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Real-time porosity reduction during metal directed energy deposition using a pulse laser

Journal of Materials Science & Technology 2022年第21期116卷 214-223页

作者： Hoon Sohn Peipei Liu hansol yoon Kiyoon Yi Liu Yang Sangjun Kim Department of Civil and Environmental Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Center for 3D Printing Nondestructive Testing Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Global R&D Center SQ EngineeringSeoul 05818Republic of Korea Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Porosity is a challenging issue in additive manufacturing and is detrimental to the quality of the additively manufactured *** this study,a real-time porosity reduction technique was developed by incorporating a pulse laser into a laser metal powder directed energy deposition(DED)*** incorporated pulse laser can accelerate fluid flow within the melt pool and facilitate the escape of pores before complete *** achieves this real-time porosity reduction by inducing accelerated and turbulent Marangoni flow,ultrasonic waves,and shock waves into the melt *** uniqueness and advantages of the proposed technique include the following:(1)For a laser metal powder DED process,this study proposed a noncontact,nondestructive,and real-time porosity reduction technique at the melt pool level.(2)It was experimentally and numerically validated that the developed technique did not alter the geometry and the grain structure of the manufactured Ti-6Al-4V samples.(3)Because the porosity reduction is accomplished at the melt pool level,its application is not limited by the size,shape,or complexity of the printing target.(4)The developed technique can be readily incorporated into the existing DED systems without any modification of the original tool-path *** experimental results showed that the pore volume fraction decreased from 0.132%to 0.005%,no pores larger than 6×10^(4)μm^(3) were observed,and a 91%reduction in the total pore number was achieved when the pulse laser energy reached 11.5 mJ.

关键词： Real-time porosity reduction Pulse laser Melt pool Directed energy deposition Ti-6Al-4V

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Wavefront shaping: A versatile tool to conquer multiple scattering in multidisciplinary fields

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The Innovation 2022年第5期3卷 80-94页

作者： Zhipeng Yu Huanhao Li Tianting Zhong Jung-Hoon Park Shengfu Cheng Chi Man Woo Qi Zhao Jing Yao Yingying Zhou Xiazi Huang Weiran Pang hansol yoon Yuecheng Shen Honglin Liu Yuanjin Zheng YongKeun Park Lihong V.Wang Puxiang Lai Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518052China Department of Biomedical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Tomocube Daejeon 34109Republic of Korea Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Avenue201800 SingaporeSingapore Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea KAIST Institute for Health Science and Technology KAISTDaejeon 34141Republic of Korea Department of Medical Engineering California Institute of TechnologyPasadenaCA 91125USA Department of Electrical Engineering California Institute of TechnologyPasadenaCA 91125USA Photonics Research Institute The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

Optical techniques offer a wide variety of applications as light-matter interactions provide extremely sensitive mechanisms to probe or treat target *** of these implementations rely on the usage of ballistic or quasi-ballistic photons to achieve high spatial ***,the inherent scattering nature of light in biological tissues or tissue-like scattering media constitutes a critical obstacle that has restricted the penetration depth of non-scattered photons and hence limited the implementation of most optical techniques for wider *** addition,the components of an optical system are usually designed and manufactured for a fixed function or *** advances in wavefront shaping have demonstrated that scattering-or component-induced phase distortions can be compensated by optimizing the wavefront of the input light pattern through iteration or by conjugating the transmission matrix of the scattering medium.

关键词： versatile hence iteration

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