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Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes

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Journal of materials Science & technology 2019年第7期35卷 1499-1507页

作者： decheng Kong Chaofang dong Xiaoqing Ni Liang Zhang Jizheng Yao Cheng Man Xuequn Cheng Kui Xiao Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection (MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3d-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and corrosion properties of 316 L stainless steel fabricated by selective laser melting. Sub-grains and low-angle boundaries exist in the as-received selective laser melted(SLMed) 316 L stainless steel. After heat treatment at 1050℃, the sub-grains and low-angle boundaries changed slightly, and the stress state and strength decreased to some extent due to the decrease of dislocation density. After heat treatment at 1200℃, the grains became uniform, and the dislocation cells vanished, which led to a sharp decline in the hardness and strength. However, the ductility was improved after recrystallization heat *** passive film thickness and corrosion potential of the SLMed 316 L stainless steel decreased after heat treatment, and the pitting potential also decreased due to the accelerated transition from metastable to steady-state pitting;this accelerated transition was caused by the presence of weak passive films at the enlarged pores after heat treatment, especially for an adequate solid solution treatment.

关键词： 316L stainless steel Selective laser melting Heat treatment Microstructure Mechanical property Corrosion behaviour

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developing Bioengineered 3d Printed Composite Scaffolds with Osteogenic Potential for Personalized Bone Tissue Grafts

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SSRN 2024年

作者： Cristescu, Andreea Liciu, Eduard Busuioc, Cristina Stancu, Izabela-Cristina Banciu, Adela Nicolae, Carmen dragomir, Mihai Cristea, doru-daniel Sabău, Rosina-Elena Nițulescu, david-Andrei Paraschiv, Alexandru 3D Printing Laboratory Center of Innovation and e-Health „Carol Davila" University of Medicine and Pharmacy 20 Pitar Moș Street Bucharest020021 Romania Faculty of Chemical Engineering and Biotechnologies University Politehnica of Bucharest 1-7 Gh. Polizu Street Bucharest011061 Romania Faculty of Medical Engineering University Politehnica of Bucharest 1-7 Gh. Polizu Street Bucharest011061 Romania REOROM Laboratory Hydraulics Department Politehnica University of Bucharest 313 Splaiul Independenţei 060042 Romania Special Components for Gas Turbines Department Romanian Research and Development Institute for Gas Turbine COMOTI 220D Iuliu Maniu Bucharest061126 Romania Advanced Polymer Materials Group

The purpose of this research activity was to produce composite hydrogel-bioactive glass materials. The primary goal was to develop and optimize 3d printed scaffolds using doped bioglass, aiming at enhancing bone regeneration in bone defects. The bioglass, a bioactive material known for its bone-bonding ability (SiO2–P2O5–CaO–Na2O), co-doped with europium and silver was synthesized and doped to improve its biological properties. This doped bioglass was then combined with a biocompatible hydrogel, chosen for its adequate cellular response and printability. The composite material was printed to form a scaffold, providing a structure that not only supported the damaged bone, but also encouraged osteogenesis. A variety of methods were employed to assess the rheological, compositional, structural, and morphological characteristics of the samples: Fourier Transformed Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) coupled with Energy-dispersive X-ray Spectroscopy (EdS). Additionally, immunocytochemistry for cell viability was used to evaluate the biological response of the scaffolds. © 2024, The Authors. All rights reserved.

关键词： Fourier transform infrared spectroscopy

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A Novel Bio-Inspired Advanced Functional Architectured materials with Interlocking designs for Multi-Functional Properties

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SSRN 2022年

Natural structures use many different two-dimensional or three-dimensional architectures in their designs, which can be extremely optimized, light-weight, and adaptable to their surrounding conditions. Taking inspiration from nature and applying their design principles would make optimized engineering solutions in a future sustainable world. In this study, the potential of edge-to-edge tessellation based materials is examined for their ability to deliver multi-functional properties through a single bulk material. The characteristics of nature and natural phenomena are closely examined and mimicked while designing these materials. The tessellation-backed, bio-mimicked materials are named ‘ Advanced Functional Architectured materials (AFAMs)’. In this study, the structural and functional properties of each AFAM were evaluated under experimental and numerical analysis. Moreover, the properties of the AFAMs were benchmarked against existing designs of truss-based and surface-based materials. The study reveals that each AFAM behaves uniquely, almost as different material, in terms of its load-bearing and cushioning abilities. All the AFAMs are designed in such a way that they can be interlocked with minimum interfacial dissimilarities to deliver multi-material properties. The interfacial strength was evaluated to examine the possibility of delamination. The study reveals that the interfacial strengths of interlocked AFAMs are similar to individual AFAM. © 2022, The Authors. All rights reserved.

关键词： Strength of materials

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Adaptive Mechanical Properties and Stretchability of Novel Chainmail Fabrics Based on Overlapping Tessellation Strategies

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SSRN 2023年

作者： Bhat, Chinmai Kumar, Ajeet Lin, Shang-Chih Jeng, Jeng-Ywan Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd Taipei106 Taiwan High Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd Taipei106 Taiwan Department of Design Indian Institute of Technology Assam Guwahati781039 India Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd Taipei106 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 Dasyue Rd East District Tainan701 Taiwan

This study introduces a novel design and additive manufacturing of technical textiles to achieve tunable mechanical properties through the tessellations of a singular material. The design of these chainmail fabrics was inspired by overlapping tessellation strategies found in biological structures. Two types of chainmail fabrics —BCC and FCC were designed to exhibit high flexibility and stretchability with two-dimensional degrees of freedom. The fabrics were designed to bend along two orthogonal axes and drape around curved surfaces. Furthermore, the relative placement of the unit cells was adjusted to selectively arrest the degrees of freedom, resulting in chainmail fabrics with tunable flexibilities and mechanical properties. Four fabrics for each design Fabric-A, Fabric-B, Fabric-C, and Fabric-d were developed with varying degrees of freedom. All the designed chainmail fabrics were additively manufactured using HP-MJF powder bed fusion technology with a polyamide-12 material. The mechanical properties of the fabricated samples were evaluated through experimental tension tests and numerical simulations. The fabricated BCC and FCC chainmail fabrics exhibited a stress-free zone, followed by an elastoplastic zone, with different mechanical properties observed at different orientations. The FCC fabrics outperformed the BCC fabrics with 45° orientation, exhibiting excellent load-bearing properties, and the 0° orientation showed superior energy absorption capacity. The numerical simulations accurately predicted the mechanical properties and failure locations. Fabric-A was highly flexible but had compromised load-bearing and energy-absorption abilities, whereas Fabric-d acted as a rigid lattice structure with exceptional load-bearing and energy-absorbing properties. FCC fabrics are easier to manufacture using various polymer additive processes owing to their supportless nature. Tunable technical fabrics such as these have potential applications in lightweight and adaptive

关键词： 3d printing

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Enhancing Mechanical & Functional Properties with Additively Manufactured Powder-Filled Closed Cell Lattice Structures

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SSRN 2023年

作者： Raj, Ritik Kumar, Ajeet Lin, Shang-Chih Jeng, Jeng-Ywan Taiwan High-Speed 3D Printing Research Center National Taiwan University of Science and Technology No. 43 Sec 4 Keelung Rd Taipei106 Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec 4 Keelung Rd Taipei106 Taiwan Department of Mechanical Engineering Indian Institute of Technology Guwahati Assam Guwahati India Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology No. 43 Sec 4 Keelung Rd Taipei106 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No. 1 Dasyue Rd Tainan City701 Taiwan

Enhancing the mechanical and functional characteristics of additively manufactured design can be achieved through various methodologies. In this fundamental study, a novel method for improving closed-cell lattice structures properties by incorporating powder infill. This cutting-edge technique not only improves the lattice's quality, but also integrates new functional properties. To achieve this, a hybrid setup combining material extrusion 3d printing and powder dispensing has been developed, enabling the simultaneous printing of polymer and dispensing of powder within closed-cell lattices. The aim of this hybrid system is to enable direct digital manufacturing (ddM), which combines two processes to unlock new possibilities for fabricating materials with multiple materials, structures, and functionalities. It allows for the creation of intricate features that would not be economically feasible using separate processes. Here, the local and global closed-cell supportless lattice structure (SU) is additively manufactured with thermoplastic polyurethane (TPU 95A) following with nylon 12 (PA-12) as powder filling inside of the structure. Both numerical simulations and experimental testing were performed to examine and compare the mechanical properties of the lattice structure. These properties include the load-bearing capacity, specific stiffness of material, and specific energy absorption. The structures with the same relative density were used as reference points for the comparison. In addition, the influence of unit cell size on its mechanical characteristics was investigated and thoroughly discussed. As the main result of the study, powder-filled local closed lattice structure has higher strength and energy absorption than global closed lattice structure. The possible application for these could be the next generation bunkers in order to provide better protection, other protective equipment’s, impact-resisting bodies, or the energy-absorbing components. © 2023, The A

关键词： Extrusion

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A versatile and double cross-linked hydrogel with potent antibacterial and immunomodulatory Zn@Met nanocomplexes for enhanced diabetic-infected wound healing

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Chemical Engineering Journal 2025年 516卷

作者： Chen, Tinglong Zhang, Xueliang Zhou, Shengzhe Fang, dong Luo, dinghao Ran, Zhaoyang Liu, Yingchun Xu, Cheng Cao, Jinhao Li, Xiaodong Hao, Yongqiaong Wang, Xiaoqing deng, Liang Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic Surgery Shanghai Ninth People's Hospital Shanghai Jiao Tong University School of Medicine Shanghai200011 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China Department of Plastic and Reconstructive Surgery Shanghai Ninth People's Hospital Shanghai Jiao Tong University School of Medicine 200011 China Department of Orthopedic Surgery Luan People's Hospital Luan Hospital Affiliated of Anhui Medical University Anhui Luan237001 China Department of Nephrology Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai200233 China School of Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing Technology Shanghai200011 China

Persistent infections, oxidative stress, and vascular damage in diabetic wounds require multifunctional dressings tailored to complex wound healing process. Herein, a coordination nanocomplexes of Zn@Met were synthesized by chelating Zn2+ with metformin (Met). These coordination nanocomplexes were subsequently integrated into an injectable self-healing hydrogel comprising methacrylic anhydride-modified gelatin (GelMA) and oxidized konjac glucomannan (OKGM). Through free-radical polymerization as well as hydrogen and schiff base bonds formation, we fabricated an pH-responsive composite hydrogel, named GO@ZM, which exhibited remarkable antibacterial efficacy, antioxidant capabilities, and potent modulation of inflammatory responses. In the final stages of wound healing, the composite hydrogel significantly enhanced macrophage polarization, angiogenesis, and collagen deposition, expediting the wound site's re-epithelialization process. Collectively, this study introduces a pioneering hydrogel for the treatment of infected diabetic wounds and holds the potential to spark fresh perspectives on the development of high-performance hydrogels for diverse biomedical applications. © 2025

关键词： Free radical polymerization

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deep learning networks in the segmentation of the left atrial appendage in 2d ultrasound: A comparative analysis

Deep learning networks in the segmentation of the left atria...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Rafael Fernandes Helena R. Torres Bruno Oliveira João Azevedo Karen Fan Alex P. Lee João L. Vilaça Pedro Morais 2Ai - School of Technology IPCA Barcelos Portugal LASI-Associate Laboratory of Intelligent Systems Guimarães Portugal Algoritmi Center School of Engineering University of Minho Guimarães Portugal Life and Health Sciences Research Institute (ICVS) School of Medicine University of Minho Braga Portugal ICVS/3B's - PT Government Associate Laboratory Braga/Guimarães Portugal Department of Medicine and Therapeutics Division of Cardiology Prince of Wales Hospital Hong Kong China Laboratory for Cardiac Imaging and 3D Printing Li Ka Shing Institute of Health Science Faculty of Medicine The Chinese University of Hong Kong Hong Kong China

Left atrial appendage (LAA) is the major source of thromboembolism in patients with non-valvular atrial fibrillation. Currently, LAA occlusion can be offered as a treatment for these patients, obstructing the LAA through a percutaneously delivered device. Nevertheless, correct device sizing is a complex task, requiring manual analysis of medical images. This approach is sub-optimal, time-demanding, and highly variable between experts. different solutions were proposed to improve intervention planning, but, no efficient solution is available to 2d ultrasound, which is the most used imaging modality for intervention planning and guidance. In this work, we studied the performance of recently proposed deep learning methods when applied for the LAA segmentation in 2d ultrasound. For that, it was created a 2d ultrasound database. Then, the performance of different deep learning methods, namely Unet, UnetR, AttUnet, TransAttUnet was assessed. All networks were compared using seven metrics: i) dice coefficient; ii) Accuracy iii) Recall; iv) Specificity; v) Precision; vi) Hausdorff distance and vii) Average distance error. Overall, the results demonstrate the efficiency of AttUnet and TransAttUnet with dice scores of 88.62% and 89.28%, and accuracy of 88.25% and 86.30%, respectively. The current results demonstrate the feasibility of deep learning methods for LAA segmentation in 2d *** relevance— Our results proved the clinical potential of deep neural networks for the LAA anatomical analysis.

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A Feedback-based Print Quality Improving Strategy for FdM 3d printing: An Optimal design Approach

Research Square

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research Square 2021年

作者： Tami, Tariku Sinshaw Xiong, Gang Fang, Qihang dong, Xisong Shen, Zhen Wang, Fei-Yue The State Key Laboratory for Management and Control of Complex Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing100190 China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100049 China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan523808 China

Fused deposition modelling (FdM) 3d printing, as a supporting technology in social manufacturing and cloud manufacturing, is a rapidly growing technology in the era of industry 4.0. It produces objects with the layer-by-layer material accumulation technique. However, qualitative uncertainties are the common challenges yet. In order to assure print quality, studying the error causing parameters and minimizing their effects is important. This paper presents a feedback-based error compensation strategy, which integrates fuzzy inference system and grey wolf optimization algorithm. The objectives are twofold. First, the possible errors in FdM 3d printing are discussed in detail and optimal error causing parameters are obtained in percentage. This is used to understand the effects of the printing errors in every phase of the 3d printing process. From the nine optimization configuration trials used, Config-6 that has 100 number of iterations and 60 wolves is selected due to its higher convergence speed and best fitness value. The integral absolute error (IAE) is used as an objective function and the global minimum is achieved in the iteration interval [86, 100]. The outputs of this optimization problem is used to achieve the next objective. Second, a closed-loop quality monitoring approach comprising of inner-loops and an outer-loop is utilized. The three inner-loops are used to monitor the errors during pre-printing, printing, and post-printing, respectively. The outer-loop, on the other hand, is responsible for monitoring the aggregated errors in all the three 3d printing phases. The error compensation system simulation in Matlab is run for 10 seconds, and the results show that the "normal" range deformation factors are reached within less than 2 seconds for the inner-loops, whereas the outer-loop deformation factor is achieved within 7 seconds. The responses are within the acceptable time range. © 2021, CC BY.

关键词： 3d printers

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‘Plug-and-play’ plasmonic metafibers for ultrafast fibre lasers

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Light(Advanced Manufacturing) 2022年第4期3卷 27-38页

作者： Lei Zhang Huiru Zhang Ni Tang Xiren Chen Fengjiang Liu Xiaoyu Sun Hongyan Yu Xinyu Sun Qiannan Jia Boqu Chen Benoit Cluzel Philippe Grelu Aurelien Coillet Feng Qiu Lei Ying Wei E.I.Sha Xiaofeng Liu Jianrong Qiu ding Zhao Wei Yan duanduan Wu Xiang Shen Jiyong Wang Min Qiu College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024Zhejiang ProvinceChina Laboratory of Infrared Material and Devices&Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province Advanced Technology Research InstituteNingbo UniversityNingbo 315211China Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 UniversitéBourgogne Franche-Comté9 avenue Alain Savary21078 DijonFrance Interdisciplinary Center for Quantum Information and Department of Physics Zhejiang UniversityHangzhouChina School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Metafibers expand the functionalities of conventional optical fibres to unprecedented nanoscale light manipulations by integrating metasurfaces on the fibre tips,becoming an emerging light-coupling platform for both the nanoscience and fibre optics *** metafibers remain proof-of-concept demonstrations that mostly explore isolated bare fibres owing to the lack of standard interfaces with universal fibre ***,we develop methodologies for fabricating well-defined plasmonic metasurfaces directly on the end facets of commercial single-mode fibre jumpers using standard planar technologies and provide the first demonstration of their practical applications in the nonlinear plasmonic *** plug-and-play connections with fibre circuitry and arbitrary metasurface landscapes,the metafibers with tunable plasmonic resonances are implemented into fibre laser cavities,yielding all-fibre sub-picosecond(minimum 513 fs)soliton mode locked lasers at optical wavelengths of 1.5μm and 2μm,demonstrating their unusual polarimetric nonlinear transfer functions and superior saturation absorption *** nanofabrication process flow is compatible with existing cleanroom technologies,offering metafibers an avenue to become a regular member of functionalised fibre *** work paves the way toward the next generation of ultrafast lasers,optical frequency combs,and ultracompact‘all-in-fibre’optical systems.

关键词： Nonlinear plasmonics Metasurfaces Metafibers Fibre lasers Saturable absorption

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Mechanical Properties of GH4169 superalloy Prepared by Selective Laser Melting

Mechanical Properties of GH4169 superalloy Prepared by Selec...

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作者： Guohui Zhang Shaoqing Guo Shuai Huang Biao Zhou Taiqi Yan Bingqing Chen Xuejun Zhang 3D Printing Research Engineering Technology Center Beijing Institute of Aeronautical Materials

Using selective laser melting technique,3 sets of GH4169 samples were formed by various laser power and scanning speed to prepare mechanical properties test *** defects and porosity of the samples were measured by CT *** tensile test was carried out at room *** fracture morphology of the tensile samples was observed by SEM and the fracture mechanism was *** results show that some samples have pores with largest size of 100μm,which have no effect on the subsequent tensile properties *** tensile strength does not change significantly with the varying process parameters,and the highest strength could reach 1480 *** elongation and the reduction of area decrease gradually as the scanning speed increases,indicating that the plasticity of the material is *** fracture mechanism of the three sets specimens are ductile fractures,and the microscopic morphology shows distribution of equiaxed dimples.

关键词： Mechanical Properties of GH4169 superalloy Prepared by Selective Laser Melting

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