The morphology and orientation relationship between carbide precipitated at grain boundary and both side matrixes in nickel base alloy 690 aged at 715 ℃ for 2-200 h after solution treated were investigated by HRTEM, SEM and EBSD. The results show that the boundary carbide is easy to nucleate in the grain with high indexed crystal plane parallel to boundary, and the carbide has coherent orientation relationship (COR) with this grain. The carbide grows preferentially into the grain without COR between carbide and grain, which leads to lower chromium concentration in this side matrix near boundary. The asymmetry of chromium concentration profile leads to the different corrosion resistance of the two side grains nearby the grain boundary.
LI Hui
,
YAN Shuang
,
ZHOU Bang-Xin
,
PENG Jian-Tiao
. STUDY OF CARBIDE PRECIPITATION AT GRAIN BOUNDARY IN NICKEL BASE ALLOY 690[J]. Acta Metall Sin, 2011
, 47(7)
: 853
-858
.
DOI: 10.3724/SP.J.1037.2011.00197
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