Influence of Solution Treatment on Creep of a New Superalloy GH4169G

Chinese Journal of Materials Research

2013, Vol. 27

Issue (4): 444-448 DOI:

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Influence of Solution Treatment on Creep of a New Superalloy GH4169G

ZHENG Quying^1* CHEN Zhongqiang¹ YU Xingfu² XIN Xin² ZHANG Weihong² SUN Wenru²

1. AVIC Shenyang Liming Aero-Engine (Group) Corporation LTD., Shenyang 110043
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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ZHENG Quying* CHEN Zhongqiang YU Xingfu XIN Xin ZHANG Weihong SUN Wenru. Influence of Solution Treatment on Creep of a New Superalloy GH4169G. Chinese Journal of Materials Research, 2013, 27(4): 444-448.

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Abstract Effects of solution temperature on grain structure, grain boundary precipitation and creep behavior of GH4169G alloy have been investigated, and the creep mechanism and the reason for solution temperature influencing the creep of the alloy has been discussed. When the solution temperature is increased from 980℃ to 1020℃ the d phase precipitation at the grain boundaries markedly decreased, and the grain size largely increased, but the g″precipitation within the grain matrix is not influenced noticeably. In addition, the steady state creep rate at 650℃/700 MPa is greatly lowered, and the apparent activation energy is largely increased, and the creep rupture life is noticeably extended. It was determined through TEM observation that GH4169G alloy creeps mainly by twinning. The decreasing d phase precipitation helps to inhibit the creep through grain boundary slip, and the enlarged grain size naturally prohibits the twinning and hence mitigates the creep through grain deformation. As a result, the steady state creep rate of GH4169G alloy is decreased and the creep rupture life is extended.

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