Microstructure Evolution of a Single Crystal Nickel-Base Superalloy During Heat Treatment and Creep
来源期刊：材料热处理学报2004年第5期
论文作者：GUAN Heng-rong SUN Xiao-feng WANG Zhi-hui ZHAO Nai-ren YANG Da-yun JIN Tao HU Zhuang-qi
关键词：nickel-base single crystal; superalloy; microstructure; heat treatment; tensile creep;
摘 要：Microstructure evolution of a single crystal nickel-base superalloy during heat treatment and tensile creep at1010℃ and 248 MPa for 30h was observed and analyzed. Internal stresses because of lattice mismatch between γ and γphase provided the driving force for γ shape evolution during heat treatment. More than 65 vol. % distorted cubic γ phase keeping coherency with the γ matrix precipitated after solution at 1295 ℃ for 32h. The shape of γ phase was perfectly cubic with increasing precipitate size during the two-step aging treatment. Due to the applied stress and internal stress field the continuous γ-γ lamellar structure perpendicular to the applied stress was formed after 30h tensile creep.
GUAN Heng-rong1，SUN Xiao-feng1，WANG Zhi-hui1，ZHAO Nai-ren1，YANG Da-yun JIN Tao1，HU Zhuang-qi1
(1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China)
摘要:Microstructure evolution of a single crystal nickel-base superalloy during heat treatment and tensile creep at1010℃ and 248 MPa for 30h was observed and analyzed. Internal stresses because of lattice mismatch between γ and γphase provided the driving force for γ shape evolution during heat treatment. More than 65 vol. % distorted cubic γ phase keeping coherency with the γ matrix precipitated after solution at 1295 ℃ for 32h. The shape of γ phase was perfectly cubic with increasing precipitate size during the two-step aging treatment. Due to the applied stress and internal stress field the continuous γ-γ lamellar structure perpendicular to the applied stress was formed after 30h tensile creep.
关键词:nickel-base single crystal; superalloy; microstructure; heat treatment; tensile creep;
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