Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988385 | Intermetallics | 2018 | 8 Pages |
Abstract
Newly designed Ti-47Al-6Nb-0.1C at.% alloy was directionally solidified by cold crucible under 45â¯kWâ¯at the growth rate of 5-16.67â¯Î¼m/s. The macro/microstructure evolution, room-temperature tensile property and creep behavior are investigated. The results show that this alloy was well directionally solidified by cold crucible at the growth rate of 5-11.67â¯Î¼m/s, and they display primary β solidification at this growth-rate range. It is also found that the lamellar spacing is mainly controlled by growth rate, and the lamellar spacing decreases with the increasing of growth rate according to relationship d=1751Vâ0.58. Moreover, the extent of microsegregation increases with the increasing of growth rate, and thus the effect of microsegregation on creep behavior is discussed. After controlling directional solidification process at growth rate of 5-8.33â¯Î¼m/s, this alloy exhibits good creep properties with creep life more than 800â¯hâ¯at 800â¯Â°C/200â¯MPa, and the acceptable room-temperature tensile property with yield strength 436-452â¯MPa and elongation 1.62-1.68%.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Qi Wang, Ruirun Chen, Xue Gong, Jingjie Guo, Yanqing Su, Hongsheng Ding, Hengzhi Fu,