检索结果-南通市图书馆

Surface recrystallization of a Ni_3Al based single crystal superalloy at different annealing temperatures and blasting pressure

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第3期31卷 209-214页

作者： WU Yuxiao a, YANG Ruibo a, LI Shusuo a, MA Yue a, gong Shengkai a, and HAN Yafang a, b a key laboratory of Aerospace materials and Performance (Ministry of Education), School of materials Science and Engineering, beijing university of Aeronautics and Astronautics, beijing 100191, china b beijing institute of aeronautical materials, beijing 100095, china key laboratory of Aerospace materials and Performance (Ministry of Education) School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China beijing institute of aeronautical materials Beijing China

The effects of annealing temperature and grit blasting pressure on the recrystallization behavior of a Ni3Al based single crystal superalloy were studied in this work. The results show that the precipitation of the Y-NiMo phase occurs at 900 and 1000 °C, which precedes recrystallization. The initial recrystallization temperature was between 1000 and 1100 °C. Cellular recrystallization was formed at 1100 and 1200 °C, which consisted of large columnar γ′ and fine γ + γ′. The dendrite arm closed to the interdendritic region may act as nucleation sites during initial recrystallization by a particle simulated nucleation mechanism at 1280 °C. The size of the grains first turned large and then became small upon the pressure while the recrystallization depth increased all the time.

关键词： recrystallization temperature pressure Ni3Al based single crystal superalloy nucleation

Effect of dendrite arm spacing and the γ' phase size on stress rupture properties of Ni_3Al-base single crystal superalloy IC6SX

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第6期53卷 1460-1465页

作者： JIANG LiWu1,LI ShuSuo1,WU MeiLing1 & HAN YaFang1,2 1 School of materials Science and Engineering,Beihang university,beijing 100191,china 2 beijing institute of aeronautical materials,beijing 100095,china School of materials Science and Engineering Beihang University Beijing China beijing institute of aeronautical materials Beijing China

The effect of dendrite arm spacing and the size of γ' phase on stress rupture properties of as-cast Ni3Al-based single crystal superalloy IC6SX was *** has been found that the stress rupture properties were affected by dendrite arm spacing and the size of γ' phase significantly,i.e.,the stress rupture lives of as-cast specimens under the test condition of 1100°C/120 MPa were significantly increased from about 10 h to 31 h with decreasing dendrite arm spacing and the size of γ' phase from 3.0 μm and 1.6 μm to 1.3 μm and 0.8 μm,*** creep cracks generated easily in the brittle Y-NiMo *** the cracks gradually mergered and grew up during creep,and finally led to specimens *** orientated coarsening of γ' phase has been found in the stress ruptured specimens,due to the elements ***,the γ' phase did not form the integrated structure during the short periods of 10-31 h as the creep tests lasted.

关键词： dendrite arm spacing size of γ’ phase Ni3Al-based single crystal stress rupture property

Influence of Ru addition on microstructure and stress-rupture property of Ni-based single crystal superalloys

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials International 2010年第1期20卷 61-69页

作者： Jing-yang CHEN~1,Qiang FENG~(1,2),La-mei CAO~3,Zu-qing SUN~1 1.State key laboratory for Advanced Metals and materials,university of Science and technology beijing, beijing 100083,china 2.National Center for materials Service Safety,university of Science and technology beijing,beijing 100083,china 3.National key laboratory of Science and technology on Advanced High Temperature Structural materials, beijing institute of aeronautical materials,beijing 100095,china State key laboratory for Advanced Metals and materials University of Science and Technology Beijing National Center for materials Service Safety University of Science and Technology Beijing National key laboratory of Science and technology on Advanced

The effects of Ru on the microstructure and stress-rupture property were investigated in two experimental Ni-based single crystal superalloys with and without Ru addition(5.1%,mass fraction).The results indicate that the morphology ofγ' precipitates in the dendrite core and interdendritic region are intermediate and nearly spherical,respectively,in the Ru-free alloy after being aged at 1100℃for 8 *** Re partitioning ratio increases due to Ru addition and Ru partitioned preferentially to theγphase in both dendrite core and interdendritic region of the Ru-containing alloy,which results in more negative lattice misfit and more cuboidalγ' ***,theγ' volume fraction increases while the precipitate size and y channel width decreases due to Ru addition in both dendrite core and interdendritic *** addition improves the stress-rupture life at 1100℃/140 MPa significantly due to higherγ' volume fraction,more negative lattice misfit and a well rafting structure as well as lessγchannel width.

关键词： Ni-based superalloys ruthenium elemental partitioning ratio lattice misfit γ’ morphology stress-rupture property

Microstructure and Texture Characterization in Nd:YAG Laser Welds of 5A90 Aluminum-Lithium Alloys

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 39-43页

作者： Cui Li1,Li Xiaoyan1,He Dingyong1,Chen Li2,gong Shuili21College of materials Science and Engineering,beijing university of technology,beijing 100124,china2Science and technology on Power Beam Processes laboratory,beijing aeronautical Manufacturing technology Research institute,beijing 100024,china beijing Univ Technol Coll Mat Sci & Engn Beijing 100124 Peoples R China beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

Microstructure and texture characterization in Nd:YAG laser welds of 5A90 Aluminum-Lithium (Al-Li) alloys were studied by means of optical microscope (OM),electron back scattered diffraction (EBSD) and transmission electron microscope (TEM).The solidification structure,misorientation angle,dislocation density and microtexture of the welds in 5A90 Al-Li alloys were investigated and compared with the unaffected base *** results show that microstructure and texture changes of the 5A90 Al-Li alloy after laser *** solidification structure results show that a zone of equiaxed grains (EQZ) along the fusion boundary is formed and the weld metal exhibits entirely equiaxed dendritic grains for 5A90 Al-Li *** study clearly shows the high angle boundaries (>15°) and microtexture changes for 5A90 Al-Li alloy after laser *** images indicate that the laser welding has no influence on the dislocation density.

关键词： laser welding Al-Li alloy microstructure texture EBSD

Investigation on the Effect of Electron Beam Weld Shape on Fatigue Performance of Thickness Titanium Alloy

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 125-129页

作者： Liu Xin1,2,gong Shuili2,Lei Yongping1 1School of Material Science and Engineering,beijing university of technology,beijing 100021,china2Science and technology on Power Beam Processes laboratory,beijing aeronautical Manufacturing technology Research institute,beijing 100024,china beijing Univ Technol Sch Mat Sci & Engn Beijing 100021 Peoples R China beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

Different weld shapes of 45mm thickness TA15 titanium alloy were obtained by choosing appropriate electron beam welding parameters,and the influence of weld shape on fatigue performance of the joints was investigated by analytic hierarchy *** results show that four typical weld shapes were formed,according to their geometry characters,which are respectively named as bell shape,funnel shape,nail shape,and wedge *** shape effect the fatigue life and dispersion of the experiment data of the *** sequencing of fatigue performance of the joints with four different shapes by analytic hierarchy mathematical model is bell shape,funnel shape,wedge shape,and nail *** is validated by trial results that the analytic hierarchy mathematical model is effective and practical.

关键词： weld shape fatigue performance analytic hierarchy process electron beam welding thickness titanium alloy

Research on Laser Forming technology of TA15 Titanium Alloy Sheet Metal

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 274-277页

作者： Wang Bin,gong Shuili,Ma Yilun,Zhao Xiaoming,Yao Wei Science and technology on Power Beam Processes laboratory,Avic beijing aeronautical Manufacturing technology Research institute,beijing 100024,china Avic beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

The forming process and influencing factors of laser forming of TA15 titanium alloy sheet metal are *** effects of line energy and area energy on sheet metal bending were *** bending rate did not increase linearly with line energy *** the line energy increased to a certain value,the bending rate decreased gradually for material surface *** influence of sheet thickness on laser forming was also *** with 3mm sheet,1.5mm sheet was bended easily and more sensitive to the *** metallurgical structure showed that the structure of heating area was divided into fusion zone,heat affected zone and intermediate zone.

关键词： laser forming TA15 sheet metal processing parameter

Study on the J-Integral and Failure Assessment Line of Electron Beam Welded Thick TC4-DT Alloy Joints

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 58-62页

作者： Lu Wei1,Shi Yaowu1,Li Xiaoyan1,Lei Yongping1,gong Shuili2,Guan Qiao2,Zhao Haiyan3 1 College of materials Science and Engineering,beijing university of technology,beijing 100124,china2 Science and technology on Power Beam Processes laboratory,beijing aeronautical Manufacturing technology Research institute,beijing 100124,china3 Dept of Mechanical Engineering,Tsinghua university,beijing 100084,china beijing Univ Technol Coll Mat Sci & Engn Beijing 100124 Peoples R China beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100124 Peoples R China Tsinghua Univ Dept Mech Engn Beijing 100084 Peoples R China

The effects of strength mis-matching on J-integral and failure assessment line (FAL) of electron beam welded thick TC4-DT titanium alloy joints have been *** and elastic-plastic finite elements (FE) calculations on centre crack tensile (CCT) specimens were made,and the condition of 20% strength mis-matching was *** results indicate that the limit load of the joint can be substituted by that of the base *** error of substitution is less than 5%.The failure assessment lines for both over-matching and under-matching joints are increasingly close to that of the base metal,with the ratio of weld width to specimen width (H/W) ***,the failure assessment lines of the joints can be devised using the stress-strain curves of the base metal,which will be convenient for the practical application of engineering

关键词： electron beam welding TC4-DT alloy joints limit load J-integral failure assessment line

Microstructure and Tribological Performances of 25NiCr-Cr_3C_2 Coatings Prepared by Laser-Hybrid Plasma Spraying technology

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 194-198页

作者： Li Shuqing1,2,Li Qilian2,gong Shuili2 1Department of materials Processing Engineering,School of materials Science & Engineering,Dalian university of technology,Dalian 116085,china 2National key laboratory of Science and technology on Power Beam Processes,beijing aeronautical Manufacturing technology Research institute,beijing 100024,china Dalian Univ Technol Sch Mat Sci & Engn Dept Mat Proc Engn Dalian 116085 Peoples R China beijing Aeronaut Mfg Technol Res Inst Natl Key Lab Sci & Technol Power Beam Proc Beijing 100024 Peoples R China

The 25NiCr-Cr3C2 coatings are deposited on 38CrMoAl substrate by air plasma spraying and laser-hybrid plasma spraying (LHPS) technologies,the coatings' microstructures and tribological performances were studied using an optical microscope,a scanning electron microscope,an X-ray diffraction,and an SRV high-temperature friction and wear *** the same time,the coating's bonding strength,microhardness are tested and *** test results indicate that the LHPS 25NiCr-Cr3C2 coating achieves metallurgy bonding and has higher bonding strength and higher microhardness than the air plasma spraying coating for the addition of the laser *** laser power makes the 25NiCr-Cr3C2 powders melt more sufficiently and has good fluidity and uniformity and therefore the LHPS 25NiCr-Cr3C2 coating's microstructures become more compact and there are no big cracks and cavities in *** the above changes,the LHPS 25NiCr-Cr3C2 coating has more excellent anti-high temperature abrasion performance and its friction coefficient is low and very stable,its main failure mechanism is a good combination of mild scratching and plastic deformation.

关键词： laser hybrid plasma spraying 25NiCr-Cr3C2 coating performance

Skin-inspired interface modification strategy toward a structurefunction integrated hybrid smart fabric system with self-powered sensing property for versatile applications

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8200-8208页

作者： Xiang cheng Teng Chen De gong Pengcheng Ma Bo Chen Jun Cai Aerospace Information Research institute Chinese Academy of SciencesBeijing 100190China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China beijing U-Precision Tech Co. Ltd.Beijing 100176China university of Chinese Academy of Sciences Beijing 100049China

Fabric-based composites with superior mechanical properties and excellent perceptive function are highly ***,it remains a huge challenge to attain structure-function integration,especially for hybrid fabric ***,a skin-inspired interface modification strategy is proposed toward this target by constructing a hybrid smart fabric system consisting of two types of smart fabrics:carbon nanotube(CNT)/MXene-modified aramid fabrics and zinc oxide nanorod(ZnO NR)-modified carbon *** on that,flexible piezoelectric pressure sensors with skin-like hierarchical perception interfaces are fabricated,which demonstrate superb sensitivity of 2.39 V·kPa^(-1)and are capable of various wearable monitoring ***,the interface-modified hybrid fabric reinforced plastics can also be fabricated,which are proven to possess 13.6%higher tensile strength,10.1%elastic *** impressively,their average energy absorption can be improved by 111.9%,accompanied with inherent damage alert *** offers a paradigm to fabricate structure-function integrated hybrid smart fabric composites for the smart clothing and intelligent aerial vehicles.

关键词： hybrid fabrics interface modification piezoelectric pressure sensors self-diagnostic composites structure-function integration