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9.30】Dr.Yuefeng GU
Topic1:The Present status...
        Dr.Masahiko DEMURA
Topic2:Development of thin...
 
2010-09-10 | 文章来源:高温合金研究部        【 】【打印】【关闭

Topic 1:The Present status of superslloys for turbine disk and the development of new disk superalloys in Japan

Speaker: Dr.Yuefeng GU, National Institute for Materials Science(NIMS), Japan

Time: 9:30am, (Thursday) Sept. 30, 2010

Topic 2:Development of thin foils of intermetallic Ni3Al: cold-rolling, recrystallization and "texture memory effect"

Speaker: Dr.Masahiko DEMURA, National Institute for Materials Science (NIMS), Japan

Time: 10:30am, (Thursday) Sept. 30, 2010

Venue:Room 403, R&D Building, IMR CAS 

Welcome to attend!

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The Present status of superslloys for turbine disk and the development of new disk superalloys in Japan

Yuefeng GU

High Strength Materials Group
  High Temperature Materials Center
  National Institute for Materials Science (NIMS)
  1-2-1 Sengen, Tsukuba Science City, Ibaraki 305-0047
  Japan

Nickel-base superalloys are high performance materials subject to severe operating conditions in the high temperature turbine section of gas turbine engines. Turbine blades in modern engines are fabricated from Ni-base alloy single crystals which are strengthened by ordered g' precipitates. Turbine disks are made from polycrystalline Ni-base alloys because these components have higher strength requirements (due to higher stresses). By increasing the upper temperature limit for the next generation of disk materials, the aviation industry will see significant environmental as well as cost benefits.

Researchers in the High Temperature Materials Center of the National Institute of Materials Science of Japan have recently completed their work on a new kind of disk alloys. The new disk alloys, a kind of nickel-coble-base superalloys processed by a normal cast and wrought (C&W) route, can withstand temperatures in excess of 725 degree centigrade, a 50-degree increase over C&W disks currently in operation.

In this presentation, we show the design idea, workability and properties of these Ni-Co-base superalloys. Furthermore, the evaluation of the processing and microstructure on a full-scale processing of Ni-Co-base superalloy turbine disk are described, which demonstrated the advantages and possibility of the Ni-Co-base disc alloys at the component level.

 

Development of thin foils of intermetallic Ni3Al: cold-rolling, recrystallization and "texture memory effect"

Masahiko Demura (DEMURA.Masahiko@nims.go.jp)

National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

Intermetallic Ni3Al has excellent high-temperature properties such as strength and oxidation/corrosion resistance. Very recently, we have found its catalytic properties for hydrogen production reactions, e.g. methanol decomposition and methane steam reforming.

Based on this multi-functionality, we have developed thin foils of intermetallics Ni3Al for use as both container and catalysts in high-temperature micro chemical reactors for hydrogen production. In this talk, I will focus on the texture and microstructure control of the Ni3Al foils, which control is essential to improve formability of them.

Ni3Al foils are fabricated by heavy cold rolling of the single crystals which are grown by investment casting technique. The cold-rolled foils have strong {110} texture with a relatively homogeneous microstructure. When the foils are heat-treated, recrystallization occurs and the texture changes from the cold-rolled one to a complicated one with several components other than that in the cold-rolled texture. With the subsequent grain growth, the complicated texture completely returns to the original {110} texture. That is, there are two stage in the texture evolution, disintegration by the recrystallization and reintegration by the subsequent grain growth. This phenomenon can be denoted as texture memory effect. I will discuss the mechanism of the texture memory effect based on the detailed analysis by SEM-EBSD method.

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