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Effect of Y_(2)O_(3) on microstructure and properties of CoCrFeNiTiNb high entropy alloy coating on Ti-6Al-4V surface by laser cladding 被引量:3
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作者 Zhen Li Wei Zhao +4 位作者 Kedong Yu Ning Guo Guangchun Xiao Zhiming Wang Hui Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第3期586-599,I0006,共15页
The effects of Y_(2)O_(3) on the microstructure, microhardness, wear resistance, high-temperature oxidation resistance, hot corrosion resistance, and electrochemical corrosion behaviour of CoCrFeNiTiNb high entropy al... The effects of Y_(2)O_(3) on the microstructure, microhardness, wear resistance, high-temperature oxidation resistance, hot corrosion resistance, and electrochemical corrosion behaviour of CoCrFeNiTiNb high entropy alloy coatings formed on Ti-6Al-4V alloy surfaces were studied. The results show that the addition of Y_(2)O_(3) changes the proportion of the phase but does not change its type. The average grain size is only 1/4.7 of that of the high entropy alloy(HEA) coating, and the fine-grained strengthening leads to increases in the microhardness and wear resistance of 21.8% and 26.9%, respectively. The addition of Y_(2)O_(3) enhances the denseness and bonding properties of the oxide and corrosion product layers, reducing the oxidation and hot corrosion rates by 60.3% and 40.3%, respectively. The addition of Y_(2)O_(3) doubles the corrosion resistance which is attributed to the refinement of the grains, the increased proportion of HCP and TiN, and the weakening of galvanic coupling corrosion. 展开更多
关键词 Laser cladding High entropy alloy coatings Rare earths Wear properties High temperature properties Electrochemical corrosion
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Numerical analysis and experimental research on detection of welding defects in pipelines based on magnetic flux leakage
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作者 Changsheng Zhang Jinpeng Bi +5 位作者 Yuexia Lv Mengli Li Yongying Qi Kai Zhou Ming Zhang Tingting Du 《Petroleum Research》 EI 2023年第4期550-560,共11页
Regular inspection of long-distance oil and gas pipelines plays an important role in ensuring the safe transportation of oil and gas,and inspection on welding defects is an important part of the inspection process.Mag... Regular inspection of long-distance oil and gas pipelines plays an important role in ensuring the safe transportation of oil and gas,and inspection on welding defects is an important part of the inspection process.Magnetic flux leakage(MFL)is an electromagnetic non-destructive testing technique which has been commonly utilized to detect welding defects in pipelines.In the present study,Maxwell electro-magnetic simulation software was used to carry out numerical study on the welding defects in pipelines,including incomplete penetration and undercut.TheФ406 pipeline with a wall thickness of 7 mm was selected as the study case to establish the numerical model.Setting the life-off value at 1 mm,the distribution of magnetic leakage field was investigated for pipeline without defect,pipeline with incomplete penetration defect and pipeline with undercut defect respectively,the characteristic values describing the depth and width of defects were found.Furthermore,quantified equations which can be used to describe the defect depth were proposed.Finally,experimental research was carried out to validate the effectiveness of the numerical model,and the experimental results showed good consistence with the numerical calculation results.The research results indicate that,it is technically feasible and reliable to diagnose the incomplete penetration and undercut welding defects in pipelines using MFL. 展开更多
关键词 Magnetic flux leakage Pipeline welding defect Incomplete penetration UNDERCUT
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The forty years of vermicular graphite cast iron development in China (Part Ⅰ) 被引量:4
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作者 QIU han-quan CHEN Zheng-de 《China Foundry》 SCIE CAS 2007年第2期91-98,共8页
In China, the research and development of vermicular graphite cast iron (VGCI) as a new type of engineering material, were started in the same period as in other developed countries; however, its actual industrial app... In China, the research and development of vermicular graphite cast iron (VGCI) as a new type of engineering material, were started in the same period as in other developed countries; however, its actual industrial application was even earlier. In China, the deep and intensive studies on VGCI began as early as the 1960s. According to the incomplete statistics to date, more than 600 papers on VGCI have been published by Chinese researchers and scholars at national and international conferences, and in technical journals. More than ten types of production methods and more than thirty types of treatment alloy have been studied. Formulae for calculating the critical addition of treatment alloy required to produce VGCI have been put forward, and mechanisms for explaining the formation of dross during treatment were brought forward. The casting properties, metallographic structure, mechanical and physical properties and machining performance of VGCI, as well as the relationships between them, have all been studied in detail. The Chinese Standards for VGCI and VGCI metallographic structure have been issued. In China, the primary crystallization of VGCI has been studied by many researchers and scholars. The properties of VGCI can be improved by heat treatment and addition of alloying elements enabling its applications to be further expanded. Hundreds of kinds of VGCI castings have been produced and used in vehicles, engines, mining equipment, metallurgical products serviced under alternating thermal load, machinery, hydraulic components, textile machine parts and military applications. The heaviest VGCI casting produced is 38 tons and the lightest is only 1 kg. Currently, the annual production of the VGCI in China is about 200 000 tons. The majority of castings are made from cupola iron without pre-treatment, however, they are also produced from electric furnaces and by duplex melting from cupola-electric furnaces or blast furnace-electric furnace. Examples of typical applications for VGCI castings are introduced in this paper. In China, the technologies such as rapid testing of the molten metal and non-destructive testing of casting microstructure still need to be improved. Several proposals are put forward in this paper in order to improve the production of VGCI. Generally speaking, in China, the research, production, and application of vermicular graphite cast iron are at the same level as in other developed countries and in some fields China even takes lead. (332 references and 5 Tables) 展开更多
关键词 vermicular graphite cast iron China REVIEW
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Analysis of the Collaborative Education System of Local Universities under the Fundamentals of“New Engineering”Construction 被引量:1
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作者 Jing Ma 《Journal of Contemporary Educational Research》 2021年第5期81-85,共5页
Based on the fundamentals of“new engineering”construction,this article briefly introduces the development standards of local colleges and universities,analyzes the significance of the collaborative education system ... Based on the fundamentals of“new engineering”construction,this article briefly introduces the development standards of local colleges and universities,analyzes the significance of the collaborative education system of local universities under the fundamentals of“new engineering”construction,and explores the fundamentals of“new engineering.”The specific implementation strategy of the collaborative education system of industry-university collaboration in local colleges and universities. 展开更多
关键词 “New engineering” Local colleges and universities Industry-university cooperation Model exploration
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The forty years of vermicular graphite cast iron development in China(Part Ⅲ)
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作者 QIU han-quan CHEN Zheng-de 《China Foundry》 SCIE CAS 2007年第4期261-269,共9页
5 Heat treatment of VGCIResearch work has shown that the microstructure of VGCI can be modified by heat treatment to give improved properties; martensitic, bainitic, sorbitic and pearlitic structures can be produced b... 5 Heat treatment of VGCIResearch work has shown that the microstructure of VGCI can be modified by heat treatment to give improved properties; martensitic, bainitic, sorbitic and pearlitic structures can be produced by quenching, quenching plus tempering, austempering and normalisation respectively. The surface properties of VGCI can also be improved by high frequency induction hardening, tufftriding and ion nitriding to meet special requirements. 展开更多
关键词 中国 球墨铸铁 发展趋势 热处理
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A Novel Meshfree Analysis of Transient Heat Conduction Problems Using RRKPM
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作者 Hongfen Gao Gaofeng Wei 《Computer Modeling in Engineering & Sciences》 SCIE EI 2022年第6期1793-1814,共22页
By introducing the radial basis functions(RBFs)into the reproducing kernel particle method(RKPM),the calculating accuracy and stability of the RKPM can be improved,and a novel meshfree method of the radial basis RKPM(... By introducing the radial basis functions(RBFs)into the reproducing kernel particle method(RKPM),the calculating accuracy and stability of the RKPM can be improved,and a novel meshfree method of the radial basis RKPM(meshfree RRKPM)is proposed.Meanwhile,the meshfree RRKPM is applied to transient heat conduction problems(THCP),and the corresponding equations of the meshfree RRKPM for the THCP are derived.The twopoint time difference scheme is selected to discretize the time of the THCP.Finally,the numerical results illustrate the effectiveness of the meshfree RRKPM for the THCP. 展开更多
关键词 Transient heat conduction meshfree method reproducing kernel particle method meshfree RRKPM two-point difference method
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Computer simulation of super-magnetoelastic behavior near critical region of magnetic materials based on phase-field method
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作者 Zhao Zhang Cheng-Chao Hu +7 位作者 An-Hang Zhou Yu-Xin Xu Yuan-Yuan Wu Hai-Hua Huang Hou-Bing Huang Jun-Jie Ni Wei Li Wei-Feng Rao 《Rare Metals》 SCIE EI CAS CSCD 2023年第8期2477-2488,共12页
Since the discovery of ferromagnetic morphotropic phase boundary(MPB)in 2010,the connotation and extension of MPB have been becoming more and more abundant.Over the last dozen years,much experimental work has been don... Since the discovery of ferromagnetic morphotropic phase boundary(MPB)in 2010,the connotation and extension of MPB have been becoming more and more abundant.Over the last dozen years,much experimental work has been done to design magnetostrictive materials based on the MPB principle.However,due to the difficulty in direct experimental observations and the complexity of theoretical treatments,the insight into the microstructure property relationships and underlying mechanisms near the ferromagnetic MPB has not been fully revealed.Here,we have reviewed our recent computer simulation work about the super-magnetoelastic behavior near the critical region of several typical materials.Phase-field modeling and simulation are employed to explore the domain configuration and engineering in single crystals as well as the grain size effect in polycrystals.Besides,a general nano-embryonic mechanism for superelasticity is also introduced.Finally,some future perspectives and challenges are presented to stimulate a deeper consideration of the research paradigm between multiscale modeling and material development. 展开更多
关键词 Super-magnetoelastic behavior Phase-field simulation Morphotropic phase boundary(MPB)
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Gut-on-a-chip for exploring the transport mechanism of Hg(II)
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作者 Li Wang Junlei Han +7 位作者 Weiguang Su Anqing Li Wenxian Zhang Huimin Li Huili Hu Wei Song Chonghai Xu Jun Chen 《Microsystems & Nanoengineering》 SCIE CSCD 2023年第1期215-227,共13页
Animal models and static cultures of intestinal epithelial cells are commonly used platforms for exploring mercury ion(Hg(II))transport.However,they cannot reliably simulate the human intestinal microenvironment and m... Animal models and static cultures of intestinal epithelial cells are commonly used platforms for exploring mercury ion(Hg(II))transport.However,they cannot reliably simulate the human intestinal microenvironment and monitor cellular physiology in situ;thus,the mechanism of Hg(II)transport in the human intestine is still unclear.Here,a gut-on-a-chip integrated with transepithelial electrical resistance(TEER)sensors and electrochemical sensors is proposed for dynamically simulating the formation of the physical intestinal barrier and monitoring the transport and absorption of Hg(II)in situ.The cellular microenvironment was recreated by applying fluid shear stress(0.02 dyne/cm^(2))and cyclic mechanical strain(1%,0.15 Hz).Hg(II)absorption and physical damage to cells were simultaneously monitored by electrochemical and TEER sensors when intestinal epithelial cells were exposed to different concentrations of Hg(II)mixed in culture medium.Hg(II)absorption increased by 23.59%when tensile strain increased from 1%to 5%,and the corresponding expression of Piezo1 and DMT1 on the cell surface was upregulated. 展开更多
关键词 INTESTINE TRANSPORT mechanism
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Recent progress of vanadium-based alloys for fusion application
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作者 Shao-Ning Jiang Fu-Jie Zhou +4 位作者 Gao-Wei Zhang Xiao-Ou Yi Chang-Wang Yu Xiu-Jie Wang Wei-Feng Rao 《Tungsten》 EI 2021年第4期382-392,共11页
Low-activation vanadium alloys,with the reference composition of V-4Cr-4Ti have been considered as one of the most promising candidate materials for structural components such as the blanket in future fusion reactors,... Low-activation vanadium alloys,with the reference composition of V-4Cr-4Ti have been considered as one of the most promising candidate materials for structural components such as the blanket in future fusion reactors,thanks to their excellent neutron irradiation resistance,superior high-temperature mechanical properties,and high compatibility with liquid lithium blankets.The self-cooled liquid lithium blanket using structural materials of vanadium alloys is an attractive concept because of the high heat transfer and high tritium breeding capability.After more than 2 decades of research,technological progress has been made in reducing the number of critical issues for application of vanadium alloys to fusion reactors.In this paper,the recent research and development activities of vanadium alloys are summarized,including significant progress achieved on fabrication technology and composition optimization,coating and corrosion,improved understanding of irradiation effects upon microstructure and material properties,retention of hydrogen isotopes,as well as advancements in joining and weld-ing.In particular,the fact that recent products from China,Japan,US and France showed similar properties which meant the fabrication technology has been almost standardized. 展开更多
关键词 Vanadium alloy FABRICATION Coating and corrosion Irradiation damage Hydrogen retention
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