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Effect of long term aging on microstructure and stress rupture properties of a nickel based single crystal superalloy

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Progress in Natural science:materials International 2012年第5期22卷 426-432页

作者： Zhenxue Shi,Jiarong Li,Shizhong Liu science and technology on advanced {3. temperature structural materials laboratory,beijing institute of aeronautical materials,beijing 100095,{13. science and technology on advanced {3. temperature structural materials laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China

A nickel based single crystal superalloy with [001] orientation was prepared by the screw selecting method in the directionally solidified *** long term aging(LTA) of the alloy after full heat treatment was performed at 1040℃ for 200-800 *** microstructure and stress rupture properties at 980℃/250 MPa and 1070℃/140 MPa of the alloy long term aged(LTAed) for different time were *** coarsening γ’ phase and the broadening g matrix channel are observed in the samples LTAed at 1040℃,but the γ’ morphology is still in cubic shape after LTA for 800 *** TCP phase precipitates after LTA for 400 h,while needle shaped and granular TCP phase forms in dendritic core of the alloy after LTA for 600 *** increasing aging time,the volume of the TCP phase increases and it grows from the dendritic core to the interdendritic region along a fixed *** composition of the TCP phase is mainly composed of Re and *** increasing aging time the rupture life of the alloy at 980℃/250 MPa and 1070℃/140 MPa all turns ***,the relationship between the microstructure and the stress rupture properties is discussed.

关键词： Single crystal superalloy Long term aging(LTA) Microstructure Stress rupture properties

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

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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 {3.,University of science and technology beijing, beijing 100083.china 2.National Center for {3. Service Safety,University of science and technology beijing,beijing 100083.china 3.National key laboratory of science and technology on advanced high temperature structural {3., beijing institute of aeronautical materials,beijing 100095,china State key laboratory for advanced Metals and {3. University of Science and Technology Beijing Beijing 100083 China National Center for materials Service Safety University of Science and Technology Beijing Beijing 100083 China National key laboratory of science and {3. on advanced high temperature structural materials Beijing Institute of Aeronautical Materials Beijing 100095 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

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,{3., P.O. Box 81-3. beijing 100095, china Bangsheng LI School of materials science and Engineering, Harbin institute of Tech Natl. key Lab. of Adv. Composites Beijing Inst. of Aeronaut. Mater. P.O. Box 81-3 Beijing 100095 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 Y2O3.l2O3.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

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 {3. 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 National key laboratory of science and {3. on advanced high temperature structural materials Beijing Institute of Aeronautical Materials Beijing 100095 China 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-3.l-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-Nb5Si3.ndβ-*** 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-{3. 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

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

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

The Properties of Solution Precursor Plasma Spray Nanostructured Thermal Barrier Coatings

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 {3. 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 103.℃/161 *** best creep lives can be obtained with 149℃/min cooling rate specimens at 760℃/786 *** 982℃/210 MPa and 103.℃/161 MPa,a cooling rate of 3.℃/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

来源： cnki会议评论

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Journal of Wuhan University of technology(materials science) 2010年第6期25卷 924-928页

作者：闵捷 State key laboratory of advanced {3. for materials Synthesis and Processing Wuhan University of Technology

About 3.0 μm thickness uniform thermal barrier coatings （TBCs） were deposited on the 1Cr18Ni9Ti samples by solution precursor plasma spray （SPPS）.The analysis methods,such as TEM,SEM,and XRD were used to characterize the coatings in the aspects of microstructure and phase *** samples were quenched from 1121 ℃ to room temperature by forced-air to measure the thermal cycling *** density were measured by means of water *** experimental results show that grain size of the SPPS TBCs is about 3. nm with desired tetragonal phase ZrO2,and the SPPS TBCs（with 16% porosity） consist of arcuate pores,gelatin and melted *** hardness of the coatings is HR45Y3..5 and bond strength between coatings and substrates is 24.2 *** thermal shock test show the coatings have a average life of 500 cycles which is about 2.5 times than that of conventional air plasma spray （APS） TBCs.

关键词： SPPS TBCs nanostructure properties

STRAIN　INDUCED　structural　TRANSITION　OF　INTERFACES　AND　TWINS　IN　A　HOT－DEFORMED　DUAL－PHASE　TIAL　ALLOY

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 273-286页

作者： CHEN GuoFiang WANG Jinguo ZHANG Lichun and YE Hengqiang(State key laboratory for advanced Metals and {3., University of science and technology beijing, beijing, 100083. P. R. china laboratory of Atomic Imaging of Solids, institute of Metal Researc beijing Univ of science and Technology Beijing China

The structure characteristics of a2/γinterfaces and the features of deformation twins in a quasi-isothermal forged Ti-45Al-10Nb alloy were studied by highresolution transmission electron microscopy. Three types of strain induced a2/γinterfaces and two types of strain induced twin boundaries were identified The most,important features are high density of ledges and the existence of I/3.111] Frank partial dislocation. Mechanisms for the formation these interfaces were proposed Two types of deformation twins were observed These deformation twins always start from the ledges it seems that ledges at interfaces are important features of interfacial structure for the mechanical behavior of alloys.

关键词： strain induced structural transition interfacial structure,deformation twins intermetallic TiAl alloy HREM

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 {3. on Power Beam Processes,beijing aeronautical Manufacturing {3. Research institute,beijing 100024,china 2State key laboratory of Powder Metallurgy,Central South University,Changsha 410083.china 3.tate key laboratory of advanced {3. for materials Synthesis and Processing,Wuhan University of {3.,Wuhan 43.063. 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

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 {3.,Dalian 116023.china 2institute for structural Analysis of Aerocraft,Shenyang institute of aeronautical Engineering,Shenyang 11013.,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 China institute for structural Analysis of Aerocraft Shenyang Institute of Aeronautical Engineering Shenyang China College of science Institute of Dalian Nationalities Dalian 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