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Machine learning-assisted mitigation of interlayer heat accumulation and optimization of forming quality for laser powder bed fusions

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Additive Manufacturing Frontiers 2025年第2期4卷

作者： Gao, Hairui Liu, Yanbing Zhang, Zhenwu Li, Jikang Shen, Juntao Xiang, Honghao Li, Wei Cai, Chao Xia, Weisheng Wei, Qingsong State Key Lab of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology Beijing Institute of Control Engineering Beijing 100190 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China

Interlayer heat accumulation (IHA) is major challenge in the laser powder bed fusion (LPBF) process, as it exacerbates the instability of melt pools, and compromises the quality of the as-built samples. Infrared radiation monitoring is an effective method for exploring IHA. Based on the defined sequence features of interlayer infrared radiation intensity (IIRI), this study established a gated recurrent unit (GRU) neural network model for predicting IIRI in formed samples using machine learning to mitigate the IHA. The model trained on 316 L alloys achieved precise prediction results when transferred to the DZ125 superalloy, effectively managing various emergencies in the LPBF process. The truncated pyramid components were fabricated through parameter optimization based on IIRI prediction results. Compared with the non-optimized components, the CT results demonstrated a significant reduction in internal voids, with the relative density increasing from 91.6 % to 98.5 %. Additionally, surface roughness (Ra) decreased from 32.58 μm to 19.91 μm, while residual stress on the top surface was reduced from 169.21 MPa to 102.37 MPa. © 2025

关键词： Gated recurrent unit (GRU) Infrared radiation Laser powder bed fusion Machine learning Residual stress

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Enhanced Ferroelectric Polarization in Laser-ablated Bi4Ti3O12 Thin Films by Controlling Preferred Orientation

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Journal of Wuhan University of technology(materials Science) 2018年第2期33卷 268-272页

作者：王传彬 LUO Sijun SHEN Qiang HU Mingzhe ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Physics and Electronics Liupanshui Normal University Liupanshui 553004 China

Polycrystalline Bi_4Ti_3O_（12） thin films with various fractions of a-axis, c-axis and random orientations have been grown on Pt（111）/Ti/Si O_2/Si substrates by laser-ablation under different kinetic growth conditions. The relationship between the structure and ferroelectric property of the films was investigated, so as to explore the possibility of enhancing ferroelectric polarization by controlling the preferred orientation. The structural characterization indicated that the large growth rate and high oxygen background pressure were both favorable for the growth of non-c-axis oriented grains in the Bi_4Ti_3O_（12） thin films. The films with high fractions of a-axis and random orientations, i e, f（a-sxis） = 28.3% and f（random） = 69.6%, could be obtained at the deposition temperature of 973 K, oxygen partial pressure of 15 Pa and laser fluence of 4.6 J/cm^2, respectively. It was also noted that the variation of ferroelectric polarization was in accordance with the evolution non-c-axis orientation. A large value of remanent polarization（2 Pr = 35.5 μC/cm^2） was obtained for the Bi_4Ti_3O_（12） thin films with significant non-c-axis orientation, even higher than that of rare-earth-doped Bi_4Ti_3O_（12） films.

关键词： Bi4Ti3O12 thin film preferred orientation ferroelectric polarization laser-ablation

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synthesis of Ti(C, N, O) from TiO2 by CH4-H2-N2 Gas Mixture at Low Temperature

Research Square

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Research Square 2021年

作者： Fan, Gangqiang Hou, Youling Huang, Dejun Dang, Jie Zhang, Run Xiang, Junyi Lv, Xuewei Ding, Xiaoming College of Materials Science and Engineering Chongqing University Chongqing400044 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing University Chongqing400044 China Shanghai200233 China High speed Train Material Research Institute Co. LTD Qingdao266109 China

Titanium carbides, oxides, nitrides and carbonitrides possess many special and excellent properties. But the high production cost caused by the traditional carbothermic reduction process severely limits the wide applications. In this study, a novel synthesis process has been proposed by reducing and carbonitriding TiO2 with CH4-H2-N2 gas mixture at low temperatures. The synthesis of Ti(C, N, O), reaction mechanism and the products composition have been investigated. Thermodynamic analysis indicated that TiO2 could be ultimately reduced and carbonitrided to Ti(C, N, O) by CH4-H2-N2 gas mixture. Based on the predictions of thermodynamics, the effects of reduction time, temperature, and gas composition have been studied experimentally. The obtained results indicated that increasing reduction temperature and introduction of N2 are beneficial to the synthesis of Ti(C, N, O). Finally, the optimum reaction conditions have been obtained. The density functional theory (DFT) results further demonstrated the reaction mechanism. This work provides a new approach to prepare metallic carbonitrides from their oxides. © 2021, CC BY.

关键词： Titanium dioxide

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First-principles study of the Pr-doped bilayer nickelate La3Ni2O7

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Physical Review B 2025年第19期111卷 195118-195118页

作者： Zihao Huo Peng Zhang Haoliang Shi Xiaochun Yan Defang Duan Tian Cui Key Laboratory of Material Simulation Methods and Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University Xi'an 710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo 315211 China

Recently, the Pr-doped Ruddlesden-Popper (RP) phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and a superconducting volume fraction of about 57% at high pressure. However, the effect of Pr doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and the high-pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may reduce the required pressure for the superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide a helpful guide for understanding the effect of chemical pressure in an isovalent-doped RP phase nickelate superconductor.

关键词： Crystal atomic structure

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Coarsening behavior of（Ni,Co）2Si particles in Cu-Ni-Co-Si alloy during aging treatment

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Rare Metals 2019年第11期38卷 1062-1069页

作者： Xiang-Peng Xiao Hai Xu Jin-Shui Chen Jun-Feng Wang Jiao Lu Jiao-Bo Zhang Li-Jun Peng Institute of Engineering Research Jiangxi University of Science and TechnologyGanzhou 341000China School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous MetalsBeijing 100088China

The coarsening behavior of(Ni,Co)2Si particles in Cu-Ni-Co-Si alloy was investigated by experimental observations and coarsening kinetics calculations when aged at 450,500,550 and 600℃ for different *** results show that the critical particle radius for coherence mismatch is found to be 10.3 nm,and particles larger than 25 nm are generally *** relationship of(Ni,Co)2Si particles size and aging time follows Lifshitz,Slyosov and Wagner(LSW) *** particle size distributions fit well to the LSW theoretical *** activation energy for(Ni,Co)2Si coarsening is accurately determined to be(216.21 ± 5.18)kJ mol-1 when considering the effect of temperature on the solution concentrations in *** coarsening of(Ni,Co)2Si particles in Cu-Ni-Co-Si alloy is controlled by diffusion of Ni,Co and Si in Cu *** growth of particles for long durations suggests that vacancies can be trapped within the structure for long time despite their mobility.

关键词： Coarsening behavior (Ni,Co)2Si particles Coherence mismatch LSW theory Particle size distributions

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Constructing entwined TiN@CNT hybrid network via hydrogen bonding self-assembly towards photothermal and durable superhydrophobic anti-/de-icing

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Chemical Engineering Journal 2025年 518卷

作者： Lingtong Li Zhiheng Zhao Xiaoying Ji Dong Han Hong Wu Dongliang Li Shaoyun Guo State Key Laboratory of Advanced Polymer Materials Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu 610065 China China Tobacco Sichuan Industrial Co. Ltd. Chengdu 610066 China Dongfang Electric Wind Power Co. Ltd. Deyang 618000 China

Photothermal superhydrophobic surfaces are potentially ideal for anti-/de-icing, due to the fast water removal, delayed icing and photothermal deicing properties. However, the tedious fabrication procedures and inadequate durability limit their practical applications. Here, entwined TiN@CNT hybrid network is successfully constructed via hydrogen bonding self-assembly, and further modified with tetraethyl orthosilicate (TEOS) and hexadecyltrimethoxysilane (HDTMS) to achieve a both photothermal and durable superhydrophobic surface for anti-/de-icing application. By tuning the nanoparticle ratio, the hybrid network not only realizes full-spectrum high absorption, but also achieves photothermal synergy through non-radiative relaxation and thermal vibrations. Besides incorporating polydimethylsiloxane (PDMS) with the hybrid network as the photothermal superhydrophobic surface, the adhesion of the surface to the substrate is further enhanced by fabricating PDMS with modified silicone resin (MSR) as a bonding layer. After various robustness tests, the surface maintained excellent consistency. As a result, the surface exhibits outstanding anti−/de-icing performance with stable icing delay time (e.g. 299–384 s, 0–75 mW/cm 2 ) and rapidly photothermal deicing capabilities (e.g. 198–266 s, 50–100 mW/cm 2 ) under low temperature. Moreover, the simulated wind turbine blades and cottages show promising anti−/de-icing properties on the photothermal superhydrophobic coating surface in extreme environments. This work offers an insight into design of novel materials with stable anti-/de-icing coating surfaces, which would be extended into some applied realms in cold or low-temperature climate.

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Modeling and simulation of two port proportional slip-in cartridge valve based on AMESim 2

Modeling and simulation of two port proportional slip-in car...

引用

2nd International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2019

作者： Wang, Wenzhu Wu, Rendong Yuan, Chaolong Chang, Baohua Du, Dong Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China

Two port proportional slip-in cartridge valves are critical components of the heavy duty press hydraulic system. Their performance, especially the static flow rate under different valve opening size and the valve response time, is important to the press velocity control precision. So, it is necessary to build an accurate model of the valve to analyse different parameters' influences on the valve performance. Based on the analysis of the valve structure and working principle, the valve model is established by the AMESim. The valve flow rate under different valve opening size ratio is calculated using the simulation model. The rated flow rate calculated by the simulation model is 0.33% less than the sample value, and the variation trend of the calculated flow rate curve is consistent with the manual curve. This demonstrates the considerable effectiveness of the valve simulation model. Then, the influences of the spring stiffness, the pilot oil pressure and the pilot valve gain on the valve poppet response time are analysed using the simulation model, respectively. This research may offer the basis for the whole hydraulic system building and control strategy designing. © 2019 IOP Publishing Ltd.

关键词： Flow rate

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Editor's note to“A review of efficient electrocatalysts for the oxygen evolution reaction at large current density”[DeCarbon 5(2024)100062]

DeCarbon

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DeCarbon 2024年第4期6卷 66-66页

作者： Youtao Yao Jiahui Lyu Xingchuan Li Cheng Chen Francis Verpoort John Wang Zhenghui Pan Zongkui Kou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070PR China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000PR China Hubei Key Laboratory of Fuel Cell Wuhan University of TechnologyWuhan430070PR China Department of Materials Science and Engineering National University of Singapore117574SingaporeSingapore Institute of Materials Research and Engineering(IMRE) A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis WaySingapore138634Singapore National University of Singapore(Chongqing)Research Institute Chongqing401123PR China School of Materials Science and Engineering Tongji UniversityShanghai201804PR China

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Review on the 3-D simulation for weft knitted fabric

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Journal of Engineered Fibers and Fabrics 2021年第16期16卷

作者： Sha, Sha Geng, Anqi Gao, Yuqin Li, Bin Jiang, Xuewei Tao, Hui Luo, Lei Yuan, Xiaohong Ke, Huizhen Hu, Xinrong Deng, Zhongmin Chen, Zhi State Key Laboratory of New Textile Materials and Advanced Processing Technologies Key Laboratory of Textile Fiber Product Ministry of Education Wuhan Textile University WuhanHubei China Wuhan Textile and Apparel Digital Engineering Technology Research Center School of Fashion Wuhan Textile University WuhanHubei China Engineering Research Center of Hubei Province for Clothing Information Wuhan Textile University WuhanHubei China Fujian Key Laboratory of Novel Functional Textile Fibers and Materials Engineering Research Center of Textile and Clothing Fujian Province University Minjiang University Fuzhou China

There are different kinds of geometrical models and physical models used to simulate weft knitted fabrics nowadays, such as loop models based on Pierce, piecewise function, spline curve, mass-spring model, and finite element analyses (FEA). Weft knitting simulation technology, including modeling and yarn reality, has been widely adopted in fabric structure designing for the manufacturer. The technology has great potentials in both industries and dynamic virtual display. The present article is aimed to review the current development of 3-D simulation technique for weft knitted fabrics. © The Author(s) 2021.

关键词： Knit fabrics

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Quantitative study on the interfacial performance of micron-fiber cord/elastomer

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Composites Part B: Engineering 2025年 303卷

作者： Wang, Chaojun Zhao, Zihao Liu, Fengli Huang, Wei Tian, Chenchen Yu, Bing Ning, Nanying Tian, Ming State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Key Laboratory of Carbon Fiber and Functional Polymers Ministry of Education Beijing University of Chemical Technology Beijing100029 China Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing100029 China Zhongce Rubber Group Co. Ltd Hangzhou310018 China

Fiber-reinforced rubber composites (FRRC) are extensively utilized owing to their superior performances, which stems from the efficient load transfer between the rubber matrix and reinforcing fibers through complex interfacial stress transfer mechanisms. In 1952, Cox's interfacial stress transfer model underscored the critical roles of interfacial thickness and modulus in determining interfacial debonding stress. Although the model remains foundational in understanding stress transfer mechanisms in FRRC, its application has been limited by the challenges in quantitatively measuring these interfacial parameters. This study addresses this gap by developing a polishing technique that integrates mechanical and ion beam polishing, specifically tailored for FRRC. By optimizing key parameters, including rubber thickness on fiber surface, ion beam polishing voltage and temperature, and fiber monofilament density, ultra-flat surfaces on micron-fiber cord/elastomer composites have been achieved. This enabled the successful visualization of the intricate tri-phase, two-interface structure using the quantitative nanomechanical mapping technique of atomic force microscopy (AFM-QNM). The interfacial thickness and modulus were then quantitatively characterized using AFM-QNM and nanoindentation techniques. Thus, the interfacial shear strength and debonding stress were successfully calculated using the KT and COX models. Using RFL-treated nylon 66 fiber/rubber composites as a case study, based on the quantitative characterization of interfacial thickness and modulus, the interfacial shear strength and interfacial debonding stress were quantified as 5.63 MPa and 112.14 MPa, respectively. By using such a method, a critical link between fiber surface treatment, interfacial performance, and macroscopic adhesion properties can be established, thereby facilitating the design and performance optimization of FRRC materials. © 2025

关键词： Shear strength

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