K465合金在冷热循环过程中MC碳化物的转变  

Transformation of MC Type Carbide in K465 Alloy During Heating/Cooling Cycles

作　　者：许婷婷[1,2] 水丽[1] 杨金侠[2] 郑启[2] 孙晓峰[2] 管恒荣[2] 胡壮麒[2] 

机构地区：[1]沈阳理工大学,辽宁沈阳110168 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《铸造》2009年第12期1253-1255,共3页Foundry

摘　　要：通过850℃圮20℃,950℃圮20℃,1000℃圮20℃和1050℃圮20℃冷热循环实验,研究了K465高温合金在冷热交替作用下初生MC碳化物的转变情况。结果表明:在850℃圮20℃冷热循环过程中,一部分初生MC碳化物发生了蜕变;随着循环峰温的升高,初生MC碳化物转变加速;在1000℃圮20℃冷热循环40次后,初生MC碳化物转变基本结束。与等温热处理相比,冷热循环促进了初生MC碳化物的转变,使初生MC碳化物更加不稳定。K465 superalloy was investigated under heating/cooling alternate funetion in 850℃←→20℃,950℃←→20℃,1000℃←→20℃and 1050℃←→20℃ cycles. The results show that a small amount of MC type carbide decomposed into M6C type carbide in 850℃←→20℃ cycle; with the cycled peak temperature increased, MC type carbide decomposed into M6C type carbide more rapidly, and the transformation of MC type carbide into M6C type carbide was basically completed till 40 cycles in 1 000 ~C＋.20 ~C condition. In contrast to isothermal heat treatment, heating/cooling cycle promoted the transformation of MC type carbide into M6C type carbide so that MC type carbide became unstable.

关 键 词：碳化物 高温合金K465 冷热循环 

分 类 号：TG132.32[一般工业技术—材料科学与工程]