用SEM研究了含有高比例低∑重位点阵 (CSL)晶界的镍基690合金在715℃时效过程中不同类型晶界上碳化物的形貌演化. 结果表明: 低∑CSL晶界与一般大角晶界上碳化物的形貌演化特征有明显区别.晶界上的碳化物粒子尺寸随∑值降低而减小, 共格∑3晶界上的小尺寸碳化物在长时间时效后无明显变化; 非共格∑3晶界和∑9晶界附近都观察到板条状碳化物, 并随时效时间延长明显长大, 非共 格∑3晶界两侧都存在碳化物板条, 而∑9晶界上的碳化物板条只在晶界一侧生长; ∑27晶界与一般大角晶界处的碳化物形貌相似, 在晶界附近未观察到板条状碳化物.
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.
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