K465合金在冷热循环过程中碳化物的析出行为  

Precipitation Behaviour of Carbides in K465 Alloy during the Alternate Heating/Cooling Cycles

作　　者：杨金侠[1] 郑启[1] 孙晓峰[1] 张承忠[1] 管恒荣[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2007年第1期42-45,共4页Rare Metal Materials and Engineering

摘　　要：研究了K465高温合金在850℃?20℃,950℃?20℃,1000℃?20℃和1050℃?20℃冷热循环过程中碳化物的析出情况。在850℃?20℃冷热循环过程中,没有发现析出型碳化物;在950℃?20℃冷热循环过程中,在枝晶间析出了M6C碳化物;在1000℃?20℃和1050℃?20℃冷热循环过程中,在枝晶间和枝晶干同时析出了方块状、短杆状、颗粒状和针状M6C碳化物。与等温热处理相比,冷热循环作用明显促进M6C碳化物的析出。此外,提高冷热循环的上限温度加速M6C碳化物的析出。K465 superalloy was investigated in 850℃←→20℃, 950℃←→20℃, 1000 ℃←→20℃ and 1050℃←→20 ℃ cycles. During 850℃←→20 ℃ cycles, the precipitated M6C type carbides were not observed. During 950℃←→20℃ cycles, M6C type carbides were precipitated in interdendritic region. During 1000℃←→20℃ cycles and 1050℃←→20℃ cycles, blocky, clubbed, acicular M6C type carbides were precipitated in interdendritic region and dendritic arm. In contrast to isothermal heat treatment, the heating/cooling cycles promoted precipitation of M6C type carbides. In addition, the increase of peak temperatures accelerated precipitation of M6C type carbides.

关 键 词：高温合金K465 碳化物 冷热循环 

分 类 号：TG115[金属学及工艺—物理冶金]