检索结果-南通市图书馆

Ultrafine microstructure development in laser polishing of selective laser melted Ti alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第24期83卷 1-6页

作者： Yuhang Li Xu Cheng yingchun guan School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing100191China School of Materials Science and Engineering Beihang UniversityBeijing100191China School of Mechanical Engineering and Automation Beihang UniversityBeijing100083China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing100083China International Research Institute for Multidisciplinary Science Beihang UniversityBeijing100083China

*** Titanium(Ti)alloys have been widely used in aerospace[1],biomedical industries[2],marine and offshore[3],due to their high yield strength,low density,good biocompatibility and outstanding corrosion resistance[4-6].Compared with traditional material processing methods,such as forging[7],stamping[8]and casting[9],additive manufacturing(AM)has attracted much attention to produce complex components close to their final prototypes with the formation of an ultrafine eutectoid microstructure caused by high cooling rates under multiple thermal cycles[2].

关键词： microstructure alloy corrosion

Interfacial Features of Stainless Steel/Titanium Alloy Multi-metal Fabricated by Laser Additive Manufacturing

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1357-1364页

作者： Jialin Yang Xing Li Hanbo Yao yingchun guan Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang 62i900China Hefei Inovation Research Institute of Beihang University Anhui 230012China School of Mechanical Engineering and Automation Beihang UniversityBejing 100083China National Engineering Laboratory of Additive Manufacturing for Large Metallic.Components Beihang UniversityBejing 100083China

Laser additive manufacturing(LAM)is promising for fabricating multi-metallic component,but the mechanism of microstructural evolution at the interface of two metals is still needed to research *** this study,a 316L stainless steel/Ti6Al4V alloy multi-metal was fabricated by LAM,and the mechanism of intermetallic phase transformation was deeply *** show that a strong reaction zone(SRZ)can be induced at the interface of the *** phase constituents at the SRZ vary fromχ(Ti_(5)Fe_(17)Cr_(5))+Fe_(2)Ti+α′-Ti+β-Ti or FeTi to Fe_(2)Ti+χwhen the laser power is *** the scanning speed is further decreased,the thickness of the SRZ is significantly increased,andα′-Ti phase is also formed at this region besides Fe_(2)Ti andχ***,the micro-hardness at the SRZ is increased,caused by the intermetallic phase transformation and elemental interdiffusion at the interface.

关键词： Laser additive manufacturing Stainless steel/titanium alloy Multi-metal Intermetallic phase Microstructural evolution

Tailoring metallic surface properties induced by laser surface processing for industrial applications

在线全文

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 2019年第1期2卷 29-34页

作者： Guoqing Hu Yang Song yingchun guan School of Mechanical Engineering & Automation Beihang University Hefei Innovation Research Institute Beihang University National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang University

As a simple, reproducible, and pollution-free technique with the potential of integration and automation, laser processing has attracted increasing attention. Laser processing, which includes laser polishing, laser cleaning,and fabrication of laser-induced micro-/nano-structures, has been demonstrated to yield smooth, clean, functional surfaces and effective joining. Laser polishing is an advanced, highly efficient, and ecofriendly polishing technology. This study demonstrated the laser polishing of a selective laser-melted Inconel 718(IN718) superalloy and a titanium alloy sample. The surface roughnesses Raand Rzof the IN718 superalloy were respectively reduced from 8 and 33 μm to 0.2 and 0.8 μm, and the Raof the titanium alloy was reduced from 9.8 μm to 0.2 μ***, the wear resistance and corrosion resistance of the IN718 were apparently improved. As another surface-related processing method, laser cleaning was used to clean terminal blocks. Almost all the contaminants were removed, as verified by the absence of their chemical compositions and the decreased surface roughness. In addition, a superhydrophobic surface with a contact angle of over 160° and sliding angle of b8° on stainless steel was obtained by laser texturing treatment. These results demonstrate the high potential of laser processing in the scientific, technological, and industrial fields.

关键词： Laser processing Laser polishing Laser cleaning Superhydrophobicity

A beam flexure-based nanopositioning stage supporting laser direct-write nanofabrication

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第8期59卷 50-55页

作者： Zhen Zhang Peng Wang Peng Yan yingchun guan State Key Laboratory of Tribology and Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua University Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Key Laboratory of High-efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical EngineeringShandong University School of Automation Science and Electrical Engineering Beihang University School of Mechanical Engineering and Automation Beihang University

A nanopositioning system of both millimetric stroke and nanometric tracking accuracy is a key component for nanofabrication in many applications. In this paper, a novel bi-axial beam-flexure nano servo stage is proposed to support a direct writing system for femtosecond laser nanofabrication. The important features of the stage lie in: a mirror symmetric instead of rotational symmetric configuration is adopted to restrict cross axis coupling, and a novel Z-shaped guidance module is proposed to achieve relative large linear stiffness range, in addition a redundant constraints module is introduced to increase off-axis stiffness of the stage. Mechanical analysis and system identification are provided, with which a feedback control algorithm demonstrates the tracking capability for laser fabrication purposes. Based on the fabricated XY nano-stage, real time control and measurements are deployed, demonstrating the millimetric operating workspace and 77.8 nm(RMS) error of tracking a circular trajectory.

关键词： laser nanofabrication direct writing servo and control system

A Laser Scanner-Stage Synchronized System Supporting the Large-Area Precision Polishing of Additive-Manufactured Metallic Surfaces

在线全文

学校读者我要写书评

暂无评论

Engineering 2021年第12期7卷 1732-1740页

作者： Mengjia Cui Libin Lu Zhen Zhang yingchun guan State Key Laboratory of Tribology&Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control Tsinghua UniversityBeijing 100084China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing 100083China International Research Institute for Multidisciplinary Science Beihang UniversityBeijing 100083China Advanced Manufacturing Center Ningbo Institute of TechnologyBeihang UniversityNingbo 315100China

This paper proposes a scanner–stage synchronized approach emphasizing a novel control structure for the laser polishing of Inconel 718 components manufactured by selective laser melting in order to address increasing demands for high surface quality in metal additive *** proposed synchronized control system is composed of a motion decomposition module and an error synthesis *** experimental results show that stitching errors can be avoided thanks to continuous motion during laser ***,in comparison with the existing step-scan method,the processing efficiency of the proposed method is improved by 38.22%and the surface quality of the laser-polished area is significantly enhanced due to a more homogeneous distribution of the laser energy during the material phase *** proposed synchronized system paves the way for high-speed,high-precision,and large-area laser material processing without stitching errors.

关键词： Laser polishing Stitching errors Synchronized control system Additive manufacturing

Engineered Functional Surfaces by Laser Microprocessing for Biomedical Applications

在线全文

学校读者我要写书评

暂无评论

Engineering 2018年第6期4卷 822-830页

作者： Guoqing Hu Kai guan Libin Lu Jiaru Zhang Nie Lu yingchun guan School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China Hefei Innovation Research Institute Beihang UniversityHefei 230013China Department of Oncology Center of ExcellenceBOE Hefei Digital Hospital Co.Ltd.Hefei 230013China Beijing Long March Space Vehicle Research Institute First Academy of the China Aerospace CorporationBeijing 100076China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing 100083China

Metallic biomaterials are increasingly being used in various medical applications due to their high strength,fracture resistance,good electrical conductivity,and ***,their practical applications have been largely limited due to poor surface *** microprocessing is an advanced method of enhancing the surface-related properties of *** work demonstrates the capability of laser microprocessing for biomedical metallic materials including magnesium and titanium alloys,with potential applications in cell adhesion and liquid *** investigate laser-material interaction,microstructural evolution,and surface performance,and analyze cell behavior and the surface-enhanced Raman scattering(SERS)***,we explore a theoretical study on the laser microprocessing of metallic alloys that shows interesting results with potential *** results show that cells exhibit good adhesion behavior at the surface of the laser-treated surface,with a preferential direction based on the textured structure.A significant SERS enhancement of 6×10^3 can be obtained at the laser-textured surface during Raman measurement.

关键词： Laser microprocessing Functional surface Metallic alloy Niocompatibility SERS

油润滑和干摩擦条件下微织构对齿轮啮合噪声的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

机械传动 2025年第1期49卷 130-136页

作者：张龙唱陈奇管迎春李兴姚含波庆振华合肥工业大学机械工程学院合肥230009 北京航空航天大学合肥创新研究院合肥230012

【目的】目前利用微织构方法降低齿轮啮合噪声的研究较少,且多停留在计算机仿真以及等效试样试验层面,未见针对微织构齿轮噪声性能的理论分析和台架试验,有必要掌握油润滑和干摩擦条件下微织构对齿轮啮合噪声的影响规律。【方法】构建... 详细信息

【目的】目前利用微织构方法降低齿轮啮合噪声的研究较少,且多停留在计算机仿真以及等效试样试验层面,未见针对微织构齿轮噪声性能的理论分析和台架试验,有必要掌握油润滑和干摩擦条件下微织构对齿轮啮合噪声的影响规律。【方法】构建了齿面啮合噪声计算模型,采用激光加工技术制作微织构齿轮,搭建了齿轮啮合噪声检测平台,并在油润滑和干摩擦条件下对微织构齿轮和无织构齿轮的啮合传动噪声进行了测试。【结果】结果表明,在油润滑和干摩擦条件下,微织构均有助于降低齿轮啮合噪声;同时,初步验证了齿轮啮合噪声计算模型的有效性。

关键词：微织构齿轮齿轮啮合噪声计算模型油润滑条件干摩擦条件

Improving bonding strength of W/Cu dual metal interface through laser microstructuring method

在线全文

学校读者我要写书评

暂无评论

Light(Advanced Manufacturing) 2024年第3期5卷 86-92页

作者： Xing Li Quanjie Wang Libing Lu yingchun guan Wei Zhou Hefei Innovation Research Institute of Beihang University Hefei230012China Ningbo Institute of Technology Beihang UniversityNingbo315832China School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang UniversityBeijing100191China School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang Avenue639798Singapore

Selective laser melting(SLM)is a promising technology for fabricating complex components with W/Cu dual *** enhance the interfacial bonding of W/Cu dual metal,we propose a novel approach using laser texturing to fabricate micro/nanostructures on the W *** micro/nanostructures promoted the spreading of Cu in the liquid,inhibited defects,and considerably increased the contact area between W and Cu by mechanical *** the best of our knowledge,a W/Cu dual metal was successfully prepared by SLM without a transition layer the first *** bonding strength of the two materials reached 123 MPa,close to that of a W/Cu dual metal joint prepared by diffusion bonding.

关键词： W/Cu dual metal Selective laser melting Laser texturing Mechanical interlocking Tensile properties

异质金属激光增材制造研究及应用进展(特邀)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国激光 2024年第10期51卷 48-69页

作者：马毅管迎春北京航空航天大学机械工程与自动化学院北京100083 北京航空航天大学大型金属构件增材制造国家工程实验室北京100191

极端服役环境对空天等核心构件可靠性和集成性提出了严峻挑战。传统单一材料体系和制造工艺难以满足复杂性能需求。激光增材制造技术是实现异质金属结构-功能一体化的有效途径,但异质材料兼容问题(易诱发缺陷、加工参数响应不一等)限制... 详细信息

极端服役环境对空天等核心构件可靠性和集成性提出了严峻挑战。传统单一材料体系和制造工艺难以满足复杂性能需求。激光增材制造技术是实现异质金属结构-功能一体化的有效途径,但异质材料兼容问题(易诱发缺陷、加工参数响应不一等)限制了高质量异质界面的形成,这对制造装备与连接工艺提出了更高挑战。本文基于异质金属激光增材制造的最新研究进展,聚焦异质金属成型的关键问题及解决方案,回顾了近年来异质金属体系的发展及空天领域应用,从送粉方式、复合制造等方面介绍了激光增材装备的改进策略,总结了近年来激光增材技术在连接方式、参数调控、监测预测和前后端处理方面的研究进展,并针对这一技术的共性及难点问题给出了展望与思考。

关键词：激光技术异质金属空天应用增材装备增材制造工艺