沈阳航空航天大学学报2026，Vol.43Issue(2)：49-55,7.DOI:10.3969/j.issn.2095-1248.2026.02.007
温度-应力耦合时效对GH4706合金组织及性能的影响
Effect of temperature-stress coupling aging on microstructure and mechanical properties of GH4706 alloy
摘要
Abstract
In order to deeply investigate the long-term aging thermal stability of the GH4706 alloy used for turbine discs,the microstructure and mechanical properties of GH4706 alloy were analyzed by OM and SEM as well as tensile,endurance and impact tests under temperature-stress coupling(650℃-300 MPa).The results show that the strength,plasticity,durability and impact toughness of GH4706 alloy decrease with the increase of aging time,regardless of single temperature field or temperature-stress coupling field.However,the rupture life of GH4706 alloy under temperature-stress coupling field is much higher than that under single temperature field after 3 000 h long-term aging.The reason is that the γ'phase in the alloy under single temperature field is coarsened and dissolved.γ'phase changed from a fine disk to a long strip,resulting in a decline in the intracrystalline strengthening.The η phase precipitates at the grain boundary in a short rod-like form at the initial stage,and then coarsened to a needle-like or lamellar shape with the increase of precipitation time,which will weaken the grain boundary.η phase precipitation is inhibited by temperature-stress coupling field,and the distribution of η phase is cellular in the grain boundary,which plays a strengthening role in the grain boundary and is conducive to improving the high temperature durability.关键词
GH4706合金/温度-应力耦合时效/组织演变/力学性能/η相Key words
GH4706 alloy/temperature-stress coupling aging/microstructure evolution/mechanical property/η phase分类
矿业与冶金引用本文复制引用
余志勇,侯翔益,徐烨玲,王冲,廉心桐..温度-应力耦合时效对GH4706合金组织及性能的影响[J].沈阳航空航天大学学报,2026,43(2):49-55,7.基金项目
国家重点研发计划项目(项目编号:2022YFB3705105,2022YFB3705104). （项目编号:2022YFB3705105,2022YFB3705104）
