MECHANISM OF SECONDARY M_(23)C_6 PRECIPITATION AROUND MC IN A COBALT-BASE SUPERALLOY

金属学报(英文版), 1999, 12(2): 155-159.

MECHANISM OF SECONDARY M_(23)C_6 PRECIPITATION AROUND MC IN A COBALT-BASE SUPERALLOY

W.H. Jiang , X.D. Yao , H.R. Guan and Z.Q. Hu(1) Department of Superalloys , Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China2) Department of Metal Materials Engineering , Shenyang Polytechnic University) Shenyang 110023 , China )Manuscript received in revised form 11 September 1998

Keywords： cobalt-base superalloy , null , null , null

Secondary M23C6 precipitation around primary MC carbide in a directionally solidified cobalt-base saperalloy was investigated duriny aging at 850℃. The results show that it was closely related to the decomposition of the MC. Two mechanisms were suggested,i.e. the in situ reaction, MC+γ→M23C6+C, and the direct reaction, M+C→M23C6,in which MC acted as a carbon source.

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