Effect of pre-compression on the stress rupture properties of single crystal superalloy：Ⅰmicrostructure and stress rupture properties of pre-compressed samples

Acta Metall Sin

2006, Vol. 42

Issue (8): 843-849 DOI:

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Effect of pre-compression on the stress rupture properties of single crystal superalloy：Ⅰmicrostructure and stress rupture properties of pre-compressed samples

中科院金属研究所

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. Effect of pre-compression on the stress rupture properties of single crystal superalloy：Ⅰmicrostructure and stress rupture properties of pre-compressed samples. Acta Metall Sin, 2006, 42(8): 843-849 .

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Abstract The effect of uniaxial pre-compression on the microstructure and stress rupture properties of an second generation single crystal superalloy without Re is studied. The pre-compression is performed in vacuum at 1050℃ by 180MPa/6h and 220MPa/6h respectively. It is shown that P type γ’ paralleling to stress is formed during pre-compression, which is more regular in the 220MPa compressed sample. Moreover, dislocation networks are deposited on γ/γ’ interface in vertical channels, while a few dislocations have cut into γ’ particles in 220MPa compressed sample. The effect on stress rupture lifetime vary with the test conditions, but pre-compression increased the elongations under all test conditions.

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Received: 21 November 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I8/843

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