IOP Conference Series: Materials Science and Engineering最新文献_第2页

On the chemical composition, microstructure and mechanical properties of a Nitrogen-contaminated Ti-6Al-4V component built by Wire-Arc Additive Manufacturing 线弧快速成型技术制造的氮污染 Ti-6Al-4V 零件的化学成分、微观结构和力学性能

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012020

D Hu, R Biswal, V K Sahu, J W Fellowes, A Zadehkabir, S W Williams, A E Davis

{"title":"On the chemical composition, microstructure and mechanical properties of a Nitrogen-contaminated Ti-6Al-4V component built by Wire-Arc Additive Manufacturing","authors":"D Hu, R Biswal, V K Sahu, J W Fellowes, A Zadehkabir, S W Williams, A E Davis","doi":"10.1088/1757-899x/1310/1/012020","DOIUrl":"https://doi.org/10.1088/1757-899x/1310/1/012020","url":null,"abstract":"Additive manufacturing (AM) using recycled Ti-6Al-4V (Ti64) feedstock material from wrought waste streams is a novel process that can reduce the overall energy cost and carbon (CO2) footprint when compared to primary-production routes. The potential contamination of recycled feedstock material (e.g. C, O, N and Fe) can affect the microstructure and mechanical properties of the component. In this work, a Ti64 test wall built using wire arc AM (WAAM) was studied, where the top half only was contaminated by N through the shielding gas during deposition. This allowed a direct comparison of Ti64 WAAM material with high and low N content, deposited under otherwise identical conditions, to replicate the worst-case scenario of N contamination from using recycled swarf. The hardness of the N-contaminated section was found to be 25% higher than the uncontaminated section of the wall, demonstrating the N solid solution strengthening in Ti64. The room temperature transformed microstructure was found to have a 25% coarser α-lath thickness, which was proposed to be an effect of the AM cyclical heating and increasing of the β-transus temperature due to a higher level of N. Additionally, the outer layer of the N-contaminated sample section was found to have a refined parent β grain structure.","PeriodicalId":14483,"journal":{"name":"IOP Conference Series: Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Open source tools for OpenFOAM - Adaptive mesh refinement and convergence detection OpenFOAM 的开源工具 - 自适应网格细化和收敛检测

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012013

Wouter Remmerie, Nikola Majksner

引用次数: 0

On the comparison between topological and surface sensitivities for bio-fluid dynamics applications 生物流体动力学应用中拓扑敏感性与表面敏感性的比较

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012001

Eric Segalerba, Emanuele Gallorini, Maurizio Quadrio, Jan Pralits

{"title":"On the comparison between topological and surface sensitivities for bio-fluid dynamics applications","authors":"Eric Segalerba, Emanuele Gallorini, Maurizio Quadrio, Jan Pralits","doi":"10.1088/1757-899x/1312/1/012001","DOIUrl":"https://doi.org/10.1088/1757-899x/1312/1/012001","url":null,"abstract":"Nasal Breathing Difficulties (NBD) consist of pathologies which are difficult to diagnose, heal and affect a high percentage of the population; the only way to treat these diseases is, most of the times, by surgery but the success rate is not very high since many patients have no relief from it. This should be attributed to the variety of the nose’s functions, which is far more complex than a simple duct to connect the environment to the lungs. CFD is emerging as an innovative approach to study these problems systematically; in this contribution the target is to use a method based on adjoint equations to get senstivity maps whose purpose is to provide surgeons with more informations on which are the regions, inside the nose, to focus on. This work focuses only on the reduction of the pressure drop across the nose, therefore a single objective function is used. Three different frameworks, with two formulations of the continuous adjoint equation method, are compared: in two cases topological sensitivities were used while in the latter the surface sensitivity was evaluated.","PeriodicalId":14483,"journal":{"name":"IOP Conference Series: Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Understanding superlinear speedup in current HPC architectures 了解当前高性能计算体系结构中的超线性加速功能

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012009

Flavio Cesar Cunha Galeazzo, R. Gregor Weiß, Sergey Lesnik, Henrik Rusche, Andreas Ruopp

{"title":"Understanding superlinear speedup in current HPC architectures","authors":"Flavio Cesar Cunha Galeazzo, R. Gregor Weiß, Sergey Lesnik, Henrik Rusche, Andreas Ruopp","doi":"10.1088/1757-899x/1312/1/012009","DOIUrl":"https://doi.org/10.1088/1757-899x/1312/1/012009","url":null,"abstract":"The performance of OpenFOAM in strong scaling tests on HPC systems with AMD EPYC processors exhibits a pronounced superlinear speedup. Simple test cases show superlinear speedups of over 300%, which significantly impacts the efficient use of computing resources.With the last generation of HPC architectures, a superlinear speedup of about 10% to 20% was well expected and accepted by CFD users [1]. The measured superlinear speedup is much more pronounced and withstands the communication overhead to even larger scales.A detailed performance analysis of OpenFOAM follows, employing various High-Performance Computing (HPC) architectures, including AMD, ARM and Intel systems. The performance metric FVOPS (Finite VOlumes solved Per Second) is introduced to compare the performance of Computational Fluid Dynamics (CFD) applications when varying the grid size, as occurs in a strong scaling test. The achievable FVOPS depends on various factors, including the simulation type, boundary conditions, and especially the grid size of a use case. Analysing FVOPS on a single node level with varying grid size shows a significant difference in performance and cache utilization, which explains the large superlinear speedups seen in the strong scaling tests.Furthermore, FVOPS can be used as a simple benchmark to determine the optimal number of grid elements per rank to simulate a given use case at peak efficiency on a given platform, resulting in time, energy, and cost savings.The FVOPS metric also facilitates the direct comparison between different HPC architectures. The tests using AMD, ARM, and Intel processors show a peak in performance when employing around 10,000 grid elements per core. The presence of a large L3 cache on AMD processors is particularly advantageous, as indicated by L3 cache miss rates observed on AMD EPYC processors. Our results suggest that future HPC architectures with larger caches and higher memory bandwidth would benefit the CFD community.","PeriodicalId":14483,"journal":{"name":"IOP Conference Series: Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterisation of T1 (Al2CuLi) Precipitates in Conventional (2099-T83) and Laser Additive Manufactured (PBF-LB/M, DED-LB/M) Microstructures 传统（2099-T83）和激光添加剂制造（PBF-LB/M、DED-LB/M）微结构中 T1（Al2CuLi）沉淀物的表征

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012003

F Adjei-Kyeremeh, C K Akuata, N Bansal, S Zischke, I Raffeis, A B Polaczek

引用次数: 0

Improved corrosion resistance of powder manufactured AISI 904L parts by hot isostatic pressing post treatment 通过热等静压后处理提高粉末制造的 AISI 904L 零件的耐腐蚀性能

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012018

A Sorea, P Valler, P Kjeldsteen, P Hjelmeborn

引用次数: 0

Evaluation of a carbon dioxide fish barrier with OpenFOAM 利用 OpenFOAM 评估二氧化碳鱼类屏障

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012003

M Politano, A Cupp, D Smith, A Schemmel, P R Jackson, J Zuercher

{"title":"Evaluation of a carbon dioxide fish barrier with OpenFOAM","authors":"M Politano, A Cupp, D Smith, A Schemmel, P R Jackson, J Zuercher","doi":"10.1088/1757-899x/1312/1/012003","DOIUrl":"https://doi.org/10.1088/1757-899x/1312/1/012003","url":null,"abstract":"The Chicago Area Waterway System (CAWS) is a potential route for the migration of aquatic invasive species from the Mississippi River basin into the Great Lakes. Electric deterrence barriers were constructed in the Chicago Sanitary Ship Canal (CSSC), within CAWS, to prevent invasive fish from reaching the Great Lakes. Despite the high efficiency of these barriers, occasional maintenance events are a weakness in the system that fish can exploit to access the Great Lakes. This study aimed to assess the feasibility of a carbon dioxide (CO2) infusion system to deter fish during the maintenance of the electric barriers. A simplified two-fluid model was implemented in the OpenFOAM solver to represent the underwater CO2 bubble plume and predict the concentration of dissolved CO2 in the canal. Simulations under three canal flowrates and two sparger systems were conducted assuming a constant gas flowrate. Numerical results indicate that, for all simulated conditions, the CO2 concentration is not fully mixed creating passageways that invasive fish could potentially use to migrate upstream. Injecting 4-mm bubbles induces two large-scale recirculations that are expected to synergistically improve fish avoidance. On the other hand, injection of 20 μm bubbles results on almost immediate dissolution with minimal impact on the flow pattern. To improve effectiveness, a pulse system was proposed to create a CO2 gradient, and thus promote a more responsive behaviour from fish. According to the simulations, this system not only increases efficiency but also extends the operation of the CO2 barrier. Moreover, the pulse concept mitigates potential impact of elevated CO2 downstream of the CSSC.","PeriodicalId":14483,"journal":{"name":"IOP Conference Series: Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Computational Fluid Dynamics Study on the Influence of Variable Cant Angle Winglets on Total Drag Reduction 可变翼尖角翼片对总阻力降低的影响的计算流体力学研究

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012012

Giulia Innocenti, Eric Segalerba, Joel Guerrero

引用次数: 0

Grain size assessment using EBSD on heterogeneous additively manufactured microstructures 利用 EBSD 对异质添加制造微结构进行晶粒尺寸评估

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012028

J del Gaudio, J Donoghue, P J Withers, A Garner, K Mingard, M Gee, A Gholinia

引用次数: 0

Microstructural characterization of AISI 440C stainless tool steel fabricated by laser powder bed fusion 利用激光粉末床熔融技术制造的 AISI 440C 不锈钢工具钢的微观结构特征

IOP Conference Series: Materials Science and Engineering Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012037

Z Pan, Y Zhang, M Defer, X Xiao, D Juul Jensen, V K Nadimpalli

引用次数: 0