EFFECTS OF ADDITIONAL ELEMENTS ON THE EVOLUTION OF SECOND PHASES IN 9-12％ Cr STEEL AND RESULTING MECHANICAL PROPERTIES
Investigated in this study are precipitate evolution with and without addition of W, Co, and B in two kinds of 9-12％ Cr steels (named as A and B) used for power plants after various aging time and temperature using OM, SEM, TEM, etc. Three kinds of precipitates (Cr-rich M23C6, Nb-rich and V-rich MX, W-rich and Mo-rich Laves phase) were observed and investigated in the two alloys. Upon aging, the area fraction of M23C6 increased whereas that of Laves phases decreased despite of increase in size. The area fraction of W-rich Laves phase was much higher than that of Mo-rich Laves phase, indicating that W addition, compared to that of Mo addition, is more powerful in the formation of Laves phase precipitation (specimen A). The martensitic microstructure of specimen B was more stable than that of specimen A due to the addition of cobalt and boron. The tensile test and impact test were measured and studied in relation to the long term aging effect.
9-12 Cr aging microstructural evolution precipitates mechanical properties
JILING DONG HUI YU DAE-HWANG YOO QUOCBAO HUYNH KEESAM SHIN MINSOO KIM SUNGTAE KANG
School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea Doosan Heavy Industries and Construction Co.Ltd., Corporate R&D Institute, Changwon, Korea
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1141-1147
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）