MICROSTRUCTURES AND PROPERTIES OF DZ40M Co-BASED SUPERALLOY AFTER LONG-TERM AGEING AT850℃
来源期刊：中国有色金属学报(英文版)1998年第4期
论文作者：Jiang Wenhui Yao Xiangdong Guan Hengrong Hu Zhuangqi
文章页码：617 - 621
Key words：directional solidification ,Co-based superalloy ,long-term ageing ,mechanical property
Abstract: DZ40M is a newly developed directionally solidified Co-based superalloy. Its microstructural characteristics and mechanical properties at room and elevated temperatures after ageing for 100~1 000 h at 850℃were studied. The results showed that 100h ageing at 850℃results in a substantial increase of tensile strength at room temperature and stress-rupture life at elevated temperatures, serious decrease of ductility at room temperature and improvement for stress-rupture ductility. With increasing ageing time, stress-rupture life tends to decrease and the other properties keep at essential constant. During ageing, primary carbides M7C3and MC decompose sluggishly, fine M23C6precipitates copiously around them and M6C forms on the sur- face of some M7C3. The increased strength of the aged alloy is attributed to a strong interaction between M23C6and dislocations.
