采用差示扫描量热法(DSC)、扫描电镜(SEM)和透射电镜(TEM)系统研究了Ni-Cr-W基高温合金二次M23C6的析出行为.结果表明,合金中二次M23C6的析出温度范围为648~1147℃,当温度高于1160℃时M23C6发生固溶;初生M6C在1349℃发生分解;合金在1400℃时完全熔化.由于时效温度不同,合金中析出两种不同形貌的M23C6.在较低温度时(655~900℃)粗大片层状M23C6在晶界析出;在900℃以上M23C6的形貌由片层状转变为不连续颗粒状.降温速率对M23C6的析出形貌产生一定影响;同时,降温过程中晶界上不连续颗粒状M23C6的析出是导致弯曲晶界形成的主要原因.
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