Research on Dynamic Recrystallization Behavior of Directionally Solidified DZ4 Superalloy

JIA Bo; LI Chun-guang; LI Yun-ju; TAO Chun-hu

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Journal of Aeronautical Materials ›› 2009, Vol. 29 ›› Issue (1) : 43-46.

Research on Dynamic Recrystallization Behavior of Directionally Solidified DZ4 Superalloy

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Abstract

Research on dynamic recrystallization behavior of directionally solidified DZ4 superalloy bearing static tensile stress at high temperature was carried out.How the factors affect dynamic recrystallization behavior of DZ4 superalloy,including temperature,stress and surface oxidation is mainly researched.The results show that dynamic recrystallization will occur in oxide layer at surface of DZ4 specimens without coating at 800℃ to 950℃ and the depth of recrystallization zone increases with the increase of temperature and stress.Analysis shows that surface oxidation is main reason for surface dynamic recrystallization.Experiment results also show that dynamic recrystallization won't occur at surface of DZ4 superalloy blades with protective Al-Si coating at normal working conditions.

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directionally solidi / dynamic recrystalliz / surface oxidation / Al-Si coating

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JIA Bo, LI Chun-guang, LI Yun-ju, TAO Chun-hu. Research on Dynamic Recrystallization Behavior of Directionally Solidified DZ4 Superalloy[J]. Journal of Aeronautical Materials, 2009, 29(1): 43-46

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