EVOLUTION OF CARBIDE MORPHOLOGY PRECIPITATED AT GRAIN BOUNDARIES IN Ni–BASED ALLOY 690

Acta Metall Sin

2009, Vol. 45

Issue (2): 195-198 DOI:

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EVOLUTION OF CARBIDE MORPHOLOGY PRECIPITATED AT GRAIN BOUNDARIES IN Ni–BASED ALLOY 690

LI Hui; XIA Shuang; ZHOU Bangxin; NI Jiansen; CHEN Wenjue

Institute of Materials; Shanghai University; Shanghai 200072

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LI Hui XIA Shuang ZHOU Bangxin NI Jiansen CHEN Wenjue. EVOLUTION OF CARBIDE MORPHOLOGY PRECIPITATED AT GRAIN BOUNDARIES IN Ni–BASED ALLOY 690. Acta Metall Sin, 2009, 45(2): 195-198.

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Abstract

The effects of grain boundary characters on the morphology evolution of the intergranular carbide in Ni--based alloy 690 with high proportional
low ∑coincidence site lattice (CSL) boundaries aged at 715 ℃ for 2---200 h were investigated by SEM. The results show that the sizes of
intergranular carbides decrease with ∑value decreasing, and only fine carbides at coherent ∑3 are almost not changed after aging for 200 h. Plate--like carbides precipitated near both incoherent ∑3 and ∑9 boundaries, and the carbide plates grow bigger with the aging time prolonging, in which the former precipitated near both sides of incoherent ∑3 boundary and the latter precipitated near only one side of ∑9 boundary. The morphology of carbide precipitated at ∑27 boundary is similar to that precipitated at the general high angle grain boundary, and no plate--like carbides are observed near these boundaries.

Key words: carbide grain boundary character alloy 690 heat treatment

Received: 14 July 2008

ZTFLH:

TG113.1

Fund:

Supported by National Basic Research Program of China (No.2006CB605001), Innovation Fund of Shanghai University (Nos.A16–0110–08–006 and A10–0110–08–004)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I2/195

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