高温合金IN792组织与持久性能稳定性研究  

Stability of Microstructure and Stress-rupture Properties of IN792 Superalloy

作　　者：杨金侠[1] 郑启[1] 孙晓峰[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》2012年第6期1038-1040,共3页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划项目(2010CB631200;2010CB631206)资助

摘　　要：研究了700和900℃时效高温合金IN792组织的演变规律和持久寿命的变化情况。700℃时,随着时效时间延长,γ′和碳化物的形貌、尺寸与分布没有发生变化;持久寿命保持稳定。900℃时,时间延长,γ′发生粗化,并形成条状;且在1007h之后,条状γ′的形态基本不变;但时效到2014h时析出少量的针状TCP相;与热处理状态相比(61h),时效500h时持久寿命下降到30h,降低50%左右;时效到1007h之后,直至2014h,持久寿命不再随时间延长而变化。The evolutions of microstructure and stress-rupture properties were investigated during aging at 700 and 900 ℃. With the increase of aging time at 700 ℃, the morphology, the size and the distribution of γ′ and carbides did not change, and the stress-rupture time was stable. During aging at 900 ℃,γ′ was coarsened to be worm-shaped. The worm-shaped microstructure was stable from 1007 h to 2014 h. The needle-like TCP phase was precipitated when the alloy was aged for 2014 h, but its content was very small. The stress-rupture time was only 30 h when the alloy was aged for 500 h. It was shortened by 50% in contrast to heat treated state. The stress-rupture time did not change from 1007 h to 2014 h.

关 键 词：高温合金 γ′ 碳化物 持久寿命 

分 类 号：TG132.32[一般工业技术—材料科学与工程]