日本金属学会誌

J. Japan Inst. Metals, Vol. 57, No. 1 (1993),
pp. 14-20

Effect of Three-dimensional Shape of Secondary Recrystallized Grains on Creep Rates at High Temperatures in Powder Metallurgy Tungsten Wires

Koji Tanoue1, Hiroshi Sakurai1, Koji Fujii2 and Hidehiko Matsuda1

1Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu
2Nippon Tungsten Co., Ltd., Fukuoka

Abstract:

Some parameters characteristic of the configuration of secondary recrystallized grains grown in powder metallurgy tungsten wires are defined after making clear their contours three-dimensionally. The change in shape of the grains increases with an increase in heating rate and a decrease in annealing temperature, the trend of which is more clearly revealed in non-doped tungsten wire. The parameters reliably reflect such a change in the three-dimensional shape of various grains. It is then investigated through the parameters how the grain configuration influences the steady state creep rate. The effect of grain configuration to suppress creep rates can be confirmed only when the area of grain boundary is not largely changed.


(Received May 28, 1992)

Keywords:

grain configuration, secondary recrystallized grain, creep, high temperature, wire, powder metallurgy, tungsten


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