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

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 Univ Sci & Technol beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China Univ Sci & Technol beijing Natl Ctr Mat Serv Safety Beijing 100083 Peoples R China beijing Inst Aeronaut Mat Natl Key Lab Sci & Technol Adv High Temp Struct M Beijing 100095 Peoples R China

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

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Solidification Simulation of Investment Castings of Single Crystal Hollow Turbine Blade

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Journal of materials science & technology 2003年第6期19卷 532-534页

作者： Jiarong LI, Shizhong LIU, Hailong YUAN and Zhengang ZHONGnational key laboratory of advanced high temperature structural materials, beijing institute of aeronautical materials, beijing 100095, china Lab. of Adv. high Temp. Mat. Beijing Inst. of Aero. Mat. Beijing 100095 China

The three-dimensional solidification simulation of the investment castings of single crystal hollow turbine blade at the withdrawal rates of 2 mm/min, 4.5 mm/min and 7 mm/min has been performed with the finite element thermal analysis. The calculated results are in accordance with the experimental ones. The results show that with the increase of withdrawal rate the concave curvature of the liquidus isotherm is larger and larger, and the temperature gradients of the blades increase. No effects of withdrawal rate on the distribution of the temperature gradients of the starter and helical grain selector of the blades are observed at withdrawal rates of 2 mm/min, 4.5 mm/min and 7 mm/min. The relatively high temperature gradient between 500℃/cm and 1000℃/cm in the starter and helical grain selector is obtained at three withdrawal rates.

关键词： Single crystal Hollow turbine blade Solidification simulation

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Preparation of Silicon Carbide with high Properties

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Journal of materials science & technology 2001年第1期17卷 53-54页

作者： Guangiiang YUAN Yang ZHOU and Daming CHEN national key laboratory of advanced Composites, beijing institute of aeronautical materials, P.O. Box 81-3, beijing 100095, china Bangsheng LI School of materials science and Engineering, Harbin institute of Tech beijing Inst Aeronaut Mat Natl Key Lab Adv Composites Beijing 100095 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

In order to prepare silicon carbide with high properties, three kinds of SiC powders A, B, and C with different composition and two kinds of additives, which were Y2O3-A12O3 system and Y2O3-La2O3 system, were used in this experiment. The properties of hot-pressed SiC ceramics were measured. With the same additives, different SiC powder resulted in different properties. On the other hand, with the same SiC powder, increasing the amount of the additive Y2O3Al2O3 improved properties of SiC ceramics at room temperature, and increasing the amount of the additive Y2O3-La2O3 improved property SiC ceramics at elevated temperature. In addition. the microstructure of SiC ceramics was studied by scanning electron microscopy.

关键词： SiC Preparation of Silicon Carbide with high Properties

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Microstructures and mechanical properties of directionally solidified multi-element Nb-Si alloy

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Progress in Natural science:materials International 2011年第2期21卷 146-152页

作者： Qiang HUANG~(1,2),Xi-ping GUO~2,Yong-wang KANG~1,Jin-xia SONG~1,Shi-yu QU~1,Ya-fang HAN~1 1.national key laboratory of science and technology on advanced high temperature structural materials, beijing institute of aeronautical materials,beijing 100095,china 2.State key laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,china [a] national key laboratory of science and technology on advanced high temperature structural materials Beijing Institute of Aeronautical Materials Beijing 100095 China [b] State key laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

Nb-Si system in-situ composites with nominal composition of Nb-21Ti-16Si-7Cr-3Al-2Hf（mole fraction,%） were prepared by directional solidification technology in an optical floating zone furnace at the growth rates of 3,5,8 and 12 mm/*** microstructures and mechanical properties were investigated as a function of the growth *** results show that the solidification microstructures consist of Nb solid solution（Nbss）,α-Nb5Si3andβ-*** with high aspect ratio grow continuously and straightly when the growth rate is 5mm/h;lower or higher growth rates are disadvantageous for the formation of favorable directional *** compressive strength at 1 250℃and room-temperature fracture toughness of the specimen with the growth rate of 5 mm/h that exhibits excellent mechanical properties are 415 MPa and 22.4 MPa·m1/2,respectively.

关键词： Nb-Si system in-situ composite directional solidification microstructure mechanical property

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Effect of cooling rate after solution on microstructure and creep properties of single crystal superalloy DD3

Effect of cooling rate after solution on microstructure and ...

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第十一届国际材联亚洲材料大会

作者： LIU Weiwei and TANG Dingzhong national key laboratory of science and technology on advanced high temperature structural materials beijing institute of aeronautical materials beijing 100094 china

＜正＞The effect of different cooling rate on microstructure and creep properties of DD3 single crystal superalloy after solution treatment was investigated. 10°C/min cooling rate is adverse to the creep properties performed at all the conditions of 760℃/786 MPa,982℃/210 MPa and 1038℃/161 *** best creep lives can be obtained with 149℃/min cooling rate specimens at 760℃/786 *** 982℃/210 MPa and 1038℃/161 MPa,a cooling rate of 38℃/min shows the best creep properties in the four kinds of *** experimental results show that the size ofγ’ precipitates decreases with the increasing of cooling rate from 10℃/min to 149℃/*** the creep test,the directional coarsening ofγ’ precipitates occurred andγ’ rafting is formed.

关键词： DD3 single crystal superalloy cooling rate microstructure creep property

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Microstructure and Phase Stability of Plasma Sprayed Sc_2O_3-Y_2O_3-ZrO_2 TBCs

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稀有金属材料与工程 2011年第S4期40卷 151-154页

作者： Li Q L1,Liu H F1,2,Yang W H1,Li S Q1,Chen H J1,3.national key laboratory of science and technology on Power Beam Processes,beijing aeronautical Manufacturing technology Research institute,beijing 100024,china 2State key laboratory of Powder Metallurgy,Central South University,Changsha 410083,china 3State key laboratory of advanced technology for materials Synthesis and Processing,Wuhan University of technology,Wuhan 430063, china. beijing Aeronaut Mfg Technol Res Inst Natl Key Lab Sci & Technol Power Beam Proc Beijing 100024 Peoples R China Cent S Univ State Key Lab Powder Met Changsha 410083 Peoples R China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430063 Peoples R China

Scandia,yttria-stabilized zirconia (Sc2O3-Y2O3-ZrO2) powder for plasma spraying was synthesized by chemical co-precipitation *** morphology and phase stability of plasma sprayed 6.8mol%Sc2O3-1.2mol%Y2O3-ZrO2 thermal barrier coatings (TBCs) were *** of the coatings were heated at 1400℃ for 500 hours and then examined by X-ray *** was found that the Sc2O3-Y2O3-ZrO2 coatings showed excellent phase stability to retain single tetragonal t' phase structure and did not undergo a tetragonal-to-monoclinic phase transition upon cooling.

关键词： thermal barrier coatings Scandia yttria-stabilized zirconia microstructure phase stability

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Effects of long-term aging at 1070℃on microstructure of Ni3Al-base single-crystal alloy IC6SX

Effects of long-term aging at 1070℃on microstructure of Ni3...

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第十一届国际材联亚洲材料大会

作者： LI Ming~a,SONG Jinxia~a,LI Shusuo~b,and HAN Yafang~a a national key laboratory of advanced high temperature structural materials,beijing institute of aeronautical materials(BIAM),beijing 100095,china b School of materials science and Engineering,beijing University of Aeronautics & Astronautics,beijing 100191,china

The effects of long-term aging at 1070℃for periods of 100 h to 1500 h on microstructure of Ni

关键词： oxides IC6SX Ni3Al long-term aging microstructure

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Functions for patch test in finite element analysis of the Mindlin plate and the thin cylindrical shell

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science china(Physics,Mechanics & Astronomy) 2009年第5期52卷 762-767页

作者： CHEN WanJi 1,2 ,WANG JinZhi 1,3 &ZHAO Jie 1 1State key laboratory for structural Analysis of Industrial Equipment,Dalian University of technology,Dalian 116023,china 2institute for structural Analysis of Aerocraft,Shenyang institute of aeronautical Engineering,Shenyang 110136,china 3 College of science,institute of Dalian nationalities,Dalian 116022,china State key laboratory for structural Analysis of Industrial Equipment Dalian University of Technology Dalian 116023 China institute for structural Analysis of Aerocraft Shenyang Institute of Aeronautical Engineering Shenyang 110136 China College of science Institute of Dalian Nationalities Dalian 116022 China

Current patch test for Mindlin plate element only satisfies the zero shear deformation *** patch test of non-zero constant shear for Mindlin plate problem cannot be *** shell element, the patch test does not even *** on the theory of enhanced patch test proposed by Chen W J (2006),the authors proposed the enhanced patch test function for Mindlin plate and thin cylindrical shell *** enhanced patch test function can be used to assess the convergence of the Mindlin plate and cylindrical thin shell elements.

关键词： Mindlin plate thin cylindrical shell finite element enhanced patch test test function

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Gleeble experiments concerning dendrite re-melting and its role in microstructural evolution in spray formed high-alloy metals

Gleeble experiments concerning dendrite re-melting and its r...

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第十一届国际材联亚洲材料大会

作者： ZHANG Yong LIU Na LI Zhou ZHANG Guoqing YUAN Hua XU Wenyong GAO Zhengjiang and MI Jiawei a national key laboratory of science and technology on advanced high temperature structural materials beijing institute of aeronautical materials beijing 100095 china b Department of materials University of Oxford Parks Road Oxford 0X1 3PH UK

＜正＞An experimental approach was designed to understand dendrite fragmentation of atomized droplets deposition in spray materials,and to study the relationship between dendrite fragmentation behavior and subsequent microstructural evolution.A Gleeble 3500 physical simulator was used to create controlled thermal shock conditions in solid-liquid mixtures of Superalloy GH4169 and high Speed Steel（HSS）T15 atomised powders,which simulated the environment of droplet deposition during the spray forming of large diameter billets at beijing institute of aeronautical materials（BIAM）.The experiment results support that the rapid remelting and thermal shock play an important role in the development of the fine equiaxed microstructure in spray forming high-alloy metals.

关键词： Gleeble physical simulation dendrite fragmentation spray forming superalloy high Speed Steel(HSS)

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Transport Properties of LCMO Granular Films Deposited by the Pulsed Electron Deposition Technique

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Journal of Wuhan University of technology(materials science) 2011年第6期26卷 1027-1031页

作者：陈雷明 Zhengzhou institute of aeronautical Industry Management

By finely controlling the deposition parameters in the pulsed electron deposition process, granular La 2/3 Ca 1/3 MnO 3 （LCMO） film was grown on silicon substrates. The substrate temperature, ambient pressure in the deposition chamber and acceleration potential for the electron beam were all found to affect the grain size of the film, resulting in different morphologies of the samples. Transport properties of the obtained granular films, especially the magnetoresistance （MR）, were studied. Prominent low-field MR was observed in all samples, indicating the forming of grain boundaries in the sample. The low-field MR show great sensitive to the morphology evolution, which reaches the highest value of about 40% for the sample with the grain size of about 250 nm. More interestingly, positive-MR （p-MR） was also detected above 300 K when low magnetic field applying, whereas it disappeared with higher magnetic field applied up to 1.5 and 2 Tesla. Instead of the spin- polarized tunneling process being commonly regarded as a responsible reason, lattice mismatch between LCMO film and silicon substrate appears to be the origin of the p-MR

关键词： colossal magnetoresistance granular film transport properties

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