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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Temperature dependence of deformation mechanism in single crystal Ni-base superalloy
ZHANG Xuan(张 炫), JIN Tao(金 涛), ZHAO Nai-ren(赵乃仁), 
WANG Zhi-hui(王志辉), SUN Xiao-feng(孙晓峰), 
GUAN Heng-rong(管恒荣), HU Zhuang-qi(胡壮麒)

Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract: The tensile behavior of a new single crystal Ni-base superalloy was studied at various temperatures. Specimens were strained to fracture in the temperature range from 20℃ to 1000℃. σ0.2 is essentially unaffected by temperatures between 20℃ and 400℃. At higher temperatures it increases until it reaches a maximum at about 800℃. Beyond 800℃ a sharp decrease of strength is observed. There is a slight fluctuation in ductility between 20℃ and 800℃. The elongation to fracture increases from 10% to 36% as the temperature increases from 800℃ to 1000℃. The deformation is dominated by γ′ shearing and the high-density dislocations are observed in matrix channels at low temperatures. The dislocation microstructure is inhomogeneous due to the formation of dislocation concentrations with high-density tangling at intermediate temperatures. The networks deposited at the γ/γ′ interfaces prevent dislocations from entering the γ′ precipitates at high temperatures.

 

Key words: single crystal; Ni-base superalloy; tensile; microstructure; dislocation

ISSN 1672-7029
CN 43-1423/U

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