长期时效对GH4169合金组织演化及低周疲劳行为的影响*
录用日期: 2015-01-20
网络出版日期: 2015-05-06
基金资助
* 国家高技术研究发展计划项目2012AA03A513和教育部资助技术项目625010337资助
INFLUENCES OF LONG-TERM AGING ON MICRO- STRUCTURE EVOLUTION AND LOW CYCLE FATIGUE BEHAVIOR OF GH4169 ALLOY
Accepted date: 2015-01-20
Online published: 2015-05-06
Supported by
Supported by High Technology Research and Development Program of China (No.2012AA03-A513) and Ministry of Education Technical Foundation (No.625010337)
安金岚,王磊,刘杨,胥国华,赵光普 . 长期时效对GH4169合金组织演化及低周疲劳行为的影响*[J]. 金属学报, 2015 , 51(7) : 835 -843 . DOI: 10.11900/0412.1961.2014.00626
GH4169 superalloy is one kind of important metallic materials used for manufacturing turbine discs in aero-engine. In order to meet the demand of higher strength, high ratio alloying elements have to be added, resulting in the complex microstructure evolution during the long-term service at elevated temperature. Furthermore, the turbine disc usually bears overloading which will lead to the low cycle fatigue (LCF) damage in real working and result in fatal security problem. Besides, it is meaningful to decide the relationship between the microstructure evolution and performance degradation. In the present work, microstructure evolution and LCF behavior of GH4169 alloy during long-term aging were investigated. The microstructure evolutions of GH4169 alloy during long-term aging at 750 ℃ for 500, 1000, 1500 and 2000 h and the influences of long-term aging on the LCF behavior were investigated. The results show that the size of g″ phases increases and the volume fraction decreases with the increase of aging time, compared with the increase of both size and volume fraction of d phases. Both the fatigue strength and fatigue life of the alloy decrease with the increase of aging time. For the specimen aged for the same time, the cyclic stress firstly contributes to cyclic hardening, then cyclic stability, and finally cyclic softening with the increase of cyclic numbers. It is found that the decrease of cyclic stress contribution is slightly effected by the size of g″ phases increase and volume fraction decrease after long-term aging. Therefore, the LCF life of the alloy decreases since the crack easily propagates along with the long needle-like d phases and the g″ phases precipitate free zones.
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