INFLUENCE OF CREEP-FATIGUE INTERACTION ON HIGH-TEMPERATURE FATIGUE-CRACK GROWTH-BEHAVIOR OF TI-1100

被引：12
作者：
ROSENBERGER, AH
GHONEM, H
机构：
[1] Mechanics of Solids Laboratory, Department of Mechanical Engineering, University of Rhode Island, Kingston, Rhode Island
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1994年 / 17卷 / 04期
关键词：
D O I：
10.1111/j.1460-2695.1994.tb00240.x
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A series of crack growth experiments has been preformed on the near alpha titanium alloy, Ti-1100, to determine the mechanism of the creep-fatigue interaction. Based on pure creep crack growth results, the increase in the creep-fatigue crack growth rate is not amenable to separate contributions of creep crack growth and fatigue crack growth. A mechanism has been proposed to account for the increase in creep-fatigue crack growth rate that is based on the planar slip of titanium alloys which results in the formation of dislocation pileups at the prior beta grain boundaries and leads to intergranular fracture. This mechanism has been validated through crack growth experiments preformed on a Ti-1100 that has been microstructurally modified through the precipitation of internal slip barriers. These show that the intergranular fracture and increase in crack growth rate are absent.
引用
收藏
页码：397 / 410
页数：14
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