Article
Materials Science, Multidisciplinary
Y. M. Ren, X. Lin, H. O. Yang, H. Tan, J. Chen, Z. Y. Jian, J. Q. Li, W. D. Huang
Summary: The microstructural features of a Ti-6Al-4 V alloy manufactured via high power laser directed energy deposition subjected to low-cycle fatigue loading were studied, revealing that fatigue microcracks typically initiated at the surface of the fatigue specimens and various dislocation substructure features were observed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Sapam Ningthemba Singh, Ashish B. Deoghare
Summary: Fatigue failure is a major cause of part failure in laser directed energy deposition (LDED). Increasing the layer thickness in LDED can greatly reduce manufacturing time. This study focused on the microstructure, fatigue behavior, and fractography of Ti6Al4V alloy samples fabricated using high-layer thickness LDED. The results showed that proper material deposition and minimized surface cracks were achieved. Fatigue life initially increased by 61.4% from specimens 1 to 2, but decreased by 15.6% from specimens 2 to 3 and 25.7% from specimens 3 to 4. Fractography revealed ductile fatigue failure with clear crack initiation and propagation. The performance of the current high-layer thickness LDED process was comparable to previous literature.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Renka Li, Bei He
Summary: In this study, a TA15 alloy with dual deposition direction was prepared using laser directed energy deposition technology. The deposition direction was changed by 45 degrees, which resulted in the appearance of a large amount of grain boundary alpha phase (alpha(GB)) at the interface. Tensile test showed that the interface bonding was reliable, but fracture occurred in the region experiencing strong plastic deformation, indicating that alpha texture was the main factor causing fracture.
Article
Nanoscience & Nanotechnology
Hang Lv, Zhenlin Zhang, Yarong Chen, Yan Liu, Hui Chen, Yong Chen, Jing Cheng, Jian She, Huabing He, Jintao Chen
Summary: In this study, several large Ti-6Al-4V blocks were fabricated successfully using high-power laser metal deposition (HP-LMD). The high cycle fatigue (HCF) property and fatigue crack growth (FCG) behavior of the as-built Ti-6Al-4V alloy were investigated in horizontal and vertical directions. The results showed that the HCF performance of the vertical specimens was superior to the horizontal specimens, but inferior to the wrought Ti-6Al-4V. Additionally, the fatigue crack growth rate of the vertical specimens was lower than that of the horizontal specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Green & Sustainable Science & Technology
J. Joju, D. Verdi, W. S. Han, L. Y. Hang, N. Soh, C. C. Hampo, N. Liu, S. S. Yang
Summary: This study conducted a sustainability assessment on the reuse of un-melted feedstock powder in Directed Laser Deposition. The results showed that the un-melted powder experienced minimal changes and the Life Cycle Assessment demonstrated significant environmental benefits from reusing the powder. Reusing the powder resulted in a 15%-25% reduction in environmental impact compared to using only virgin material.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Mechanical
Litton Bhandari, Vidit Gaur
Summary: This study investigates the cyclic behavior and cold dwell sensitivity of additively manufactured Ti6Al4V alloy. Low cycle fatigue tests were conducted on specimens exposed to a dwell period, revealing a significant reduction in fatigue lives at lower strain amplitudes but similar lives at higher ones. Fractographic analysis identified multiple crack initiation regions, attributed to process-induced defects or facet formation in α laths. The study discusses the failure mechanism based on stress redistribution and relaxation.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Manufacturing
Wenlu Zhou, Chen Shen, Xueming Hua, Lin Wang, Yuelong Zhang, Fang Li, Jianwen Xin, Yuhan Ding
Summary: In recent years, there has been increasing interest in additive manufacturing of titanium aluminide. Element additions have been a concern in order to improve the microstructure and mechanical properties of additively manufactured titanium aluminide. This study successfully introduced vanadium into gamma-TiAl alloy using the twin-wire directed energy deposition-arc (TW-DED-arc) method, aiming to enhance the strength and plasticity of the deposited TiAl component. The research investigated the microstructure, chemical composition homogeneity, and mechanical properties of TW-DED-arc deposited Ti-48Al and Ti-48Al-2V alloys, and found that vanadium additions improved the properties of the alloy.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Yongming Ren, Xin Lin, Zengyun Jian, Haoran Peng, Weidong Huang
Summary: The study investigated the fatigue crack growth behavior of Ti-6Al-4V alloy fabricated by high-power laser directed energy deposition, revealing parts under heat treated conditions exhibit superior FCG resistance. The research also calculated the plastic zone sizes ahead of the crack tip and proposed a method to determine the typical microstructural characteristic of additive manufactured Ti-6Al-4V parts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Jiangjing Xi, Yun Hu, Hui Xing, Yuanfei Han, Haiying Zhang, Jun Jiang, Kamran Nikbin
Summary: This study investigates the effects of post-process methods on fatigue properties of SLM-fabricated specimens and proposes key factors influencing low-cycle fatigue (LCF) properties. Tensile test results showed similar strength among specimens with different post-process treatment, while LCF test revealed no significant difference between standard heat treatment (HT) and hot isostatic pressing (HIP) specimens. Additionally, a microstructure-based multistage fatigue model was employed to predict LCF life with good agreement with experimental results.
Article
Engineering, Manufacturing
Shiming Gao, Fei Weng, Ojo Philip Bodunde, Mian Qin, Wei-Hsin Liao, Ping Guo
Summary: Additive manufacturing is used to process nickel-titanium shape memory alloys due to flexibility and minimal defects. A continuous directed energy deposition method has been proposed to improve microstructure uniformity, resulting in fabricated specimens with monotonic temperature histories, relatively uniform phase distribution and microstructure morphology, as well as high compressive strength and strain.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Nanoscience & Nanotechnology
Aitang Xue, Xin Lin, Lilin Wang, Xufei Lu, Hanlin Ding, Weidong Huang
Summary: The coarsening of equiaxed beta-grains in titanium alloy produced by additive manufacturing under high-temperature thermal cycling was reported. A modified model was proposed to predict the coarsened beta-grain size, providing guidance for the composition design of titanium alloy with fine equiaxed beta-grains.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Wenlu Zhou, Chen Shen, Xueming Hua, Yuelong Zhang, Lin Wang, Jianwen Xin, Fang Li
Summary: Due to its low density and good high temperature performance, titanium aluminide has attracted attention in the aerospace and automotive industries. In recent years, additive manufacturing of titanium aluminide has become popular. This study successfully fabricated commercial graded TiAl-4822 alloy using an innovative TW-DED-arc process, resulting in good mechanical properties and uniform chemical composition.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Q. Zhou, X. Z. Zhang, T. Song, S. L. Lu, T. Dong, H. P. Tang, M. Qian
Summary: In this study, the fabrication of Ti-1Al-8V-5Fe (Ti-185) alloy using laser directed energy deposition (L-DED) was investigated. The precipitate phases along the build height were found to have a significant influence on the tensile properties of the alloy. The formation of the embrittling isothermal omega-phase (omega iso) was found to result in zero plasticity in the top region of the sample, while the middle region without the omega-phase exhibited significant tensile ductility and strength. Furthermore, it was demonstrated that converting the isothermal omega-phase to the athermal omega-phase (omega ath) restored the tensile ductility of the alloy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaobin Yu, Xin Lin, Zihong Wang, Shuya Zhang, Xuehao Gao, Yufeng Zhang, Yongming Ren, Weidong Huang
Summary: The study showed that the high-cycle fatigue properties of Inconel 718 (IN718) superalloy prepared using laser directed energy deposition (LDED) and subjected to a specified heat treatment scheme exhibit significant differences at room temperature and high temperatures. The fatigue limit is higher at room temperature and lower at higher temperatures, with fatigue limits only about 77% and 63% of the values observed in wrought alloys, respectively. Furthermore, the fatigue failure mode of HSA IN718 alloy changes with increasing test temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Coatings & Films
L. M. Kang, S. Q. Xu, Y. K. Bai, Y. F. Qiu, X. Pang, J. M. Zheng, X. C. Luo, H. L. Liu, B. C. Xian, C. Yang
Summary: With the development of science and technology and the popularization of intelligent manufacturing, laser additive manufacturing of titanium alloys is being considered in industrial adoption due to its advantages. However, large scale columnar crystals formed in the as-prepared alloy result in anisotropic macroscopic properties. In this study, a dual laser processing technique integrating laser melting deposition and laser shock peening was proposed to achieve isotropic microstructure in Ti-6Al-4V alloy, providing insight into fabricating isotropic metal components with higher performance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
J. Li, Y. Li, J. Hou, H. Xie
Summary: This study addresses the problem of complex residual deformation during the repair of components using DED, proposing a new phase-shifting technique, PTM, and utilizing a CGS system for analysis. Experimental results show that RD magnitude is larger in the scanning direction than in the deposition direction, with PTM effectively evaluating the influence of scanning paths on RD.
EXPERIMENTAL MECHANICS
(2022)
Article
Engineering, Chemical
Jiaqiang Li, Zetian Si, Dong Han, Zhifang Hang
Summary: In this investigation, a mechanical vapor recompression system coupled with steam accumulator (MVR-SA) was proposed to reduce start-up time and increase energy efficiency in batch evaporation process. Mathematical models and experimental results showed the effectiveness of the MVR-SA system. Simulation analysis identified factors affecting system performance, and an economic comparison confirmed the superiority of the MVR-SA system.
Article
Electrochemistry
Jiaqiang Li, Qilong Han, Yibo Zou, Zexin Yu, Gangxian Zhu, Wei Xu, Shihong Shi
Summary: The corrosion behavior and transpassive dissolution properties of TC4 alloy produced by additive manufacturing technology were investigated in different NaCl concentrations. The corrosion resistance exhibited non-linear characteristics and the passive film on the surface decreased with increasing NaCl concentrations.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Article
Engineering, Industrial
Jiaqiang Li, Xin Lin, Hua Tan, Gangxian Zhu, Yayun Liu, K. C. Chan, Shihong Shi
Summary: We studied the electrochemical dissolution behavior of titanium alloys prepared by different processing methods and found that the forged alloy showed slightly better corrosion resistance, which is mainly attributed to the galvanic effect of fine phase particles.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jiaqiang Li, Yuan Yang, Gangxian Zhu, Chengfeng Sun, Yiyang Chen, Kejun Wang, Shihong Shi
Summary: The hybrid manufacturing method of laser cladding deposition (LCD) additive manufacturing and electrochemical machining (ECM) shows great potential in advanced manufacturing technology for difficult machined materials. The anisotropic electrochemical performance and machinability of LCD-produced Ti6Al4V alloy were studied, and differences were observed between the horizontal and vertical planes due to microstructural characteristics.
Article
Optics
Yibo Zou, JiaQiang Li, Yusheng Ju
Summary: This paper proposes two innovative data fusion methods for reconstructing surfaces produced by directed energy deposition additive manufacturing. These methods provide solutions for microscopic surface reconstruction and representation in multiscales.
Article
Engineering, Manufacturing
Guohao Zhang, Xufei Lu, Jiaqiang Li, Jing Chen, Xin Lin, Meng Wang, Hua Tan, Weidong Huang
Summary: A novel depositing strategy is designed to preserve equiaxed grains and interrupt the epitaxial growth of columnar grains in metal additive manufacturing, resulting in a superior microstructure and reduced anisotropy.
ADDITIVE MANUFACTURING
(2022)
Article
Automation & Control Systems
Yibo Zou, Shui Cao, Jiaqiang Li, Yusheng Ju
Summary: This paper proposes multiscale characterization methods for additive manufactured surfaces using 3D topographic data at different resolutions. The methods involve point pattern analysis, roughness characterization, and feature-based characterization. The results demonstrate the different contributions of weld track features and particle features to surface roughness at different scales.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Shuoqing Shi, Xin Lin, Lilin Wang, Zhennan Wang, Lei Wei, Haiou Yang, Yao Tang, Weidong Huang
Summary: The microstructure formation mechanism of an AlSi10Mg alloy prepared by laser directed energy deposition (DED-LB) and its influence on the mechanical properties were thoroughly investigated. The relationships between the microstructure characteristic scale, solidification/thermal cycle conditions, and tensile mechanical properties were established. The research findings provide a method for the precision control and large-scale application of DED-AlSi10Mg alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Correction
Materials Science, Multidisciplinary
Yuwei Zhao, Jiaqiang Li, Gangxian Zhu, Shihong Shi, Geyan Fu
JOURNAL OF LASER APPLICATIONS
(2023)
Article
Optics
Yayun Liu, Qi Zhu, Chuanyang Wang, Jiaqiang Li
Summary: This paper investigates the fabrication of biomimetic textures on CoCrMo artificial knee joints and their impact on friction performance. The results show that the textured joints exhibit better friction properties compared to non-textured joints, and samples with a scaly textured structure show the best friction performances. The mechanisms responsible for this enhancement are explained as micro-textures storing wear debris and lubricating fluid, as well as derivative-cutting behavior removing wear debris.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Yinghui Zhou, Zhennan Wang, Xin Lin, Zengyun Jian, Yongqin Liu, Yongming Ren, Tianchi Zhang, Wenting Shao, Xigang Yang
Summary: Samples with diverse micro-structures were prepared by adjusting the forming parameters, and the impact fracture behavior of these samples was studied. The key determinant of the impact toughness was the block-shaped brittle theta phase that precipitated along the grain boundaries and pore defects.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Yan Chen, Yongming Ren, Kan Li, Bo Dang, Zengyun Jian
Summary: The study investigates the microstructural features, mechanical properties, and porosity of laser powder bed fusion (LPBF)-fabricated Al matrix composites reinforced with SiC particles. The results show that the LPBF-deposited composites mainly exhibit laser track segments in macroscale and fine cellular-like dendrite grains and (Al + Si) eutectic phases within the melt pool on a microscale. The study also analyzes the influence of oxidation temperatures on the SiC particle features and the stress and strain distribution in the deposited composites.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Li Guangming, Zhu Gangxian, Li Jiaqiang, Shi Shihong
Summary: The forming rules of laser additive manufacturing thin-walled parts on a nonhorizontal substrate were investigated, and it was found that the total width and height of the parts increase while the length of the molten pool decreases with the increase of substrate inclination angle. The tail collapse of the forming part becomes more severe with the increasing substrate inclination angle. The study findings provide valuable references for laser additive manufacturing and repair on nonhorizontal substrates.
LASER & OPTOELECTRONICS PROGRESS
(2023)
Article
Engineering, Chemical
Jiaqiang Li, Zetian Si, Yuan Yang
Summary: This paper focused on employing a vacuum membrane distillation system driven by mechanical vapor recompression to achieve sulfuric acid waste recovery. The effects of critical parameters on the mass and heat transfer processes were investigated, and the effects of membrane area on the thermodynamic characteristic of the system were explored. The research results provide reference and technical support for the treatment of industrial waste acid.
DESALINATION AND WATER TREATMENT
(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)
