铸造2018，Vol.67Issue(3)：257-260,264,5.
高温长期时效对DD5单晶高温合金显微组织和持久性能的影响
Effect of Long-Term High Temperature Aging on Microstructure and Stress Rupture Properties of DD5 Single Crystal Superalloy
高强 1刘丽荣 1彭志江 2张明俊 2刘波3
作者信息
- 1. 沈阳工业大学材料科学与工程学院,辽宁沈阳110870
- 2. 中航动力精密铸造科技有限公司,辽宁沈阳110043
- 3. 铁岭县高级中学,辽宁铁岭112000
- 折叠
摘要
Abstract
The microstructural evolution and stress rupture properties of the second generation single crystal superalloy DD5 after long-term aging at 1 000℃and 1 100℃without stress was investigated.The results show that γ?phase still remains regular cubic distribution after aging at 1 000℃ for 200 h,but the size of γ?phase slightly increases; the γ' phase gradually connects and rafts after long-term aging for 500 h; the rafting microstructure is more perfect after aging for 1 000 h.Compared with the microstructure at 1 000℃,the γ'phase coarsens and rafts more significantly at 1 100℃.The blocky M6C carbides and granular M23C6carbides precipitate during long-term aging.The μ phase precipitates in the form of needles and granules when aged at 1 000℃ for 100 h or at 1 100℃ for 200 h,the μ phase gradually increases with the aging time prolonging at 1 000℃.The amount of μ phase precipitated at 1 100℃ is less than that at 1 000℃.The stress rupture properties decrease with the increase of aging time and temperature at 1 000℃and 1 100℃.关键词
单晶/DD5合金/长期时效/显微组织/持久性能Key words
single crystal/DD5 superalloy/long-term aging/microstructure/stress rupture properties分类
矿业与冶金引用本文复制引用
高强,刘丽荣,彭志江,张明俊,刘波..高温长期时效对DD5单晶高温合金显微组织和持久性能的影响[J].铸造,2018,67(3):257-260,264,5.
