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Erratum to ‘‘Modeling and Experimental Validation of the Electron Beam Selective MeltingProcess” [Engineering 3 (2017) 701–707] Erratum

Wentao Yan, Ya Qian, Weixin Ma, Bin Zhou, Yongxing Shen, Feng Lin

《工程（英文）》 2018年 第4卷 第1期   页码 164-164 doi: 10.1016/j.eng.2017.12.012

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用于介观模拟电子束选区熔化的数据挖掘技术 Article

钱亚, 闫文韬, 林峰

《工程（英文）》 2019年 第5卷 第4期   页码 746-754 doi: 10.1016/j.eng.2019.06.006

摘要：

 在电子束选区熔化技术（EBSM）工艺中，制造部件的性质受到每一道熔道沉积质量的影响。然而，熔道的形成受到各种物理现象和工艺参数的支配，这些参数之间的相关性十分复杂，难以通过实验得出。近来，介观建模技术已成为模拟电子束（EB）熔化过程以及揭示特定熔道形貌的形成机制的手段。尽管如此，人们对工艺参数与熔道特征之间的相关性尚未有定量的理解。本文从介观模拟的结果出发，研究了熔道的形态特征，同时引入了熔道宽度和高度等关键性描述指标，以便从数值上评估沉积质量。本文还定量研究了各种工艺参数的影响，从而导出了工艺条件和熔道特征之间的相关性。最后，本文提出了一种由介观建模和数据挖掘技术组成的仿真驱动优化框架，并讨论了框架的潜力和局限性。

关键词： 电子束选区熔化     介观模型     数据挖掘    

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电子束选区熔化过程的建模研究及实验验证

闫文韬, 钱亚, 马维馨, 周斌, 沈泳星, 林峰

《工程（英文）》 2017年 第3卷 第5期   页码 701-707 doi: 10.1016/J.ENG.2017.05.021

摘要：
电子束选区熔化技术（EBSM）是一种很有潜力的增材制造（AM）技术。EBSM 由三个主要步骤组成：铺设粉层、预热至粉末略烧结和选区熔化粉末床。这些步骤中涉及高度瞬态多物理场现象，给原位实验的观察和测量带来了重大挑战。利用了高保真模型和后处理实验，来增强对各个步骤中物理机制的理解。模型模拟了实际制造过程，包括：使用离散元法（DEM）的铺粉模型、粉末烧结（固态烧结）的相场（PF）模型和使用有限体积法（FVM）的粉末熔化（液态烧结）模型。本文对所有主要步骤进行了全面的分析，这些分析很少有人报道过。初步模拟结果（包括粉末颗粒在粉末床内的堆积、颗粒之间烧结颈的形成和单道成形缺陷）与实验结果基本一致，表明该模型可以诠释所述机制，并能够指导实验设置和制造过程的设计和优化。

关键词： 建模     电子束     增材制造     粉末尺度    

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双金属电子束选区熔化的硬件开发与成形实验 Article

郭超, 葛文君, 林峰

《工程（英文）》 2015年 第1卷 第1期   页码 124-130 doi: 10.15302/J-ENG-2015013

摘要：

电子束选区熔化（EBSM）是一种利用电子束扫描、熔化金属粉末逐层制造三维实体零件的增材制造技术。近年来，EBSM已经成功应用于多种材料的增材制造。现有EBSM工艺方面的研究主要聚焦于单种材料的成形，本研究提出一种能够利用两种粉末材料成形梯度结构的EBSM工艺，提出基于振动的粉末供给方法，并实现了两种粉末材料独立供给并混合。利用Ti6Al4V和Ti47Al2Cr2Nb两种材料进行成形。Ti6Al4V在室温下有很好的强度与塑性，而Ti47Al2Cr2Nb在高温下性能优良，但有很大的室温脆性。本研究提出的双金属EBSM工艺成功制备了Ti6Al4V/Ti47Al2Cr2Nb梯度结构，并利用光学显微镜、扫描电子显微镜、电子微探针分析等方法研究了该梯度结构的微观组织和化学成分。结果显示，梯度结构的截面厚度约为300 μm，没有裂纹，化学成分在界面处呈阶梯式变化。

关键词： 增材制造     电子束     选区熔化     梯度材料     钛合金     钛铝合金    

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Fabrication and in vivo evaluation of Ti6Al4V implants with controlled porous structure and complex shape

Xiang LI, Yun LUO, Chengtao WANG, Wenguang ZHANG, Yuanchao LI

《机械工程前沿（英文）》 2012年 第7卷 第1期   页码 66-71 doi: 10.1007/s11465-012-0302-y

摘要：

Electron beam melting process was used to fabricate porous Ti6Al4V implants. The porous structure and surface topography of the implants were characterized by scanning electron microscopy (SEM) and digital microscopy (DM). The results showed that the pore size was around 600 and the porosity approximated to 57%. There was about±50 μm of undulation on implants surfaces. Standard implants and a custom implant coupled with porous sections were designed and fabricated to validate the versatility of the electron beam melting (EBM) technique. After coated with bone-like apatite, samples with fully porous structures were implanted into cranial defects in rabbits to investigate the in vivo performance. The animals were sacrificed at 8 and 12 weeks after implantation. Bone ingrowth into porous structure was examined by histological analysis. The histological sections indicated that a large amount of new bone formation was observed in porous structure. The newly formed bone grew from the calvarial margins toward the center of the bone defect and was in close contact with implant surfaces. The results of the study showed that the EBM produced Ti6Al4V implants with well-controlled porous structure, rough surface topography and bone-like apatite layer are beneficial for bone ingrowth and apposition.

关键词： electron beam melting process     implant     porous structure     bone ingrowth    

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disrupting chemicals from water through urethane functionalization of microfiltration membranes via electronbeam irradiation

《环境科学与工程前沿（英文）》 2023年 第18卷 第4期 doi: 10.1007/s11783-024-1805-6

摘要：

● Urethane functionalities created on PES membranes via electron beam irradiation.

关键词： Surface functionalization     Electron beam irradiation     Microfiltration     Endocrine disrupting chemicals    

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Effects on mechanical properties in electron beam welding of TC4 alloy by laser shock processing

LU Jinzhong, ZHANG Yongkang, KONG Dejun, REN Xudong, GE Tao, ZOU Shikun

《机械工程前沿（英文）》 2007年 第2卷 第4期   页码 478-482 doi: 10.1007/s11465-007-0083-x

摘要： The surface of TC4 titanium alloy welding line by electron beam welding (EBW) was processed by high power Q-switched and repetition-rate Nd: glass laser. Effects of laser power and spot diameter on residual stress and micro-hardness of the TC4 alloy welding line by laser shock processing (LSP) have been analyzed. Results show that residual stresses almost do not change as laser power is 45.9 J, spot diameter is φ9 mm; While laser power is 45.9 J, spot diameter less than φ3 mm, the distribution of residual stress in welding line occurs obvious variation, which residual stress increase obviously with spot diameter decrease. When power density is bigger than 1.8×10 W/cm, residual stresses of electron beam welding line occur change by LSP, which improve obviously residual stress distribution; while laser power is bigger than 1.2×10 W/cm, the surface micro-hardness of electron beam welding line occurs change by LSP, which improve obviously micro-hardness distribution. Mechanical properties of TC4 titanium alloy welding line will be improved by LSP, which provides experimental foundation for further controlling the distributions of residual stress and micro-hardness during laser shock processing.
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Simultaneous Feammox and anammox process facilitated by activated carbon as an electron shuttle for autotrophic

《环境科学与工程前沿（英文）》 2022年 第16卷 第7期 doi: 10.1007/s11783-021-1498-z

摘要：

• The autotrophic nitrogen removal combining Feammox and Anammox was achieved.

关键词： Feammox     Anammox     Extracellular electron transfer     Electron shuttle     Activated carbon    

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Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

《环境科学与工程前沿（英文）》 2015年 第9卷 第4期   页码 583-590 doi: 10.1007/s11783-014-0691-8

摘要： The reactions between chlorinated benzenes (CBzs) and hydrated electron ( ) were investigated by the electron beam (EB) and laser flash photolysis (LFP) experiments. Under the EB irradiation, the effects of irradiation dose, initial concentration and the number of Cl atoms on the removal efficiencies were further examined. At 10 kGy, the removal efficiencies of mono-CB, 1,3-diCB, 1,2-diCB and 1,4-diCB were 41.2%, 87.2%, 84.0%, and 84.1%, respectively. While irradiation dose was 50 kGy, the removal efficiencies increased to 47.4%, 95.8%, 95.0%, and 95.2%, respectively. Irradiation of CBzs solutions has shown that the higher the initial concentration, the lower the percentage of CBzs removal. In addition to this, the dechlorination efficiencies of 1,2-dichlorobenzene (1,2-diCB), 1,3-dichlorobenzene (1,3-diCB) and 1,4-dichlorobenzene (1,4-diCB) were much higher than that of chlorobenzene (mono-CB). The kinetics of the reactions was achieved with nanosecond LFP. The rate constants of second-order reaction between with mono-CB, 1,2-diCB, 1,3-diCB and 1,4-diCB were (5.3±0.4) × 10 , (4.76±0.1) × 10 , (1.01±0.1) × 10 and (3.29±0.2) × 10 L·mol ·s , respectively. Density functional theory (DFT) calculations were performed to determine the optical properties of unstable CBzs anion radicals, and the main absorption peaks lied in the range of 300–550 nm. The primary reaction pathway of CBzs with was gradual dechlorination, and the major products were Cl and benzene (CBzs(-Cl )). Furthermore, biphenyl (or chlorobiphenyl) was observed during the LFP, which was probably formed by recombination of benzene radicals.

关键词： chlorinated benzenes     hydrated electron     electron beam     laser flash photolysis    

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纳米测量仪器和纳米加工技术

姚骏恩

《中国工程科学》 2003年 第5卷 第1期   页码 33-37

摘要：

纳米科技是当今国际上的一个热点。文章对纳米科技作了简要介绍, 纳米测量和加工是纳米科技中的一个不可缺少的重要组成部分。叙述了发展纳米测量和纳米加工技术的两个主要途径：一是发展传统技术，主要是电子显微术以及最近发展起来的聚焦离子束（FIB）- 电子束数控加工中心；二是创造新的测量仪器，建立新原理和新方法，介绍了国内外电子显微镜和扫描探针显微镜这两类纳米测量分析仪器的发展、应用和生产现状。指出我国电子显微仪器和扫描探针显微镜的开发和生产面临困境，应尽快建立和加强自己的电子显微仪器和扫描探针显微镜等纳米测量和纳米加工设备制造产业，并列入国家科技发展规划。

关键词： 纳米科技     纳米测量     电子显微镜     扫描探针显微镜     聚焦离子束-电子束装置     仪器生产    

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激光相变热处理对TC４电子束焊缝残余应力的影响

鲁金忠,张永康,孔德军,任旭东,邹世坤,王西昌

《中国工程科学》 2007年 第9卷 第5期   页码 72-76

摘要：

利用CO2激光相变热处理技术对TC4钛合金电子束焊缝进行了处理，研究了激光功率、光斑直径、辅助气体等激光工艺参数对电子束焊缝残余应力分布的影响。实验结果表明，激光相变热处理改善了焊缝残余应力的分布，使焊缝表面残余应力由拉应力转变为压应力，其压应力值随着激光功率的增加而增大，随着激光光斑直径的减小而增加；辅助气体为O2时残余压应力值比辅助气体为N2大30～40MPa，激光相变热处理显著提高了TC4钛合金电子束焊缝的残余压应力及其使用寿命。

关键词： 激光相变热处理     TC4钛合金     电子束焊缝     残余应力    

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Build orientation determination of multi-feature mechanical parts in selective laser melting via multi-objective

《机械工程前沿（英文）》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0737-8

摘要： Selective laser melting (SLM) is a unique additive manufacturing (AM) category that can be used to manufacture mechanical parts. It has been widely used in aerospace and automotive using metal or alloy powder. The build orientation is crucial in AM because it affects the as-built part, including its part accuracy, surface roughness, support structure, and build time and cost. A mechanical part is usually composed of multiple surface features. The surface features carry the production and design knowledge, which can be utilized in SLM fabrication. This study proposes a method to determine the build orientation of multi-feature mechanical parts (MFMPs) in SLM. First, the surface features of an MFMP are recognized and grouped for formulating the particular optimization objectives. Second, the estimation models of involved optimization objectives are established, and a set of alternative build orientations (ABOs) is further obtained by many-objective optimization. Lastly, a multi-objective decision making method integrated by the technique for order of preference by similarity to the ideal solution and cosine similarity measure is presented to select an optimal build orientation from those ABOs. The weights of the feature groups and considered objectives are achieved by a fuzzy analytical hierarchy process. Two case studies are reported to validate the proposed method with numerical results, and the effectiveness comparison is presented. Physical manufacturing is conducted to prove the performance of the proposed method. The measured average sampling surface roughness of the most crucial feature of the bracket in the original orientation and the orientations obtained by the weighted sum model and the proposed method are 15.82, 10.84, and 10.62 μm, respectively. The numerical and physical validation results demonstrate that the proposed method is desirable to determine the build orientations of MFMPs with competitive results in SLM.

关键词： selective laser melting (SLM)     build orientation determination     multi-feature mechanical part (MFMP)     fuzzy analytical hierarchy process     multi-objective decision making (MODM)    

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Room temperature liquid metal: its melting point, dominating mechanism and applications

Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU

《能源前沿（英文）》 2020年 第14卷 第1期   页码 81-104 doi: 10.1007/s11708-019-0653-8

摘要： The room temperature liquid metal (LM) is recently emerging as a new class of versatile materials with fascinating characteristics mostly originated from its simultaneous metallic and liquid natures. The melting point is a typical parameter to describe the peculiarity of LM, and a pivotal factor to consider concerning its practical applications such as phase change materials (PCMs) and advanced thermal management. Therefore, the theoretical exploration into the melting point of LM is an essential issue, which can be of special value for the design of new LM materials with desired properties. So far, some available strategies such as molecular dynamics (MD) simulation and classical thermodynamic theory have been applied to perform correlative analysis. This paper is primarily dedicated to performing a comprehensive overview regarding typical theoretical strategies on analyzing the melting points. It, then, presents evaluations on several factors like components, pressure, size and supercooling that may be critical for melting processes of liquid metal. After that, it discusses applications associated with the characteristic of low melting points of LM. It is expected that a great many fundamental and practical works are to be conducted in the coming future.

关键词： melting point     liquid metal     crystal     thermodynamics     molecular dynamics    

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Ion beam figuring of continuous phase plates based on the frequency filtering process

Mingjin XU,Yifan DAI,Xuhui XIE,Lin ZHOU,Shengyi LI,Wenqiang PENG

《机械工程前沿（英文）》 2017年 第12卷 第1期   页码 110-115 doi: 10.1007/s11465-017-0430-5

摘要：

Ion beam figuring (IBF) technology is an effective technique for fabricating continuous phase plates (CPPs) with small feature structures. This study proposes a multi-pass IBF approach with different beam diameters based on the frequency filtering method to improve the machining accuracy and efficiency of CPPs during IBF. We present the selection principle of the frequency filtering method, which incorporates different removal functions that maximize material removal over the topographical frequencies being imprinted. Large removal functions are used early in the fabrication to figure the surface profile with low frequency. Small removal functions are used to perform final topographical correction with higher frequency and larger surface gradient. A high-precision surface can be obtained as long as the filtering frequency is suitably selected. This method maximizes the high removal efficiency of the large removal function and the high corrective capability of the small removal function. Consequently, the fast convergence of the machining accuracy and efficiency can be achieved.

关键词： ion beam figuring (IBF)     continuous phase plates (CPPs)     machining accuracy     machining efficiency     frequency filtering process    

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Dual-reaction-center catalytic process continues Fenton’s story

Chao Lu, Kanglan Deng, Chun Hu, Lai Lyu

《环境科学与工程前沿（英文）》 2020年 第14卷 第5期 doi: 10.1007/s11783-020-1261-x

摘要： Abstract • Dual-reaction-center (DRC) system breaks through bottleneck of Fenton reaction. • Utilization of intrinsic electrons of pollutants is realized in DRC system. • DRC catalytic process well continues Fenton’s story. Triggered by global water quality safety issues, the research on wastewater treatment and water purification technology has been greatly developed in recent years. The Fenton technology is particularly powerful due to the rapid attack on pollutants by the generated hydroxyl radicals (•OH). However, both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reaction mechanism, which depends on the oxidation and reduction of the transition metal ions at single sites. So even after a century of development, this reaction still suffers from its inherent bottlenecks in practical application. In recent years, our group has been focusing on studying a novel heterogeneous Fenton catalytic process, and we developed the dual-reaction-center (DRC) system for the first time. In the DRC system, H2O2 and O2 can be efficiently reduced to reactive oxygen species (ROS) in electron-rich centers, while pollutants are captured and oxidized by the electron-deficient centers. The obtained electrons from pollutants are diverted to the electron-rich centers through bonding bridges. This process breaks through the classic Fenton mechanism, and improves the performance and efficiency of pollutant removal in a wide pH range. Here, we provide a brief overview of Fenton’s story and focus on combing the discovery and development of the DRC technology and mechanism in recent years. The construction of the DRC and its performance in the pollutant degradation and interfacial reaction process are described in detail. We look forward to bringing a new perspective to continue Fenton’s story through research and development of DRC technology.

关键词： Dual reaction centers     Fenton     Pollutant utilization     Electron transfer    

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标题 作者 时间 类型 操作

Erratum to ‘‘Modeling and Experimental Validation of the Electron Beam Selective MeltingProcess” [Engineering 3 (2017) 701–707]

Wentao Yan, Ya Qian, Weixin Ma, Bin Zhou, Yongxing Shen, Feng Lin

期刊论文

用于介观模拟电子束选区熔化的数据挖掘技术

钱亚, 闫文韬, 林峰

期刊论文

电子束选区熔化过程的建模研究及实验验证

闫文韬, 钱亚, 马维馨, 周斌, 沈泳星, 林峰

期刊论文

双金属电子束选区熔化的硬件开发与成形实验

郭超, 葛文君, 林峰

期刊论文

Fabrication and in vivo evaluation of Ti6Al4V implants with controlled porous structure and complex shape

Xiang LI, Yun LUO, Chengtao WANG, Wenguang ZHANG, Yuanchao LI

期刊论文

disrupting chemicals from water through urethane functionalization of microfiltration membranes via electronbeam irradiation

期刊论文

Effects on mechanical properties in electron beam welding of TC4 alloy by laser shock processing

LU Jinzhong, ZHANG Yongkang, KONG Dejun, REN Xudong, GE Tao, ZOU Shikun

期刊论文

Simultaneous Feammox and anammox process facilitated by activated carbon as an electron shuttle for autotrophic

期刊论文

Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

期刊论文

纳米测量仪器和纳米加工技术

姚骏恩

期刊论文

激光相变热处理对TC４电子束焊缝残余应力的影响

鲁金忠,张永康,孔德军,任旭东,邹世坤,王西昌

期刊论文

Build orientation determination of multi-feature mechanical parts in selective laser melting via multi-objective

期刊论文

Room temperature liquid metal: its melting point, dominating mechanism and applications

Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU

期刊论文

Ion beam figuring of continuous phase plates based on the frequency filtering process

Mingjin XU,Yifan DAI,Xuhui XIE,Lin ZHOU,Shengyi LI,Wenqiang PENG

期刊论文

Dual-reaction-center catalytic process continues Fenton’s story

Chao Lu, Kanglan Deng, Chun Hu, Lai Lyu

期刊论文