Additive manufacturing letters最新文献_第4页

Effect of laser parameters and shielding gas flow on co-axial photodiode-based melt pool monitoring signals in laser powder bed fusion 激光参数和屏蔽气体流量对激光粉末床熔融中基于同轴光电二极管的熔池监测信号的影响

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-19 DOI: 10.1016/j.addlet.2024.100244

Joni Reijonen

{"title":"Effect of laser parameters and shielding gas flow on co-axial photodiode-based melt pool monitoring signals in laser powder bed fusion","authors":"Joni Reijonen","doi":"10.1016/j.addlet.2024.100244","DOIUrl":"10.1016/j.addlet.2024.100244","url":null,"abstract":"<div><div>Melt pool monitoring using co-axial photodiodes is increasingly used for online quality monitoring in PBF-LB AM. However, the fundamental correlations between different processing conditions and the co-axial photodiode signals are not well understood. In this study the impact of laser parameters and the shielding gas flow speed on co-axial photodiode-based melt pool monitoring signals is established. It is shown that laser power has positive linear correlation with the photodiode signal, while the correlation with scanning speed is non-linear in the form of <em>y</em>=ax<sup>–b</sup>. The focal point position, scanning orientation and shielding gas flow speed have highly non-linear response on the photodiode signal, depending on the combinatorial effects of the parameters. These underlying physical correlations should be carefully assessed and taken into consideration when trying to establish correlations between photodiode-based melt pool monitoring signal and defect formation in the PBF-LB process.</div></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100244"},"PeriodicalIF":4.2,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000525/pdfft?md5=cbf9c1ba3b0f65a2fea5968c1f650aaa&pid=1-s2.0-S2772369024000525-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additively manufactured Nb-Ti-Si based alloy: As-built and heat-treated conditions 以铌钛硅为基础的添加式制造合金：坯料和热处理条件

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-17 DOI: 10.1016/j.addlet.2024.100242

Runqi Gao , Hui Peng , Hongbo Guo , Bo Chen

{"title":"Additively manufactured Nb-Ti-Si based alloy: As-built and heat-treated conditions","authors":"Runqi Gao , Hui Peng , Hongbo Guo , Bo Chen","doi":"10.1016/j.addlet.2024.100242","DOIUrl":"10.1016/j.addlet.2024.100242","url":null,"abstract":"<div><p>This work aims to fully characterise the Nb-Ti-Si based alloy (Nb-26Ti-16Si-2.2Al-2Cr), processed by the electron-beam powder-bed-fusion in both as-built and heat-treated conditions, to elucidate the microstructure-property relationships. The as-built condition has [001]-oriented columnar grains of the Nb<sub>3</sub>Si phase with the Nbss phase dispersed throughout the microstructure. The microhardness is 645.2 ± 6.7 HV<sub>0.5</sub>, and the indentation fracture toughness shows distinct directionality: 7.7 MPa·m<sup>1/2</sup> in the horizontal direction compared to 5.3 MPa·m<sup>1/2</sup> in the vertical direction. Both properties are comparable to the cast version. The directionality is attributed to the underlying mechanisms such as crack bridging, arrest, and micro-crack formation. By contrast, in the heat-treated condition, the alloy exhibits a dual-phase microstructure (Nbss and Nb<sub>5</sub>Si<sub>3</sub> phases) with near-equiaxed grain shape due to the Nb<sub>3</sub>Si phase decomposition. The fracture toughness increases to 12.1 MPa·m<sup>1/2</sup>, at the expense of a reduced microhardness of 564.4 ± 15.0 HV<sub>0.5</sub>.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100242"},"PeriodicalIF":4.2,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000501/pdfft?md5=4e9a54c3bc27837b474f34dc47844f58&pid=1-s2.0-S2772369024000501-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Jet on demand—A pneumatically driven molten metal jetting method for printing crack-free aluminum components 按需喷射--用于打印无裂纹铝制部件的气动驱动熔融金属喷射方法

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-17 DOI: 10.1016/j.addlet.2024.100240

Eric S. Elton, Kellen D. Traxel, Andrew J. Pascall, Jason R. Jeffries

{"title":"Jet on demand—A pneumatically driven molten metal jetting method for printing crack-free aluminum components","authors":"Eric S. Elton, Kellen D. Traxel, Andrew J. Pascall, Jason R. Jeffries","doi":"10.1016/j.addlet.2024.100240","DOIUrl":"10.1016/j.addlet.2024.100240","url":null,"abstract":"<div><div>Additive manufacturing (AM) of many traditional aluminum alloys is difficult due to hot cracking during cooling, which motivates investigating alternative AM methods that can mitigate this challenge. Here we demonstrate a new pneumatically driven molten metal jetting (MMJ) AM technique which uses a longer pressure pulse width to produce a jet of liquid metal that reaches the heated build plate. The “jet on demand” technique is utilized to build Al-6061 parts on heated build plates. Due to the large thermal mass contained in each jet, excellent adhesion is observed between droplets and layers while still maintaining dimensional control to produce parts with high relative densities (>98%). While as-printed parts exhibit different microstructure and hardness than traditional Al-6061, both microstructure and hardness are restored to traditionally processed values through a traditional T6 heat treatment. Microhardness values of 104 HV were obtained for printed Al-6061, which compares well to wrought properties. We observe that high build plate temperatures allow for lower solidification rates and eliminate hot cracking. These results point to a method for additively manufacturing traditional aluminum or other alloys that cannot currently be additively manufactured due to hot cracking.</div></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100240"},"PeriodicalIF":4.2,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000483/pdfft?md5=2d587638c9808e9d5184e4e2c4bcff5b&pid=1-s2.0-S2772369024000483-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep learning based automated quantification of powders used in additive manufacturing 基于深度学习的增材制造所用粉末自动定量分析

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-14 DOI: 10.1016/j.addlet.2024.100241

K.V. Mani Krishna , A. Anantatamukala , Narendra B. Dahotre

引用次数: 0

In-situ characterization of defect formation and elimination dynamics during electron beam melting using high-speed X-ray imaging 利用高速 X 射线成像对电子束熔化过程中的缺陷形成和消除动态进行现场表征

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-05 DOI: 10.1016/j.addlet.2024.100239

Jiandong Yuan , Luis I. Escano , Samuel J. Clark , Junye Huang , Ali Nabaa , Qilin Guo , Minglei Qu , Kamel Fezzaa , Lianyi Chen

{"title":"In-situ characterization of defect formation and elimination dynamics during electron beam melting using high-speed X-ray imaging","authors":"Jiandong Yuan , Luis I. Escano , Samuel J. Clark , Junye Huang , Ali Nabaa , Qilin Guo , Minglei Qu , Kamel Fezzaa , Lianyi Chen","doi":"10.1016/j.addlet.2024.100239","DOIUrl":"10.1016/j.addlet.2024.100239","url":null,"abstract":"<div><p>Electron beam melting (EBM), also known as electron beam powder bed fusion (EB-PBF), is a metal additive manufacturing (AM) technology that can make metal parts that are difficult, inefficient, or unachievable through conventional manufacturing routes and other AM technologies. However, a comprehensive understanding of the dynamics of electron beam-matter interactions in EBM remains elusive, which is a barrier for the development and adoption of EBM technology. Here, we report the dynamics and mechanisms of pore formation, pore elimination, and crack elimination in EBM. Three mechanisms of pore formation are observed: (1) pore formation from feedstock powders, (2) pore formation from pre-existing defects, and (3) pore captured by solidification front. One pore elimination mechanism is discovered: pore elimination due to metal vapor condensation, which is unique to EBM. One crack elimination mechanism is uncovered: crack elimination through remelting. These results will enhance the understanding of defect formation and evolution mechanisms in EBM and may inspire the invention of effective approaches to mitigate and control defects (porosity and cracks) in EBM.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100239"},"PeriodicalIF":4.2,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000471/pdfft?md5=4c8677c4726e2063dec2b6d8c31a7ae2&pid=1-s2.0-S2772369024000471-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser additive manufacturing of a carbon-supersaturated β-Ti alloy for biomaterial application 用于生物材料应用的碳过饱和 β-Ti 合金激光快速成型技术

IF 4.2

Additive manufacturing letters Pub Date : 2024-09-04 DOI: 10.1016/j.addlet.2024.100233

Mingqi Dong , Yu Zhang , Weiwei Zhou , Peng Chen , Zhenxing Zhou , Hiroyasu Kanetaka , Takuya Ishimoto , Yuichiro Koizumi , Takayoshi Nakano , Naoyuki Nomura

{"title":"Laser additive manufacturing of a carbon-supersaturated β-Ti alloy for biomaterial application","authors":"Mingqi Dong , Yu Zhang , Weiwei Zhou , Peng Chen , Zhenxing Zhou , Hiroyasu Kanetaka , Takuya Ishimoto , Yuichiro Koizumi , Takayoshi Nakano , Naoyuki Nomura","doi":"10.1016/j.addlet.2024.100233","DOIUrl":"10.1016/j.addlet.2024.100233","url":null,"abstract":"<div><p>Developing high-performance β-Ti alloys is a persistent and long-term demand for the advancement of next-generation biomaterials. In this study, a strategy of leveraging the unique characteristics of laser powder bed fusion (L-PBF) technique and nanocarbon materials was proposed to design a novel carbon-supersaturated β-Ti alloy. Ultrathin graphene oxide (GO) sheets were closely covering onto spherical Ti-15Mo-5Zr-3Al (Ti1553) powders, enhancing laser absorptivity while maintaining good flowability. Consequently, the GO-added Ti1553 builds tended to be denser than the initial ones, indicating an improved additive manufacturability. During <span>L</span>-PBF, GO sheets were completely dissolved into the Ti1553 matrix, generating fully carbon-supersaturated β-Ti structures with a reduced grain size. Thanks to the exceptional strengthening effects of high-concentration solid-solution carbon (∼0.05 wt%), the GO/Ti1553 builds achieved a high ultimate tensile strength of 1166 MPa. Moreover, as revealed by the immunofluorescence staining experiments, the GO/Ti1553 builds demonstrated a retained cytocompatibility. This study provides new insight into composition and processing design of high-performance Ti components for biomedical applications.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100233"},"PeriodicalIF":4.2,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000410/pdfft?md5=f91ca5affc8917d8cbab1f3b90e6769a&pid=1-s2.0-S2772369024000410-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the role of the preheat temperature in electron-beam powder bed fusion processed IN718 论预热温度在电子束粉末床熔融处理 IN718 中的作用

IF 4.2

Additive manufacturing letters Pub Date : 2024-08-31 DOI: 10.1016/j.addlet.2024.100238

Nana Kwabena Adomako , Michael Haines , Nima Haghdadi , Sophie Primig

{"title":"On the role of the preheat temperature in electron-beam powder bed fusion processed IN718","authors":"Nana Kwabena Adomako , Michael Haines , Nima Haghdadi , Sophie Primig","doi":"10.1016/j.addlet.2024.100238","DOIUrl":"10.1016/j.addlet.2024.100238","url":null,"abstract":"<div><p>Process parameters optimization in additive manufacturing (AM) is usually required to unlock superior properties, and this is often facilitated by modeling. In electron beam powder bed fusion (E-PBF), the preheat temperature is an important parameter to be optimized as it significantly influences the microstructure and properties. Here we compare the effect of two preheat temperatures (1000 and 950°C, above and below δ-phase solvus temperature) on the microstructural evolution of E-PBF IN718 Ni-based superalloy. Using thermal and thermo-kinetic modeling, we predict microstructural changes and compare them with experimental findings. A decrease of only 50°C in the preheat temperature has a low impact on the solidification microstructure with a slight reduction in columnar grain width. In the solid-state, higher preheating causes intergranular δ-phase precipitation, contributing to a higher γ\" precipitation potential, formation of co-precipitates, and higher hardness. The lower preheat temperature induces intergranular and intragranular δ-phase precipitation, reducing the γ\" precipitation potential and hardness. The chemical composition of γ' and γ\" is largely unaffected by the preheat temperature variation. These insights underscore the importance of preheat temperature optimization in microstructure design and property control during E-PBF.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100238"},"PeriodicalIF":4.2,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277236902400046X/pdfft?md5=477e53db60389c1888ac301d3dfb2fff&pid=1-s2.0-S277236902400046X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additive manufacturing of novel aluminium matrix composites with enhanced strength and processability via boron nitride functionalization 通过氮化硼功能化快速制造具有更高强度和加工性能的新型铝基复合材料

IF 4.2

Additive manufacturing letters Pub Date : 2024-08-30 DOI: 10.1016/j.addlet.2024.100237

Giuseppe Del Guercio , Federico Bosio , Chinmay Phutela , Stuart Robertson , Nesma T. Aboulkhair

{"title":"Additive manufacturing of novel aluminium matrix composites with enhanced strength and processability via boron nitride functionalization","authors":"Giuseppe Del Guercio , Federico Bosio , Chinmay Phutela , Stuart Robertson , Nesma T. Aboulkhair","doi":"10.1016/j.addlet.2024.100237","DOIUrl":"10.1016/j.addlet.2024.100237","url":null,"abstract":"<div><p>The present work systematically investigates the effects of BN nanopowder functionalization on the processability, microstructure and tensile response of the custom Powder Bed Fusion Laser Beam (PBF-LB) Al alloy ‘AMALLOY3D’. The results show that a minor addition of BN (0.3 % by weight) not only produces near fully dense parts (99.91 %), but is also paired with improved flowability, enhancing the overall processability. Electron backscatter diffraction (EBSD) analysis revealed the transformation to a fully equiaxed grain structure in the BN-functionalized material, resulting in a 40 % increase in yield strength. Energy dispersive spectroscopy using a scanning transmission electron microscope (STEM-EDS) was employed to reveal the intricate secondary phases’ arrangements. These observations coupled with the help of the CALPHAD approach led to the reconstruction of the solidification history of AMALLOY3D and the BN-functionalized material. The present study unravels the complex dynamics leading to the columnar-to-equiaxed transition in BN-reinforced AMCs, proving that such unique microstructures and exceptional tensile properties can be achieved without compromising PBF-LB processability.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100237"},"PeriodicalIF":4.2,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000458/pdfft?md5=5417a120a2449cbec0b7c665db6ad06b&pid=1-s2.0-S2772369024000458-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion 用激光束粉末床熔合技术制造的铜合金强度随温度变化的异常现象

IF 4.2

Additive manufacturing letters Pub Date : 2024-08-24 DOI: 10.1016/j.addlet.2024.100236

Dasom Kim , Naoki Takata , Junji Umeda , Toshihiko Shimizu , Makoto Kobashi

{"title":"Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion","authors":"Dasom Kim , Naoki Takata , Junji Umeda , Toshihiko Shimizu , Makoto Kobashi","doi":"10.1016/j.addlet.2024.100236","DOIUrl":"10.1016/j.addlet.2024.100236","url":null,"abstract":"<div><p>This study reports an anomalous temperature-dependent tensile behavior of laser-beam powder bed fusion (PBF-LB) processed Cu–Cr–Zr alloy. The yield strength of the alloy initially decreases as the temperature increases to 200±5 MPa and then increases to 350±11 MPa at 500°C before reducing to 234±6 MPa at 600°C. The microstructure consists of elongated Cu grains with a high concentration of Cr solute (∼1 mass%), resulting from rapid solidification during the PBF-LB process. Transmission electron microscopy for the specimens deformed at 500°C revealed the presence of numerous nanoscale Cr-rich particles embedded inside the supersaturated solid solution of the Cu matrix. Nanoscale particles can act as barriers to dislocation motion, leading to an increase in internal stress during plastic deformation at elevated temperatures. This work provides the high potential of post heat treatments for achieving superior mechanical performance using high solute supersaturation formed by the PBF-LB process.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100236"},"PeriodicalIF":4.2,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000446/pdfft?md5=df4647e286e5713b4077aa24a5b81b74&pid=1-s2.0-S2772369024000446-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142086896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AMGPT: A large language model for contextual querying in additive manufacturing AMGPT：用于增材制造语境查询的大型语言模型

IF 4.2

Additive manufacturing letters Pub Date : 2024-08-22 DOI: 10.1016/j.addlet.2024.100232

Achuth Chandrasekhar , Jonathan Chan , Francis Ogoke , Olabode Ajenifujah , Amir Barati Farimani

{"title":"AMGPT: A large language model for contextual querying in additive manufacturing","authors":"Achuth Chandrasekhar , Jonathan Chan , Francis Ogoke , Olabode Ajenifujah , Amir Barati Farimani","doi":"10.1016/j.addlet.2024.100232","DOIUrl":"10.1016/j.addlet.2024.100232","url":null,"abstract":"<div><p>Generalized large language models (LLMs) such as GPT-4 may not provide specific answers to queries formulated by materials science researchers. These models may produce a high-level outline but lack the capacity to return detailed instructions on manufacturing and material properties of novel alloys. We introduce “AMGPT”, a specialized LLM text generator designed for metal AM queries. The goal of AMGPT is to assist researchers and users in navigating a curated corpus of literature. Instead of training from scratch, we employ a pre-trained Llama2-7B model from Hugging Face in a Retrieval-Augmented Generation (RAG) setup, utilizing it to dynamically incorporate information from <span><math><mo>∼</mo></math></span>50 AM papers and textbooks in PDF format. Mathpix is used to convert these PDF documents into TeX format, facilitating their integration into the RAG pipeline managed by LlamaIndex. A query retrieval function has also been added, enabling the system to fetch relevant literature from Elsevier journals based on the context of the query. Expert evaluations of this project highlight that specific embeddings from the RAG setup accelerate response times and maintain coherence in the generated text.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100232"},"PeriodicalIF":4.2,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000409/pdfft?md5=8d7e38c2365561cad4541597909ff24b&pid=1-s2.0-S2772369024000409-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142086895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0