期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 145, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.106077
关键词
Rene 88DT nickel-base superalloy; Coherent twin boundary; Carbide precipitation; Bulk and pipe diffusion; Microscopic fatigue shear band; Persistent slip band
资金
- GE Global Research, AFOSR/AFRL [FA9550-12-1-0445]
- Air Force Center of Excellence [FA9550-12-1-0445]
- US Department of Energy Basic Energy Sciences [DE-SC0018901]
- Office of Naval Research [N00014-18-1-2858]
- NRL under ONR
- U.S. Department of Energy (DOE) [DE-SC0018901] Funding Source: U.S. Department of Energy (DOE)
Fatigue crack initiation at high temperatures in polycrystalline nickel-base superalloys occurs at microscopic fatigue shear bands near twin boundaries with minimal metallurgical defects. Formation of fine-scale carbide precipitates along these fatigue shear bands during fatigue above 650 degrees C is observed, with pipe diffusion critical to their formation coincident with delocalization of slip during fatigue.
Fatigue crack initiation at high temperatures occurs at microscopic fatigue shear bands that form near twin boundaries in polycrystalline nickel-base superalloys that contain minimal metallurgical defects. The associated dislocation sub-structure is complex and dependent on thermal and mechanical conditions. Here we show the formation of fine-scale carbide precipitates along these fatigue shear bands in a nickel-base superalloy during fatigue above 650 degrees C. The formation of carbide precipitates is studied using calculations of bulk and pipe diffusion. The contribution of pipe diffusion is observed to be critical in the formation of fine-scale carbides and occurs coincident with the delocalization of slip during fatigue.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据