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Effects of solidification parameters on microstructure and mechanical property of a Ni-based superalloy K35 blade

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Rare metals 2007年第S1期26卷 274-279页

作者： XUE Xiang,and XU Lin national key {2. for precision hot processing of metals,harbin institute of technology,harbin 150001,{12. harbin Inst Technol Natl Key Lab Precis Hot Proc Met Harbin 150001 Peoples R China

A gas turbine blade of Ni-based superalloy K35 was chosen as the test casting and the effects of solidification parameters on microstructure and mechanical property of the blade were investigated.A software package was used to numerically simulate the mold filling and solidification process of the blade casting in order to obtain the solidification parameters in the *** secondary dendrite arm spacing and grain size at different positions of the blade casting were *** relationships of secondary dendrite arm spacing and grain size versus cooling rate and solidification time were quantitatively *** relationships of Vickers-hardness versus solidification structures are also *** results show that Vickers-hardness decreases with the increase of both grain size and secondary dendrite arm *** offers a good basis to predict the microstructure and mechanical property of a gas turbine blade casting through numerical simulation in order to obtain a high-quality gas turbine blade casting.

关键词： superalloy microstructure dendrite arm spacing grain size hardness

Diffusion Bonding between TiAl Based Alloys and Steels

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Journal of Materials Science & technology 2001年第1期17卷 191-192页

作者： Wenbo HAN and Jiuhai ZHANG national key {2. of precision hot processing of metals, School of Materials Science and Engineering, harbin institute of technology, harbin 150001, china harbin Inst Technol Sch Mat Sci & Engn Natl Key Lab Precis Hot Proc Met Harbin 150001 Peoples R China

The joint of 40Cr steel and TiAl based alloy has been studied by means of a high frequency induction diffusion welder. The experimental results show that, the higher the temperature and pressure, the higher the streng... 详细信息

关键词： temperature and pressure optimum parameters TiAl based alloy high frequency strength of

Preparation of multi-walled carbon nanotube-reinforced TiNi matrix composites from elemental powders by spark plasma sintering

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Rare metals 2012年第1期31卷 48-50页

作者： CAI Wei,FENG Xue,and SUI Jiehe national key {2. precision hot processing of metals,School of Materials Science and Engineering,harbin institute of technology,harbin 150001,{12. national key {2. precision hot processing of metals School of Materials Science and Engineering Harbin Institute of Technology Harbin China

Carbon nanotube (CNT)-reinforced TiNi matrix composites were synthesized by spark plasma sintering (SPS) employing elemental *** phase structure,morphology and transformation behaviors were *** was found that thermoelastic martensitic transformation be-haviors could be observed from the samples sintered above 800 ℃ even with a short sintering time (5min),and the transformation tempera-tures gradually increased with increasing sintering temperature because of more Ti-rich TiNi phase *** decreasing the sin-tering temperature and time to 700 ℃ and 5min could not protect defective MWCNTs from reacting with Ti,still-perfect MWCNTs re-mained in the specimens sintered at 900 ℃.This method is expected to supply a basis for preparing CNT-reinforced TiNi composites.

关键词： metallic composites shape memory materials carbon nanotubes spark plasma sintering

Component Evaporation of Ti-15-3 Melt during ISM processing

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Journal of Materials Science & technology 2001年第1期17卷 83-84页

作者： Yanqing SU Jingjie GUO HongSheng DING Songqing LIU Yuan LIU GuiZhong LIU and Jun JIA national key {2. of precision hot processing of metals, harbin institute of technology, harbin 150001, china harbin Inst Technol Natl Key Lab Precis Hot Proc Met Harbin 150001 Peoples R China

How to control melt composition is the key for getting high quality alloy melt. The paper made the following efforts: (1) The activity coefficients in Ti-15-3 melt have been calculated. (2. Taking advantage of the activity coefficients, the evaporation losses of components in Ti-15-3 melt during ISM process have been studied. The calculated results show that there is a critical vacuum degree (about 1.33 Pa) during melting process.

关键词： activity coefficients evaporation losses melting process vacuum degree high quality ISM process alloy melt

A Research on Investment Casting technology of Ti Alloys

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Journal of Materials Science & technology 2000年第1期16卷 76-78页

作者： Huiguan WAN, Xiumei QI, Jing TIAN, Yuyong CHEN, Weiqiang ZHA and Jun JIA (national key {2. of precision hot processing of metals, harbin institute of technology, harbin 150001, china) national key {2. of precision hot processing of metals Harbin Institute of Technology Harbin 150001 China

In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.

关键词： In Ti A Research on Investment Casting technology of Ti Alloys

Microstructure Characteristic of In-situ Ti/TiC Composites

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Journal of Materials Science & technology 2001年第1期17卷 103-104页

作者： Bo YANG Beijing institute of Aeronauticul Materials, Beijing 100095, china Erlin ZHANG Yunxue JIN Zhaojun ZHU and Songyan ZENG {2. key Lab. of precision hot processing of metals, harbin institute of technology, harbin 150001, china Beijing Inst Aeronaut Mat Beijing 100095 Peoples R China harbin Inst Technol Natl Key Lab Precis Hot Proc Met Harbin 150001 Peoples R China

TiC reinforced titanium composites has been produced with different Al content and C content by XDTM. The results have shown that TiC particles are of two different morphologies f coarse dendritical primary TiC and short bar-shape eutectic TiC. Al content has great effects on the morphology of TiC. With the increasing of Al content, the morphology of primary TiC changes from coarse developed dendrite into short bar-shape or plate--shape TiC with 35%Al. Meanwhile, the structure of the matrix changes from single Ti to Ti and Ti3Al, and to Ti3Al and TiAl. However, the C content has no influence on the microstructure of matrix. When the C content is less than 1.2., the dendrite TiC disappears and only short bar-shape or plate-shape TiC exists in the composites. In addition, the effect of he3t treatment on the morphology of TiC has also Studied.

关键词： TiC Microstructure Characteristic of In-situ Ti/TiC Composites

Shape-predicted model of spray forming rod under scanning atomization

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Rare metals 2007年第S1期26卷 30-35页

作者： CAO Fuyang,WU Peilian,NING Zhiliang,ZHAO Wenjun,and SUN Jianfei key laboratory for Procession {2. processing of metals,harbin institute of technology,harbin 150001,china harbin Inst Technol Key Lab Proc Hot Proc Met Harbin 150001 Peoples R China

A model for simulating the spray forming process with scanning atomizer was *** for the scanning atomization and the deposition processes were coupled together in order to obtain a new description of the spray forming *** model,which is able to predict the shape of a spray-formed billet prepared with scanning atomizer,was established after analyzing the changes in droplet size and density distribution along the r-axis in the spray cone in scanning *** effects of the two kinds of atomization were compared,showing that the scanning atomization is good for deposition.

关键词： spray forming atomization modeling rapid solidification scanning atomization

Thermodynamic Analysis on Interaction between Molten Ti Alloys and Oxide Molding Materials

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Journal of Materials Science & technology 2001年第1期17卷 99-100页

作者： Hongsheng DING Jun JIA Jingiie GUO and Yanqing SU national key {2. of precision hot processing of metals, harbin 150001, china HengZhi FU and Jinshan LI State key {2. of Solidification processing, Northwestern Polytechnical University, Xi’ harbin Inst. of Technol. Harbin 150001 China

A thermodynamic model has been built up for the interactions between molten Ti alloys and oxide molding materials in the way of decomposition and solution of molding materials, then the influences on the reaction free... 详细信息

关键词： Ti Thermodynamic Analysis on Interaction between Molten Ti Alloys and Oxide Molding Materials

NUMERICAL SIMULATION OF ATOMIZATION GAS FIELDS IN VARIOUS ATOMIZING PROCESSES

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Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 279-284页

作者： F.Y. Cao, J.F. Sun, C.S. Cui, J. Shen and Q.C. Linational key {2. of precision hot processing of metals, harbin institute of technology, harbin 150001,chinaManuscript received 10 December 2.01 in revised form 31 January 2.02 national key {2. of precision hot processing of metals Harbin Institute of Technology

A Computational Fluid Dynamics Software was used to calculate the atomizing gas fields generated by a self-designed atomizer and to analyze the effects of key atomizing variables such as gas pressure and protrusion length of delivery tube on the gas flow state at the tip of or inside the delivery tube. Increasing the length of delivery tube to a certain extent, the eddy flow region with positive pressure moves away from the tip of delivery tube, which is favorable to achieve the effective atomization of the melt.

关键词： atomization computational fluid dynamics numerical simulation powder metallurgy