Evolution of Carbides and Their Effects in Single Crystal Superalloy

LIU Li-rong; JIN Tao; SUN Xiaofeng; GUAN Heng-rong; HU Zhuang-qi

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Journal of Aeronautical Materials ›› 2007, Vol. 27 ›› Issue (5) : 12-16.

Evolution of Carbides and Their Effects in Single Crystal Superalloy

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Abstract

Transformation mechanism of carbides and their effect on the stress rupture property were investigated in a Ni-base single crystal superalloy with microcontent of carbon.The results are as follows: a little carbon MC carbide forms in interdendritic region in the alloy with 0.015% carbon.During the heat treatment and stress rupture tests,part of MC carbide transforms into M6C carbide.Secondary M6C carbides precipitate from γ matrix during higher temperature stress rupture tests and M23C6 during lower temperature stress rupture tests.Two type of secondary carbide precipitate can be acted as obstacles to block the dislocations motion.Compared with the base alloy,the stress rupture properties of alloy B with 0.015%carbon are improved.

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single crystal super / carbide / stress rupture prope

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LIU Li-rong, JIN Tao, SUN Xiaofeng, GUAN Heng-rong, HU Zhuang-qi. Evolution of Carbides and Their Effects in Single Crystal Superalloy[J]. Journal of Aeronautical Materials, 2007, 27(5): 12-16

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