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采用断口的萃取碳复型等实验技术,发现NiCrWTi铸造高温合金在1030℃就存在着MC向M_(23)C_6的退化反应,而在1180℃出现M_(23)C_6向MC的逆反应。晶界的这种可逆反应十分明显。
The experimental results show that the NiCrWTi cast superalloy degenerates from MC to M_ (23) C_6 at 1030 ℃ and the reverse reaction of M_ (23) C_6 to MC at 1180 ℃. This reversal of grain boundary reaction is very obvious.