ANISOTROPIC CREEP IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY

Acta Metall Sin

2009, Vol. 45

Issue (11): 1364-1369 DOI:

论文

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ANISOTROPIC CREEP IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY

JIA Yuxian^1;2); JIN Tao¹⁾; LIU Jinlai¹⁾; SUN Xiaofeng¹⁾; HU Zhuangqi¹⁾;

1) Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2) School of Materials Science and Engineering; Shenyang Ligong University; Shenyang 110168

Cite this article:

JIA Yuxian JIN Tao LIU Jinlai SUN Xiaofeng HU Zhuangqi. ANISOTROPIC CREEP IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY. Acta Metall Sin, 2009, 45(11): 1364-1369.

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Abstract

Constant load creep tests were performed on the [001] and [011] oriented Ni-Co-Cr-Mo-W-Al-Ti-Ta single crystal superalloys. The [001] oriented alloy has much longer creep life than that of [011] oriented alloy, but the elongation of [011] oriented alloy is slightly higher under the condition of 750 ℃/750 MPa. The average creep life and elongation of [001] oriented alloy are both higher than that of [011] oriented alloy at 982 ℃/248 MPa, and the anisotropy occurs mainly during the accelerating creep stage, but anisotropic degree decreases obviously. The SEM analysis revealsγ ´phases are rafted in the two directions, which blocks the glide/climb of dislocations and causes creep hardening, the rafting of γ´ phase is the dominant reason to decrease of creep anisotropy at higher temperature. The TEM observation indicates deformation twins formed in [011] oriented alloy, which lowers the plasticity of the sample and induces the sample to fracture rapidly.

Key words: Ni-based single crystal superalloy creep anisotropy crystal orientation

Received: 18 March 2009

ZTFLH:

TG113.25

Fund:

Supported by National Natural Science Foundation of China (No.50931004)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I11/1364

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