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Performance and wear mechanisms of TiAlN-NbN coated cemented carbide in milling Ti6Al4V with different cooling and lubrication approaches

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Wear 2025年 571卷

作者： Lindvall, rebecka Casas Gayubo, Josu Gutnichenko, Oleksandr Auzenat, François M'Saoubi, rachid Bushlya, Volodymyr Division of Production and Materials Engineering Lund University Ole Römers Väg 1 Lund221 00 Sweden R&D Milling and Process Seco Tools France 22 Avenue de La Prospective Bourges18 000 France R&D Materials and Technology Development Seco Tools AB Fagersta737 82 Sweden

Titanium alloys are difficult-to-machine materials given their high strength, the high temperatures generated, and the naturally short contact length that combined result in rapid tool wear. different machining strategies can be employed to cope with the low machinability. This study investigates the machining performance using different cooling and lubrication methods during down face milling of the most employed Ti alloy Ti6Al4V. The conditions include a dry environment, flood coolant, and sustainable vegetable oil applied at minimum quantity lubrication (MQL) condition. The tool life at dry conditions and with MQL applied vegetable oil are similar but MQL shows promising potential in prolonging tool life. Flood coolant provided no beneficial effect and tool life was about 50 % shorter as to dry and MQL conditions. The tool wear evolution on as-worn tools and their cross-sections is studied in scanning electron microscope using X-ray energy-dispersive spectroscopy. The PVd applied TiAlN-NbN coated WC-12%Co tools are worn by mechanical fracturing which is additionally accelerated by the outward diffusion of C from WC and Co binder that facilitate WC grain pull-out. Oxidation of Co binder further weakens the tool material mechanically. © 2025 The Authors

关键词： Titanium alloys

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Intelligent Prediction technology for Production of Tight Oil Based on data Analysis 13th

Intelligent Prediction Technology for Production of Tight Oi...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Li, Ning Wu, Xiang-Hong Li, Xin Wang, Zhi-Ping Wang, Yue-Zhong Zhao, Li-Ao ren, Liang Wang, Hong-Liang Tian, Hong-Yu ren, Shu-Hang Jiang, Si-rui Research Center of Artificial Intelligence Research Institute of Petroleum Exploration and Development PetroChina Beijing China Artificial Intelligence Technology R&D Center for Exploration and Development CNPC Beijing100083 China Department of Asia-Pacific E&P Research Institute of Petroleum Exploration and Development PetroChina Beijing China

ISBN: (纸本)9789819702718

China is rich in tight oil resources, with a wide distribution range and a large amount of resources, making it one of the key areas for strategic replacement of future oil reserves and production. In response to issues such as strong heterogeneity of terrestrial tight oil reservoirs, difficulty in drilling high-quality oil layers, large production differences, and unclear main control factors for production capacity, a detailed analysis of dynamic and static data of production wells was conducted to analyze production performance and decline patterns. Production wells were classified according to production characteristics, and development indicators at different stages were statistically analyzed based on actual production days. Using a combination of principal component analysis and Pearson correlation coefficient, based on multiple dynamic and static data such as geological factors, fracturing factors, and development factors, and analyzing the correlation between different single and combined factors and cumulative oil production at different stages, the main control factors for different production stages of tight oil were obtained. A production capacity prediction model for tight oil fracturing horizontal wells was established based on machine learning intelligent algorithms, A production capacity evaluation and prediction technology for tight oil fracturing horizontal wells has been developed. By comparing with actual production data, the accuracy of the predicted results can meet production needs, providing a strong technical foundation for precise prediction and guidance of tight oil production in China. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Quality control

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An Efficient Fully Automated detection of Mucormycosis Using Three-dimensional deep Learning on Computer Tomography Studies

An Efficient Fully Automated Detection of Mucormycosis Using...

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2023 International Conference on recent Advances in Electrical, Electronics, Ubiquitous Communication, and Computational Intelligence, rAEEUCCI 2023

作者： Shivaanivarsha, N. Kavipriya, P. Shyamkumar, M. Sathyabama Institute of Science and Technology Department of Ece Chennai India Sri Sairam Engineering College Chennai India R&d Executive Research & Development Vision Chennai India

ISBN: (纸本)9798350337426

In recent days, many people die of pulmonary embolism (PE) complications, respiratory problems that form in the deep lung. Covid-19 is the leading cause of preventable hospital death for trauma patients and despite 0.1% of the population receiving a new diagnosis annually. developing computer-aided detection (CAd) systems would alleviate these concerns;however, current systems classify computed tomography (CT) slices individually and yield many false positives from Covid-19. We have done a retrospective study on a dataset collected from various health central hospitals. There is a continued need for tools that can predict Covid and black fungal in hospitalized patients. It affects an estimated 3000-6000 Individuals just in recent days. This can cause considerable morbidity and mortality. For segmentation and classification, we mortality. For segmentation and classification, we use a 2d dense-Net. By developing more effective detection algorithms, we hope to ensure a more frequent and accurate diagnosis of covid, thereby reducing its high mortality rate. reports have shown that black fungus is steadily increasing in India as well as the death toll it causes. It has been called 'a pandemic within the Covid-19 pandemic' by medical specialists. Black fungus, or Mucormycosis, is a complication caused by a fungal infection. In India Mucormycosis has been detected in Karnataka, Uttarakhand, Telangana, Madhya Pradesh, Andhra Pradesh, Haryana, and Bihar, Primarily, fungal spores floating in the environment gives people this infection. This spreads through contact. The fungi sticks to a body part and travels inside through the nose, lungs or sinus. © 2023 IEEE.

关键词： Fungi

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Evolution of surface quality in micromilling Ti-6A1-4V alloy with increasing machined length

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Procedia CIrP 2024年 123卷 221-226页

作者： Maria Clara Coimbra Gonçalves rob Alsters david Curtis rachid M’Saoubi Hassan Ghadbeigi University of Sheffield Mechanical Engineering Department Mappin Street Sheffield UK R&D Materials and Technology Development Seco Tools AB Zandterweg 14 5973 RC Lottum Netherlands Advanced Manufacturing Research Centre University of Sheffield Rotherham S60 5TZ UK R&D Materials and Technology Development Seco Tools AB 737 82 Fagersta Sweden Division of Production and Materials Engineering Lund University Ole Römers väg 1 221 00 Lund Sweden

Micromilling is a subtractive manufacturing process that presents challenges due to scale effects and rapid tool wear. To understand the evolution of surface quality when increasing the machined length during the micromilling process, this study assessed the surface roughness, topography, and defects of slots micromilled on Ti-6A1-4V. For the experiments, 1 mm diameter flat end mills were employed, and the cutting parameters were varied using a full factorial design. Subsequently, the surface texture field parameter S a was assessed every 20 mm, up until the machining length of 260 mm. The analysed results led to the conclusion that, for the adopted set of parameters and the machining length of up to 260 mm, surface roughness was not significantly correlated to the machined length in the micromilling process of Ti-6A1-4V, as the Pearson coefficient, obtained from the correlation analysis, was -0.052. However, the surface roughness was mainly influenced by feed rate (Pearson coefficient of 0.82), with higher feed rates leading to roug surfaces (up to S a = 0.4 µm) duhere to the tool load increase that causes wider feed marks on the surface. regarding the feed marks, they were affected by the tool rotational frequency due to system vibration. Additionally, surface defects of adhered material, smearing, tearing and side flow were observed. For lower feeds, material adhesion was the main type of defect observed, while higher feed rates favoured the side flow phenomenon.

关键词： micromilling surface quality tool wear

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Advanced 4d drilling dynamics Model Simulates downhole Vibration and Helps to Optimize in Preventing drill String Failure

Advanced 4D Drilling Dynamics Model Simulates Downhole Vibra...

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2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Zhang, Jiawei Wang, Qing du, Shiliang Zhuo, Lubin Liu, Wei Ling, Bo CNPC Engineering Technology R&D Company Limited Beijing China China National Oil and Gas Exploration and Development Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Qinghai Oilfield Company Gansu Dunhuang China

ISBN: (纸本)9781959025269

downhole vibration, such as backward or chaotic whirling, is one of the primary causes for drill string failure during drilling operation. Understanding drilling dynamics is crucial for determining the mechanism of vibration and fatigue accumulation so as to mitigate risk of drill string failure. drilling dynamics or vibration data can either be obtained from real-time measurement or simulation based on dynamics model, which plays a crucial role for drilling optimization in pre-drill planning phase. An advanced 4d drilling dynamics model, which considers the interaction between drill bit and formation, impact and friction between drill string and wellbore, constraints exerted on drill string and drill bit, is proposed to simulate the distribution and variation of 3d displacement, velocity, acceleration as well as the stress state of entire drill string within specified time period. This time domain model allows exploration of the full range of dynamics response under different drilling scenarios, which helps to optimize the performance and reliability of BHA as well as WOB/rPM selection. Moreover, drill string fatigue life prediction can also be achieved by combing simulated stress state and fatigue accumulation theory. Simulation shows that BHA with smaller- sized drill collar or fewer stabilizers are more susceptible to backward and even chaotic whirling while drilling. Also, inappropriate WOB/rPM combinations such as low WOB with high rPM could also cause the onset of severe lateral vibration. High frequency bending stress, mainly concentrated on BHA and caused by lateral vibration, is the main reason for rapid fatigue accumulation and continuous severe vibration could even result in drill string fatigue failure within hours. These findings helped to justify the 5 consecutive BHA failure and 1 washout while drilling the 171/2" wellbore with 7621 ft length of an ultra-deep well. Simulation also showed that downhole lateral vibration severity was significantly redu

关键词： drill collars

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High-coercivity heavy-rare-earth-free NdFeB sintered magnets developed by doping Ce85Al15and grain boundary diffusion with Pr70Cu15Al15

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AIP Advances 2023年第2期13卷 1-5页

作者： Wong, Y.J. Chang, H.W. Lee, Y.I. Chang, W.C. Chiu, C.H. Mo, C.C. Department of Physics National Chung Cheng University Chia-Yi621 Taiwan New Materials Research and Development Department China Steel Corp. Kaohsiung812 Taiwan R&D Department Himag Magnetic Corporation Pingtung912 Taiwan

Traditional NdFeB sintered magnets with coercivity larger than 20 kOe, called super-high (SH) level, usually contains considerable amount of high-cost heavy rare earth (HrE), such as dy or Tb. In this work, high coercivity of 21.4 kOe, which corresponds to SH level, is achieved for HrE-free NdFeB magnet by doping with Ce85Al15 (CeAl) alloy and grain boundary diffusion (GBd) with Pr70Cu15Al15 (PrCuAl) alloy powders, where Ce/rE ratio is about 15% within the magnet. After GBd treatment with PrCuAl on Ce-containing NdFeB magnets, the formation of Pr-containing shell at 2:14:1 grain surface can increase the local magnetic anisotropy filed and therefore enhance the coercivity. Most of Cu and Al, and parts of Ce and Pr appear at grain boundary and triple junction, which can reduce the magnetization of grain boundary phase, strengthen the decoupling effect between grains and thus contribute to high coercivity. This study provides a cost-effective way to obtain high coercivity for HrE-free NdFeB sintered magnet via doping Ce85Al15 and then GBd with Pr70Cu15Al15. © 2023 Author(s).

关键词： Aluminum alloys

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Integrating Sulfobetaine Methacrylate Hydrogel-Modified Cellulose Triacetate Filter into a Zwitterionized Tandem Membrane System for Exosome Isolation

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ACS Applied Polymer materials 2024年第5期6卷 2741-2751页

作者： Lee, Chih-Ling Vu, Cao-An Vu, Van-Truc Cheng, Chao-Min Chang, Yung Chen, Wen-Yih Department of Chemical and Materials Engineering National Central University Taoyuan City320317 Taiwan Institute of Biomedical Engineering National Tsing Hua University Hsinchu300044 Taiwan R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Zhongli District Taoyuan City320314 Taiwan

Purifying exosomes from various biotissue samples is critical for downstream analysis for diagnosis and prognosis because these extracellular vesicles not only carry enriched genetic materials but also play multiple roles in several diseases. This study designed an easy-to-operate exosome isolation method by integrating a zwitterionic tandem membrane system in which one of the filters was modified with sulfobetaine methacrylate (SBMA) hydrogel to prevent clogging and isolating exosomes from other biomolecules without impinging their biological contents. The surfaces of SBMA-coated cellulose triacetate (CTA) membranes were analyzed by XPS, AFM, SEM, and coating density. Their performance was investigated in terms of hydration capacity, hydrophobicity, filtration ability, and resisting unwanted adhesion. Empirical results demonstrated that surface modification with SBMA endowed the zwitterionized CTA membrane with superior antifouling properties without altering its filtration performance and also successfully isolated exosomes from other biomaterials in a sequential filtration where it was integrated with another zwitterionic membrane. The zwitterionic membrane system developed in this study could sequester exosomes secreted from HCT116 cells with high yield and innate immune traits for downstream analysis using an easy-to-operate procedure without requiring expensive instruments and trained personnel, proposing a promising approach to isolate exosomes in biological samples for further analysis. © 2024 The Authors. Published by American Chemical Society

关键词： Membranes

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Effects of heat treatments on microstructures of TiAl alloys

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International Journal of Minerals,Metallurgy and materials 2022年第6期29卷 1225-1230页

作者： Wen Yu Jianxin Zhou Yajun Yin Zhixin Tu Xin Feng Hai Nan Junpin Lin Xianfei ding State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Beijing Institute of Aeronautical Materials Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This study aims to investigate the effects of heat treatments on the microstructure ofγ-TiAl *** Ti-47Al-2Cr-2Nb alloy ingots were manufactured by casting method and then heat-treated in two types of heat *** microstructures were studied by both optical and scanning electron *** chemical compositions of two ingots were determined as *** ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within1270 to 1185℃.A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated *** are distributed at grain boundaries when holding at a higher temperature,such as 1260℃.However,B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185℃.Furthermore,the effects of heat treatments on grain refinement and other microstructural parameters are discussed.

关键词： TiAl alloys microstructure heat treatment casting

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Coupling N-doping and rich oxygen vacancies in mesoporous ZnMn_(2)O_(4)nanocages toward advanced aqueous zinc ion batteries

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Nano research 2022年第9期15卷 8118-8127页

作者： Can Huang Qiufan Wang daohong Zhang Guozhen Shen Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science Hubei R&D Center of Hyperbranched Polymers Synthesis and ApplicationsSchool of Chemistry and Materials ScienceSouth-Central Minzu UniversityWuhan 430074China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

The development of a high specific capacity and stable manganese(Mn)-based cathode material is very attractive for aqueous zinc-ion(Zn^(2+))batteries(ZIBs).However,the inherent low electrical conductivity and volume expansion challenges limit its stability ***,a mesoporous ZnMn_(2)O_(4)(ZMO)nanocage(N-ZMO)coupled with nitrogen doping and oxygen vacancies is prepared by defect engineering and rational structural design as a high-performance cathode material for rechargeable *** oxygen vacancies enhance the electrical conductivity of the material and the nitrogen doping releases the strong electrostatic force of the material to maintain a higher structural ***,N-ZMO exhibits excellent ability of Zn^(2+)storage(225.4 mAh·g^(−1)at 0.3 A·g^(−1)),good rate,and stable cycling performance(88.4 mAh·g^(−1)after 1,000 cycles at 3 A·g^(−1)).Furthermore,a flexible quasi-solid-state device with high energy density(261.6 Wh·kg^(−1))is assembled,demonstrating long-lasting *** believe that the strategy in this study can provide a new approach for developing aqueous ZIBs.

关键词： nitrogen(N)-doping oxygen vacancies defect zinc-ion(Zn^(2+))storage flexible quasi-solid-state device

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development of Intrinsic room-Temperature 2d Ferromagnetic Crystals for 2d Spintronics

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Chinese Physics Letters 2023年第5期40卷 71-77页

作者：靳雯张高节武浩杨丽张文峰常海欣 Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2d)ferromagnetic crystals with fascinating optical and electrical properties are crucial for nanotechnology and have a wide variety of applications in ***,low Curie temperatures of most 2d ferromagnetic crystals seriously hinder their practical applications,thus searching for intrinsic roomtemperature 2d ferromagnetic crystals is of great importance for development of information ***,progresses have been achieved in the last few *** we review recent advances in the field of intrinsic room-temperature 2d ferromagnetic crystals and introduce their applications in spintronic devices based on van der Waals ***,the remaining challenge and future perspective on the development direction of intrinsic room-temperature 2d ferromagnetic crystals for 2d spintronics and van der Waals spintronics are briefly summarized.

关键词： ferromagnetic summarized searching

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