Jing, Lei Lu
Summary: How to enhance the high-cycle fatigue resistance of metallic materials under cyclic loading has been a challenging issue. In this study, we introduced nano-scaled low-angle dislocation boundaries in coarse grained pure Cu through a simple drawing process, resulting in a remarkable increase in tensile strength and a fatigue limit of 130 MPa, a record for pure Cu. The enhanced stress resistance to cyclic loading is mainly attributed to the high density of low-angle dislocation cells, which suppress local surface roughening and crack initiation, thereby improving fatigue life.
Article
Metallurgy & Metallurgical Engineering
Pan Qingsong, Cui Fang, Tao Nairong, Lu Lei
Summary: Engineering nano-scale twin boundaries is a novel strategy to achieve superior mechanical properties in metallic materials. However, the fatigue behavior of nanotwin-strengthened metals has been rarely explored. In this study, a bulk heterogeneously structured stainless steel containing nanotwin bundles was prepared and investigated under fatigue tests. The nanotwin-strengthened steel exhibited longer fatigue life and higher cyclic flow stress compared to its coarse-grained counterpart. These improved fatigue properties were attributed to the presence of high-strength nanotwin structure and its co-deformation with surrounding grains.
ACTA METALLURGICA SINICA
(2022)
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)
